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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/macros/json_diagnostic_positions/" rel="canonical"><link href=../json_delete_deprecated_functions/ rel=prev><link href=../json_disable_enum_serialization/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>JSON_DIAGNOSTIC_POSITIONS - 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 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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/macros/json_diagnostic_positions/" rel="canonical"><link href=../json_delete_deprecated_functions/ rel=prev><link href=../json_disable_enum_serialization/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>JSON_DIAGNOSTIC_POSITIONS - 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 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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> JSON_DIAGNOSTIC_POSITIONS </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 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</code></pre></div> <p>This macro enables position diagnostics for generated <abbr title="JavaScript Object Notation">JSON</abbr> objects.</p> <p>When enabled, two new member functions <a href=../../basic_json/start_pos/ ><code>start_pos()</code></a> and <a href=../../basic_json/end_pos/ ><code>end_pos()</code></a> are added to <a href=../../basic_json/ ><code>basic_json</code></a> values. If the value was created by calling the<a href=../../basic_json/parse/ ><code>parse</code></a> function, then these functions allow querying the byte positions of the value in the input it was parsed from. In case the value was constructed by other means, <code>std::string::npos</code> is returned.</p> <p><a href=../../basic_json/start_pos/ ><code>start_pos()</code></a> returns the position of the first character of a given value in the original <abbr title="JavaScript Object Notation">JSON</abbr> string, while <a href=../../basic_json/end_pos/ ><code>end_pos()</code></a> returns the position of the character <em>following</em> the last character. For objects and arrays, the first and last characters correspond to the opening or closing braces/brackets, respectively. For primitive values, the first and last character represents the opening and closing quotes (strings) or the first and last character of the field's numerical or predefined value (<code>true</code>, <code>false</code>, <code>null</code>), respectively.</p> <table> <thead> <tr> <th><abbr title="JavaScript Object Notation">JSON</abbr> type</th> <th>return value <a href=../../basic_json/start_pos/ ><code>start_pos()</code></a></th> <th>return value <a href=../../basic_json/end_pos/ ><code>end_pos()</code></a></th> </tr> </thead> <tbody> <tr> <td>object</td> <td>position of the opening <code>{</code></td> <td>position after the closing <code>}</code></td> </tr> <tr> <td>array</td> <td>position of the opening <code>[</code></td> <td>position after the closing <code>]</code></td> </tr> <tr> <td>string</td> <td>position of the opening <code>"</code></td> <td>position after the closing <code>"</code></td> </tr> <tr> <td>number</td> <td>position of the first character</td> <td>position after the last character</td> </tr> <tr> <td>boolean</td> <td>position of <code>t</code> for <code>true</code> and <code>f</code> for <code>false</code></td> <td>position after <code>e</code></td> </tr> <tr> <td>null</td> <td>position of <code>n</code></td> <td>position after <code>l</code></td> </tr> </tbody> </table> <p>Given the above, <a href=../../basic_json/end_pos/ ><code>end_pos()</code></a><code>-</code><a href=../../basic_json/start_pos/ ><code>start_pos()</code></a> for a <abbr title="JavaScript Object Notation">JSON</abbr> value provides the length of the parsed <abbr title="JavaScript Object Notation">JSON</abbr> string for that value, including the opening or closing braces, brackets, or quotes.</p> <p>Note that enabling this macro increases the size of every <abbr title="JavaScript Object Notation">JSON</abbr> value by two <code>std::size_t</code> fields and adds slight runtime overhead to parsing, copying <abbr title="JavaScript Object Notation">JSON</abbr> value objects, and the generation of error messages for exceptions. It also causes these values to be reported in those error messages.</p> <h2 id=default-definition>Default definition<a class=headerlink href=#default-definition title="Permanent link">¶</a></h2> <p>The default value is <code>0</code> (position diagnostics are switched off).</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_DIAGNOSTIC_POSITIONS 0</span>
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</code></pre></div> <p>When the macro is not defined, the library will define it to its default value.</p> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">¶</a></h2> <div class="admonition note"> <p class=admonition-title>CMake option</p> <p>Diagnostic positions can also be controlled with the CMake option <a href=../../../integration/cmake/#json_diagnostic_positions><code>JSON_Diagnostic_Positions</code></a> (<code>OFF</code> by default) which defines <code>JSON_DIAGNOSTIC_POSITIONS</code> accordingly.</p> </div> <div class="admonition note"> <p class=admonition-title>Availability</p> <p>Diagnostic positions are only available if the value was created by the <a href=../../basic_json/parse/ ><code>parse</code></a> function. The <a href=../../basic_json/sax_parse/ ><code>sax_parse</code></a> function or all other means to create a <abbr title="JavaScript Object Notation">JSON</abbr> value <strong>do not</strong> set the diagnostic positions and <a href=../../basic_json/start_pos/ ><code>start_pos()</code></a> and <a href=../../basic_json/end_pos/ ><code>end_pos()</code></a> will only return <code>std::string::npos</code> for these values.</p> </div> <div class="admonition warning"> <p class=admonition-title>Invalidation</p> <p>The returned positions are only valid as long as the <abbr title="JavaScript Object Notation">JSON</abbr> value is not changed. The positions are <em>not</em> updated when the <abbr title="JavaScript Object Notation">JSON</abbr> value is changed.</p> </div> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">¶</a></h2> <details class=example> <summary>Example: retrieving positions</summary> <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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