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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/api/basic_json/erase/" rel="canonical"><link href=../end_pos/ rel=prev><link href=../error_handler_t/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>erase - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#nlohmannbasic_jsonerase class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> erase </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" 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12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </laLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/api/basic_json/erase/" rel="canonical"><link href=../end_pos/ rel=prev><link href=../error_handler_t/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>erase - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#nlohmannbasic_jsonerase class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> erase </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </laLine truncated
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<span class=n>iterator</span><span class=w> </span><span class=nf>erase</span><span class=p>(</span><span class=n>iterator</span><span class=w> </span><span class=n>pos</span><span class=p>);</span>
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<span class=n>const_iterator</span><span class=w> </span><span class=nf>erase</span><span class=p>(</span><span class=n>const_iterator</span><span class=w> </span><span class=n>pos</span><span class=p>);</span>
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@@ -18,7 +18,7 @@
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</code></pre></div> <ol> <li> <p>Removes an element from a <abbr title="JavaScript Object Notation">JSON</abbr> value specified by iterator <code>pos</code>. The iterator <code>pos</code> must be valid and dereferenceable. Thus, the <code>end()</code> iterator (which is valid, but is not dereferenceable) cannot be used as a value for <code>pos</code>.</p> <p>If called on a primitive type other than <code class=highlight><span class=kc>null</span></code>, the resulting <abbr title="JavaScript Object Notation">JSON</abbr> value will be <code class=highlight><span class=kc>null</span></code>.</p> </li> <li> <p>Remove an element range specified by <code>[first; last)</code> from a <abbr title="JavaScript Object Notation">JSON</abbr> value. The iterator <code>first</code> does not need to be dereferenceable if <code>first == last</code>: erasing an empty range is a no-op.</p> <p>If called on a primitive type other than <code class=highlight><span class=kc>null</span></code>, the resulting <abbr title="JavaScript Object Notation">JSON</abbr> value will be <code class=highlight><span class=kc>null</span></code>.</p> </li> <li> <p>Removes an element from a <abbr title="JavaScript Object Notation">JSON</abbr> object by key.</p> </li> <li> <p>See 3. This overload is only available if <code>KeyType</code> is comparable with <code class=highlight><span class=k>typename</span><span class=w> </span><span class=nc>object_t</span><span class=o>::</span><span class=n>key_type</span></code> and <code class=highlight><span class=k>typename</span><span class=w> </span><span class=nc>object_comparator_t</span><span class=o>::</span><span class=n>is_transparent</span></code> denotes a type.</p> </li> <li> <p>Removes an element from a <abbr title="JavaScript Object Notation">JSON</abbr> array by index.</p> </li> </ol> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">¶</a></h2> <dl> <dt><code>KeyType</code></dt> <dd>A type for an object key other than <a href=../../json_pointer/ ><code>json_pointer</code></a> that is comparable with <a href=../string_t/ ><code>string_t</code></a> using <a href=../object_comparator_t/ ><code>object_comparator_t</code></a>. This can also be a string view (C++17).</dd> </dl> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">¶</a></h2> <dl> <dt><code>pos</code> (in)</dt> <dd>iterator to the element to remove</dd> <dt><code>first</code> (in)</dt> <dd>iterator to the beginning of the range to remove</dd> <dt><code>last</code> (in)</dt> <dd>iterator past the end of the range to remove</dd> <dt><code>key</code> (in)</dt> <dd>object key of the elements to remove</dd> <dt><code>idx</code> (in)</dt> <dd>array index of the element to remove</dd> </dl> <h2 id=return-value>Return value<a class=headerlink href=#return-value title="Permanent link">¶</a></h2> <ol> <li>Iterator following the last removed element. If the iterator <code>pos</code> refers to the last element, the <code>end()</code> iterator is returned.</li> <li>Iterator following the last removed element. If the iterator <code>last</code> refers to the last element, the <code>end()</code> iterator is returned.</li> <li>Number of elements removed. If <code>ObjectType</code> is the default <code>std::map</code> type, the return value will always be <code>0</code> (<code>key</code> was not found) or <code>1</code> (<code>key</code> was found).</li> <li>See 3.</li> <li>(none)</li> </ol> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">¶</a></h2> <p>Strong exception safety: if an exception occurs, the original value stays intact.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <ol> <li>The function can throw the following exceptions:<ul> <li>Throws <a href=../../../home/exceptions/#jsonexceptiontype_error307><code>type_error.307</code></a> if called on a <code>null</code> value; example: <code>"cannot use erase() with null"</code></li> <li>Throws <a href=../../../home/exceptions/#jsonexceptioninvalid_iterator202><code>invalid_iterator.202</code></a> if called on an iterator which does not belong to the current <abbr title="JavaScript Object Notation">JSON</abbr> value; example: <code>"iterator does not fit current value"</code></li> <li>Throws <a href=../../../home/exceptions/#jsonexceptioninvalid_iterator205><code>invalid_iterator.205</code></a> if called on a primitive type with invalid iterator (i.e., any iterator which is not <code>begin()</code>); example: <code>"iterator out of range"</code></li> </ul> </li> <li>The function can throw the following exceptions:<ul> <li>Throws <a href=../../../home/exceptions/#jsonexceptiontype_error307><code>type_error.307</code></a> if called on a <code>null</code> value; example: <code>"cannot use erase() with null"</code></li> <li>Throws <a href=../../../home/exceptions/#jsoneLine truncated
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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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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@@ -55,7 +55,7 @@
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</code></pre></div> </details> <details class=example> <summary>Example: (2) remove elements given an iterator range</summary> <p>The example shows the effect of <code>erase()</code> for different <abbr title="JavaScript Object Notation">JSON</abbr> types using an iterator range.</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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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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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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@@ -92,7 +92,7 @@
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</code></pre></div> </details> <details class=example> <summary>Example: (3) remove element from a <abbr title="JavaScript Object Notation">JSON</abbr> object given a key</summary> <p>The example shows the effect of <code>erase()</code> for different <abbr title="JavaScript Object Notation">JSON</abbr> types using an object key.</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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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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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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@@ -114,7 +114,7 @@
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
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<span class=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>std</span><span class=o>::</span><span class=nn>string_view_literals</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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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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@@ -134,7 +134,7 @@
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</code></pre></div> </details> <details class=example> <summary>Example: (5) remove element from a <abbr title="JavaScript Object Notation">JSON</abbr> array given an index</summary> <p>The example shows the effect of <code>erase()</code> using an array index.</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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||||
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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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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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@@ -113,7 +113,7 @@ The example shows the effect of `erase()` for different JSON types using an iter
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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using nlohmann::json;
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int main()
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{
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@@ -162,7 +162,7 @@ The example shows the effect of `erase()` for different JSON types using an iter
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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using nlohmann::json;
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int main()
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{
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@@ -211,7 +211,7 @@ The example shows the effect of `erase()` for different JSON types using an obje
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -245,7 +245,7 @@ The example shows the effect of `erase()` for different JSON types using an obje
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using namespace std::string_view_literals;
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -277,7 +277,7 @@ The example shows the effect of `erase()` using an array index.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
|
||||
Reference in new issue
Block a user