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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/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.6.18"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.7e37652d.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.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/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.6.20"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.e53b48f4.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.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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<span class=n>value_t</span><span class=w> </span><span class=n>m_type</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>value_t</span><span class=o>::</span><span class=n>null</span><span class=p>;</span>
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<span class=c1>/// the value of the current element</span>
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<span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
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<span class=kt>void</span><span class=w> </span><span class=n>from_json</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_json</span><span class=o>&</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=n>T</span><span class=o>&</span><span class=w> </span><span class=n>t</span><span class=p>);</span>
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</code></pre></div> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</li> <li>Binary formats</li> <li>Custom base class</li> <li>Conversion macros</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <ul> <li>C++ feature backports</li> </ul> <!-- 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 28, 2025 14:21:01 UTC">August 28, 2025</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 © 2013-2025 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 7.0.0 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 fill=currentColor 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 7.0.0 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 fill=currentColor d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.0.0 by @foLine truncated
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</code></pre></div> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</li> <li>Binary formats</li> <li>Custom base class</li> <li>Conversion macros</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <ul> <li>C++ feature backports</li> </ul> <!-- 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="September 15, 2025 18:19:32 UTC">September 15, 2025</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 © 2013-2025 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 7.0.0 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 7.0.0 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="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.0.0 by @fontawesome - https://fontawesomLine truncated
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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> </label> <div class=md-seaLine truncated
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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> </label> <div class=md-seaLine truncated
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@@ -1,4 +1,4 @@
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direction LR
|
||||
class `std::exception` {
|
||||
<<interface>>
|
||||
@@ -281,4 +281,4 @@ exception id: 401
|
||||
exception id: 501
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionother_error501>json.exception.other_error.501<a class=headerlink href=#jsonexceptionother_error501 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch operation 'test' failed. The unsuccessful operation is also printed.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Executing <code class=highlight><span class=p>{</span><span class=nt>"op"</span><span class=p>:</span><span class=s2>"test"</span><span class=p>,</span><span class=w> </span><span class=nt>"path"</span><span class=p>:</span><span class=s2>"/baz"</span><span class=p>,</span><span class=w> </span><span class=nt>"value"</span><span class=p>:</span><span class=s2>"bar"</span><span class=p>}</span></code> on <code class=highlight><span class=p>{</span><span class=nt>"baz"</span><span class=p>:</span><span class=w> </span><span class=s2>"qux"</span><span class=p>}</span></code>:</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.501] unsuccessful: {"op":"test","path":"/baz","value":"bar"}
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionother_error502>json.exception.other_error.502<a class=headerlink href=#jsonexceptionother_error502 title="Permanent link">¶</a></h3> <p>This exception is thrown when a null pointer is passed as <abbr title="Simple API for XML">SAX</abbr> event listener to the <a href=../../api/basic_json/sax_parse/ >sax_parse</a> function.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.502] SAX handler must not be null
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</code></pre></div> <p>and</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=nf>j</span><span class=p>(</span><span class=nb>true</span><span class=p>);</span>
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</code></pre></div> <p>yield different results (<code class=highlight><span class=p>[</span><span class=kc>true</span><span class=p>]</span></code> vs. <code class=highlight><span class=kc>true</span></code>)?</p> </div> <p>This is a known issue, and -- even worse -- the behavior differs between <abbr title="GNU Compiler Collection">GCC</abbr> and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like</p> <div class=highlight><pre><span></span><code><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>
|
||||
</code></pre></div> <p>for arrays and</p> <div class=highlight><pre><span></span><code><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=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>
