deploy: 94fe31eb9b

api/basic_json/operator_lt/index.html

@@ -1,4 +1,4 @@
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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/operator_lt/" rel="canonical"><link href=../operator_ne/ rel=prev><link href=../operator_gt/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>operator< - 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_jsonoperator 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> operator< </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 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 <span class=kt>bool</span><span class=w> </span><span class=k>operator</span><span class=o>&lt;</span><span class=p>(</span><span class=n>const_reference</span><span class=w> </span><span class=n>lhs</span><span class=p>,</span><span class=w> </span><span class=n>const_reference</span><span class=w> </span><span class=n>rhs</span><span class=p>)</span><span class=w> </span><span class=k>noexcept</span><span class=p>;</span><span class=w>   </span><span class=c1>// (1)</span>
 
 <span class=k>template</span><span class=o>&lt;</span><span class=k>typename</span><span class=w> </span><span class=nc>ScalarType</span><span class=o>&gt;</span>
@@ -9,7 +9,7 @@
 </code></pre></div> <ol> <li> <p>Compares whether one <abbr title="JavaScript Object Notation">JSON</abbr> value <code>lhs</code> is less than another <abbr title="JavaScript Object Notation">JSON</abbr> value <code>rhs</code> according to the following rules:</p> <ul> <li>If either operand is discarded, the comparison yields <code class=highlight><span class=nb>false</span></code>.</li> <li>If both operands have the same type, the values are compared using their respective <code>operator&lt;</code>.</li> <li>Integer and floating-point numbers are compared by their exact values, without converting the integer to floating-point. For instance, <code>9007199254740992.0</code> is less than <code>9007199254740993</code>.</li> <li>In case <code>lhs</code> and <code>rhs</code> have different types, the values are ignored and the order of the types is considered, which is:<ol> <li>null</li> <li>boolean</li> <li>number (all types)</li> <li>object</li> <li>array</li> <li>string</li> <li>binary For instance, any boolean value is considered less than any string.</li> </ol> </li> </ul> </li> <li> <p>Compares whether a <abbr title="JavaScript Object Notation">JSON</abbr> value is less than a scalar or a scalar is less than a <abbr title="JavaScript Object Notation">JSON</abbr> value by converting the scalar to a <abbr title="JavaScript Object Notation">JSON</abbr> value and comparing both <abbr title="JavaScript Object Notation">JSON</abbr> values according to 1.</p> </li> </ol> <h2 id=template-parameters>Template parameters<a class=headerlink href=#template-parameters title="Permanent link">&para;</a></h2> <dl> <dt><code>ScalarType</code></dt> <dd>a scalar type according to <code>std::is_scalar&lt;ScalarType&gt;::value</code></dd> </dl> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">&para;</a></h2> <dl> <dt><code>lhs</code> (in)</dt> <dd>first value to consider </dd> <dt><code>rhs</code> (in)</dt> <dd>second value to consider </dd> </dl> <h2 id=return-value>Return value<a class=headerlink href=#return-value title="Permanent link">&para;</a></h2> <p>whether <code>lhs</code> is less than <code>rhs</code></p> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">&para;</a></h2> <ol> <li>No-throw guarantee: this function never throws exceptions.</li> <li>No-throw guarantee if converting the scalar to a <abbr title="JavaScript Object Notation">JSON</abbr> value cannot throw, as for numbers, Booleans, and <code class=highlight><span class=nb>nullptr</span></code>; the function is <code class=highlight><span class=k>noexcept</span></code> exactly in that case. Otherwise, it throws what the conversion throws, for example <code>std::bad_alloc</code> when converting a string, or <a href=../../../home/exceptions/#jsonexceptionout_of_range410><code>out_of_range.410</code></a> for an enum value not mapped by <a href=../../macros/nlohmann_json_serialize_enum_strict/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM_STRICT</code></a>.</li> </ol> <h2 id=complexity>Complexity<a class=headerlink href=#complexity title="Permanent link">&para;</a></h2> <p>Linear.</p> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">&para;</a></h2> <div class="admonition note"> <p class=admonition-title>Comparing <code>NaN</code></p> <p><code>NaN</code> values are unordered within the domain of numbers. The following comparisons all yield <code class=highlight><span class=nb>false</span></code>: 1. Comparing a <code>NaN</code> with itself. 2. Comparing a <code>NaN</code> with another <code>NaN</code>. 3. Comparing a <code>NaN</code> and any other number.</p> </div> <div class="admonition note"> <p class=admonition-title>Operator overload resolution</p> <p>Since C++20 overload resolution will consider the <em>rewritten candidate</em> generated from <a href=../operator_spaceship/ ><code>operator&lt;=&gt;</code></a>.</p> </div> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">&para;</a></h2> <details class=example> <summary>Example</summary> <p>The example demonstrates comparing several <abbr title="JavaScript Object Notation">JSON</abbr> types.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span>
 <span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span>
 
-<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>
+<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>
 
 <span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
 <span class=p>{</span>

api/basic_json/operator_lt/index.md

@@ -74,7 +74,7 @@ The example demonstrates comparing several JSON types.
 #include <iostream>
 #include <nlohmann/json.hpp>
 
-using json = nlohmann::json;
+using nlohmann::json;
 
 int main()
 {