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@@ -26,19 +26,19 @@
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<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>,</span><span class=w> </span><span class=mi>3</span><span class=p>,</span><span class=w> </span><span class=mi>4</span><span class=p>,</span><span class=w> </span><span class=mi>5</span><span class=p>};</span>
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<span class=w> </span><span class=c1>// output element at index 3 (fourth element)</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=p>[</span><span class=mi>3</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=p>[</span><span class=mi>3</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// change last element to 6</span>
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<span class=w> </span><span class=n>array</span><span class=p>[</span><span class=n>array</span><span class=p>.</span><span class=n>size</span><span class=p>()</span><span class=w> </span><span class=o>-</span><span class=w> </span><span class=mi>1</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>6</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output changed array</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// write beyond array limit</span>
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<span class=w> </span><span class=n>array</span><span class=p>[</span><span class=mi>10</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>11</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output changed array</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=p>}</span>
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</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>4</span>
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<span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>,</span><span class=mi>4</span><span class=p>,</span><span class=mi>6</span><span class=p>]</span>
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@@ -51,12 +51,12 @@
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<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
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<span class=p>{</span>
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<span class=w> </span><span class=c1>// create JSON array</span>
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<span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=s>"first"</span><span class=p>,</span><span class=w> </span><span class=s>"2nd"</span><span class=p>,</span><span class=w> </span><span class=s>"third"</span><span class=p>,</span><span class=w> </span><span class=s>"fourth"</span><span class=p>};</span>
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<span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=s>"first"</span><span class=p>,</span><span class=w> </span><span class=s>"2nd"</span><span class=p>,</span><span class=w> </span><span class=s>"third"</span><span class=p>,</span><span class=w> </span><span class=s>"fourth"</span><span class=p>};</span>
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<span class=w> </span><span class=c1>// output element at index 2 (third element)</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=p>.</span><span class=n>at</span><span class=p>(</span><span class=mi>2</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>array</span><span class=p>.</span><span class=n>at</span><span class=p>(</span><span class=mi>2</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=p>}</span>
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</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=s2>"third"</span>
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</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=s2>"third"</span>
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</code></pre></div> </details> <details class=example> <summary>Example: (2) access specified object element</summary> <p>The example below shows how object elements can be read and written using the <code>[]</code> operator.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><iomanip></span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
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@@ -68,45 +68,45 @@
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<span class=w> </span><span class=c1>// create a JSON object</span>
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<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span>
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<span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
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<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
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<span class=w> </span><span class=p>};</span>
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<span class=w> </span><span class=c1>// output element with key "two"</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output element with key "two"</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// change element with key "three"</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"three"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>3</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// change element with key "three"</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"three"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>3</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output changed array</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// mention nonexisting key</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"four"</span><span class=p>];</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"four"</span><span class=p>];</span>
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<span class=w> </span><span class=c1>// write to nonexisting key</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"five"</span><span class=p>][</span><span class=s>"really"</span><span class=p>][</span><span class=s>"nested"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
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<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"five"</span><span class=p>][</span><span class=s>"really"</span><span class=p>][</span><span class=s>"nested"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output changed object</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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<span class=p>}</span>
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</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>2</span>
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<span class=p>{</span>
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<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
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<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
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<span class=p>}</span>
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<span class=p>{</span>
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<span class=w> </span><span class=nt>"five"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=nt>"really"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=nt>"nested"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span>
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<span class=w> </span><span class=nt>"five"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=nt>"really"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
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<span class=w> </span><span class=nt>"nested"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span>
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<span class=w> </span><span class=p>}</span>
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<span class=w> </span><span class=p>},</span>
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<span class=w> </span><span class=nt>"four"</span><span class=p>:</span><span class=w> </span><span class=kc>null</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