|
||||
@@ -26,4 +26,4 @@
|
||||
</code></pre></div> </div> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <h3 id=parsing-without-exceptions>Parsing without exceptions<a class=headerlink href=#parsing-without-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is it possible to indicate a parse error without throwing an exception?</p> </div> <p>Yes, see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a>.</p> <h3 id=key-name-in-exceptions>Key name in exceptions<a class=headerlink href=#key-name-in-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can I get the key of the object item that caused an exception?</p> </div> <p>Yes, you can. Please define the symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to get <a href=../exceptions/#extended-diagnostic-messages>extended diagnostics messages</a>.</p> <h2 id=serialization-issues>Serialization issues<a class=headerlink href=#serialization-issues title="Permanent link">¶</a></h2> <h3 id=number-precision>Number precision<a class=headerlink href=#number-precision title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>It seems that precision is lost when serializing a double.</li> <li>Can I change the precision for floating-point serialization?</li> </ul> </div> <p>The library uses <code>std::numeric_limits<number_float_t>::digits10</code> (15 for <abbr title="Institute of Electrical and Electronics Engineers">IEEE</abbr> <code>double</code>s) digits for serialization. This value is sufficient to guarantee roundtripping. If one uses more than this number of digits of precision, then string -> value -> string is not guaranteed to round-trip.</p> <div class="admonition quote"> <p class=admonition-title><a href="https://en.cppreference.com/w/cpp/types/numeric_limits/digits10">cppreference.com</a></p> <p>The value of <code>std::numeric_limits<T>::digits10</code> is the number of base-10 digits that can be represented by the type T without change, that is, any number with this many significant decimal digits can be converted to a value of type T and back to decimal form, without change due to rounding or overflow. </p> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <p>The website <a href="https://float.exposed">https://float.exposed</a> gives a good insight into the internal storage of floating-point numbers.</p> </div> <p>See <a href=../../features/types/number_handling/#number-serialization>this section</a> on the library's number handling for more information.</p> <h2 id=compilation-issues>Compilation issues<a class=headerlink href=#compilation-issues title="Permanent link">¶</a></h2> <h3 id=android-sdk>Android <abbr title="Software Development Kit">SDK</abbr><a class=headerlink href=#android-sdk title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why does the code not compile with Android <abbr title="Software Development Kit">SDK</abbr>?</p> </div> <p>Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your <code>Application.mk</code>. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.</p> <div class=highlight><pre><span></span><code><span class=na>APP_STL</span><span class=w> </span><span class=o>:</span><span class=s>= c++_shared</span>
|
||||
<span class=na>NDK_TOOLCHAIN_VERSION</span><span class=w> </span><span class=o>:</span><span class=s>= clang3.6</span>
|
||||
<span class=na>APP_CPPFLAGS +</span><span class=o>=</span><span class=w> </span><span class=s>-frtti -fexceptions</span>
|
||||
</code></pre></div> <p>The code compiles successfully with <a href="https://developer.android.com/ndk/index.html?hl=ml">Android <abbr title="Native Development Kit">NDK</abbr></a>, Revision 9 - 11 (and possibly later) and <a href="https://www.crystax.net/en/android/ndk">CrystaX's Android <abbr title="Native Development Kit">NDK</abbr></a> version 10.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with MinGW or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug. For Android <abbr title="Native Development Kit">NDK</abbr> using <code>APP_STL := gnustl_static</code>, please refer to <a href="https://github.com/nlohmann/json/issues/219">this discussion</a>.</p> <!-- 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 28, 2025 14:21:01 UTC">August 28, 2025</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 © 2013-2025 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 7.0.0 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 fill=currentColor 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" rLine truncated
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</code></pre></div> <p>The code compiles successfully with <a href="https://developer.android.com/ndk/index.html?hl=ml">Android <abbr title="Native Development Kit">NDK</abbr></a>, Revision 9 - 11 (and possibly later) and <a href="https://www.crystax.net/en/android/ndk">CrystaX's Android <abbr title="Native Development Kit">NDK</abbr></a> version 10.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with MinGW or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug. For Android <abbr title="Native Development Kit">NDK</abbr> using <code>APP_STL := gnustl_static</code>, please refer to <a href="https://github.com/nlohmann/json/issues/219">this discussion</a>.</p> <!-- 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="September 15, 2025 18:19:32 UTC">September 15, 2025</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 © 2013-2025 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 7.0.0 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="noopenerLine 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/home/releases/" rel="canonical"><link href=../exceptions/ rel=prev><link href=../design_goals/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.6.20"><title>Releases - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.e53b48f4.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.06af60db.