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<span class=w> </span><span class=nt>"four"</span><span class=p>:</span><span class=w> </span><span class=kc>null</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
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<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
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<span class=p>}</span>
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</code></pre></div> </details> <details class=example> <summary>Example: (2) access specified object element (const)</summary> <p>The example below shows how object elements can be read using the <code>[]</code> operator.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
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@@ -118,11 +118,11 @@
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<span class=w> </span><span class=c1>// create a JSON object</span>
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<span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span>
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<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
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||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
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<span class=w> </span><span class=p>};</span>
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||||
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||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
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||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
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||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
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||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>2</span>
|
||||
</code></pre></div> </details> <details class=example> <summary>Example: (3) access specified object element using string_view</summary> <p>The example below shows how object elements can be read using the <code>[]</code> operator.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
@@ -138,45 +138,45 @@
|
||||
<span class=w> </span><span class=c1>// create a JSON object</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
|
||||
<span class=w> </span><span class=p>};</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// change element with key "three"</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"three"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>3</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// change element with key "three"</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"three"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>3</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output changed array</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"</span><span class=se>\n\n</span><span class=s>"</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// mention nonexisting key</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"four"</span><span class=n>sv</span><span class=p>];</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"four"</span><span class=n>sv</span><span class=p>];</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// write to nonexisting key</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"five"</span><span class=n>sv</span><span class=p>][</span><span class=s>"really"</span><span class=n>sv</span><span class=p>][</span><span class=s>"nested"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"five"</span><span class=n>sv</span><span class=p>][</span><span class=s>"really"</span><span class=n>sv</span><span class=p>][</span><span class=s>"nested"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output changed object</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>2</span>
|
||||
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
|
||||
<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
|
||||
<span class=p>}</span>
|
||||
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"five"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"really"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"nested"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span>
|
||||
<span class=w> </span><span class=nt>"five"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"really"</span><span class=p>:</span><span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"nested"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=p>},</span>
|
||||
<span class=w> </span><span class=nt>"four"</span><span class=p>:</span><span class=w> </span><span class=kc>null</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
|
||||
<span class=w> </span><span class=nt>"four"</span><span class=p>:</span><span class=w> </span><span class=kc>null</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"one"</span><span class=p>:</span><span class=w> </span><span class=mi>1</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"three"</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"two"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </details> <details class=example> <summary>Example: (3) access specified object element using string_view (const)</summary> <p>The example below shows how object elements can be read using the <code>[]</code> operator.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><string_view></span>
|
||||
@@ -190,11 +190,11 @@
|
||||
<span class=w> </span><span class=c1>// create a JSON object</span>
|
||||
<span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"three"</span><span class=p>,</span><span class=w> </span><span class=mf>2.9</span><span class=p>}</span>
|
||||
<span class=w> </span><span class=p>};</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with key "two"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>object</span><span class=p>[</span><span class=s>"two"</span><span class=n>sv</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>2</span>
|
||||
</code></pre></div> </details> <details class=example> <summary>Example: (4) access specified element via <abbr title="JavaScript Object Notation">JSON</abbr> Pointer</summary> <p>The example below shows how values can be read and written using <abbr title="JavaScript Object Notation">JSON</abbr> Pointers.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
@@ -208,50 +208,50 @@
|
||||
<span class=w> </span><span class=c1>// create a JSON value</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"number"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"string"</span><span class=p>,</span><span class=w> </span><span class=s>"foo"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"array"</span><span class=p>,</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}}</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"number"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"string"</span><span class=p>,</span><span class=w> </span><span class=s>"foo"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"array"</span><span class=p>,</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}}</span>
|
||||
<span class=w> </span><span class=p>};</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// read-only access</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/number"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/number"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/string"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array/1"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/number"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/number"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/string"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array/1"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// writing access</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// change the string</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"bar"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"bar"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output the changed string</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"string"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"string"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// "change" a nonexisting object entry</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/boolean"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// "change" a nonexisting object entry</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/boolean"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>true</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output the changed object</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// change an array element</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>21</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// "change" an array element with nonexisting index</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/4"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>44</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>21</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// "change" an array element with nonexisting index</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/4"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>44</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output the changed array</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"array"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"array"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// "change" the array element past the end</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/-"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>55</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// "change" the array element past the end</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/-"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>55</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output the changed array</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"array"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"array"</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>1</span>
|
||||
<span class=s2>"foo"</span>
|
||||
<span class=s2>"foo"</span>
|
||||
<span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>]</span>
|
||||
<span class=mi>2</span>
|
||||
<span class=s2>"bar"</span>
|
||||
<span class=p>{</span><span class=nt>"array"</span><span class=p>:[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>],</span><span class=nt>"boolean"</span><span class=p>:</span><span class=kc>true</span><span class=p>,</span><span class=nt>"number"</span><span class=p>:</span><span class=mi>1</span><span class=p>,</span><span class=nt>"string"</span><span class=p>:</span><span class=s2>"bar"</span><span class=p>}</span>
|
||||
<span class=s2>"bar"</span>
|
||||
<span class=p>{</span><span class=nt>"array"</span><span class=p>:[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>],</span><span class=nt>"boolean"</span><span class=p>:</span><span class=kc>true</span><span class=p>,</span><span class=nt>"number"</span><span class=p>:</span><span class=mi>1</span><span class=p>,</span><span class=nt>"string"</span><span class=p>:</span><span class=s2>"bar"</span><span class=p>}</span>
|
||||
<span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>21</span><span class=p>,</span><span class=kc>null</span><span class=p>,</span><span class=kc>null</span><span class=p>,</span><span class=mi>44</span><span class=p>]</span>
|
||||
<span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>21</span><span class=p>,</span><span class=kc>null</span><span class=p>,</span><span class=kc>null</span><span class=p>,</span><span class=mi>44</span><span class=p>,</span><span class=mi>55</span><span class=p>]</span>
|
||||
</code></pre></div> </details> <details class=example> <summary>Example: (4) access specified element via <abbr title="JavaScript Object Notation">JSON</abbr> Pointer (const)</summary> <p>The example below shows how values can be read using <abbr title="JavaScript Object Notation">JSON</abbr> Pointers.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
@@ -265,22 +265,22 @@
|
||||
<span class=w> </span><span class=c1>// create a JSON value</span>
|
||||
<span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"number"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"string"</span><span class=p>,</span><span class=w> </span><span class=s>"foo"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"array"</span><span class=p>,</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}}</span>
|
||||
<span class=w> </span><span class=p>{</span><span class=s>"number"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"string"</span><span class=p>,</span><span class=w> </span><span class=s>"foo"</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"array"</span><span class=p>,</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}}</span>
|
||||
<span class=w> </span><span class=p>};</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// read-only access</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/number"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/number"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/string"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array/1"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/number"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/number"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/string"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/string"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=c1>// output element with JSON pointer "/array/1"</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"/array/1"</span><span class=n>_json_pointer</span><span class=p>]</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=mi>1</span>
|
||||
<span class=s2>"foo"</span>
|
||||
<span class=s2>"foo"</span>
|
||||
<span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>]</span>
|
||||
<span class=mi>2</span>
|
||||
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li>documentation on <a href=../../../features/element_access/unchecked_access/ >unchecked access</a></li> <li>documentation on <a href=../../../features/assertions/ >runtime assertions</a></li> <li>see <a href=../at/ ><code>at</code></a> for access by reference with range checking</li> <li>see <a href=../value/ ><code>value</code></a> for access with default value</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ol> <li>Added in version 1.0.0.</li> <li>Added in version 1.0.0. Added overloads for <code>T* key</code> in version 1.1.0. Removed overloads for <code>T* key</code> (replaced by 3) in version 3.11.0.</li> <li>Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept <code>std::string_view</code>-convertible keys, as already supported by <a href=../at/ ><code>at</code></a>, <a href=../value/ ><code>value</code></a>, <a href=../find/ ><code>find</code></a>, and other lookup functions.</li> <li>Added in version 2.0.0.</li> </ol> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="August 7, 2026 17:29:58 UTC">August 7, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1Line truncated
|
||||
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li>documentation on <a href=../../../features/element_access/unchecked_access/ >unchecked access</a></li> <li>documentation on <a href=../../../features/assertions/ >runtime assertions</a></li> <li>see <a href=../at/ ><code>at</code></a> for access by reference with range checking</li> <li>see <a href=../value/ ><code>value</code></a> for access with default value</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ol> <li>Added in version 1.0.0.</li> <li>Added in version 1.0.0. Added overloads for <code>T* key</code> in version 1.1.0. Removed overloads for <code>T* key</code> (replaced by 3) in version 3.11.0.</li> <li>Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept <code>std::string_view</code>-convertible keys, as already supported by <a href=../at/ ><code>at</code></a>, <a href=../value/ ><code>value</code></a>, <a href=../find/ ><code>find</code></a>, and other lookup functions.</li> <li>Added in version 2.0.0.</li> </ol> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="August 19, 2026 18:19:47 UTC">August 19, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1Line truncated
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