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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<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>key</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>':'</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>val</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> #1388 #1391</p> </li> <li> <p>Added support for <strong>reading from <code>FILE*</code></strong> to support situations in which streams are nit available or would require too much RAM. #1370 #1392</p> </li> </ul> <h3 id=bug-fixes_6><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Bug Fixes<a class=headerlink href=#bug-fixes_6 title="Permanent link">¶</a></h3> <ul> <li>The <code>eofbit</code> was not set for input streams when the end of a stream was reached while parsing. #1340 #1343</li> <li>Fixed a bug in the <abbr title="Simple API for XML">SAX</abbr> parser for <abbr title="Binary JSON">BSON</abbr> arrays.</li> </ul> <h3 id=improvements_3><img alt="⚡" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/26a1.svg" title=":zap:"> Improvements<a class=headerlink href=#improvements_3 title="Permanent link">¶</a></h3> <ul> <li>Added support for Clang 5.0.1 (PS4 version). #1341 #1342</li> </ul> <h3 id=further-changes_5><img alt="🔨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f528.svg" title=":hammer:"> Further Changes<a class=headerlink href=#further-changes_5 title="Permanent link">¶</a></h3> <ul> <li>Added a warning for implicit conversions to the documentation: It is not recommended to use implicit conversions when reading <strong>from</strong> a <abbr title="JavaScript Object Notation">JSON</abbr> value. Details about this recommendation can be found <a href="https://www.github.com/nlohmann/json/issues/958">here</a>. #1363</li> <li>Fixed typos in the documentation. #1329 #1380 #1382</li> <li>Fixed a C4800 warning. #1364</li> <li>Fixed a <code>-Wshadow</code> warning #1346</li> <li>Wrapped <code>std::snprintf</code> calls to avoid error in <abbr title="Microsoft Visual C++">MSVC</abbr>. #1337</li> <li>Added code to allow installation via Meson. #1345</li> </ul> <h3 id=deprecated-functions_6><img alt="🔥" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f525.svg" title=":fire:"> Deprecated functions<a class=headerlink href=#deprecated-functions_6 title="Permanent link">¶</a></h3> <p>This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):</p> <ul> <li>Function <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_af1592a06bc63811886ade4f9d965045e.html#af1592a06bc63811886ade4f9d965045e"><code>iterator_wrapper</code></a> are deprecated. Please use the member function <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_afe3e137ace692efa08590d8df40f58dd.html#afe3e137ace692efa08590d8df40f58dd"><code>items()</code></a> instead.</li> <li>Functions <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_ab7285a92514fcdbe6de505ebaba92ea3.html#ab7285a92514fcdbe6de505ebaba92ea3"><code>friend std::istream& operator<<(basic_json&, std::istream&)</code></a> and <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_a9e06deabe69262c3ffc5533d32856983.html#a9e06deabe69262c3ffc5533d32856983"><code>friend std::ostream& operator>>(const basic_json&, std::ostream&)</code></a> are deprecated. Please use <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_aaf363408931d76472ded14017e59c9e8.html#aaf363408931d76472ded14017e59c9e8"><code>friend std::istream& operator>>(std::istream&, basic_json&)</code></a> and <a href="http://nlohmann.github.io/json/doxygen/classnlohmann_1_1basic__json_a5e34c5435e557d0bf666bd7311211405.html#a5e34c5435e557d0bf666bd7311211405"><code>friend operator<<(std::ostream&, const basic_json&)</code></a> instead.</li> </ul> <h2 id=v340>v3.4.0<a class=headerlink href=#v340 title="Permanent link">¶</a></h2> <div class="admonition summary"> <p class=admonition-title>Files</p> <ul> <li><a href="https://github.com/nlohmann/json/releases/download/v3.4.0/include.zip">include.zip</a> (132 KB)</li> <li><a href="https://github.com/nlohmann/json/releases/download/v3.4.0/include.zip.asc">include.zip.asc</a> (1 KB)</li> <li><a href="https://github.com/nlohmann/json/releases/download/v3.4.0/json.hpp">json.hpp</a> (689 KB)</li> <li><a href="https://github.com/nlohmann/json/releases/download/v3.4.0/json.hpp.asc">json.hpp.asc</a> (1 KB)</li> </ul> </div> <p>Release date: 2018-10-30 <abbr title="Secure Hash Algorithm">SHA</abbr>-256: 63da6d1f22b2a7bb9e4ff7d6b255cf691a161ff49532dcc45d398a53e295835f (json.hpp), bfec46fc0cee01c509cf064d2254517e7fa80d1e7647fea37cf81d97c5682bdc (include.zip)</p> <h3 id=summary_7>Summary<a class=headerlink href=#summary_7 title="Permanent link">¶</a></h3> <p>This release introduces three new features:<Line truncated
|
||||
@@ -7,4 +7,4 @@
|
||||
<span class=n>j</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>ss</span><span class=p>;</span>
|
||||
</code></pre></div> <p>or</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>;</span>
|
||||
<span class=n>ss</span><span class=w> </span><span class=o>>></span><span class=w> </span><span class=n>j</span><span class=p>;</span>
|
||||
</code></pre></div> <h2 id=v211>v2.1.1<a class=headerlink href=#v211 title="Permanent link">¶</a></h2> <div class="admonition summary"> <p class=admonition-title>Files</p> <ul> <li><a href="https://github.com/nlohmann/json/releases/download/v2.1.1/json.hpp">json.hpp</a> (437 KB)</li> <li><a href="https://github.com/nlohmann/json/releases/download/v2.1.1/json.hpp.asc">json.hpp.asc</a> (1 KB)</li> </ul> </div> <p>Release date: 2017-02-25 <abbr title="Secure Hash Algorithm">SHA</abbr>-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57</p> <h3 id=summary_15>Summary<a class=headerlink href=#summary_15 title="Permanent link">¶</a></h3> <p>This release <strong>fixes a locale-related bug in the parser</strong>. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.</p> <h3 id=changes_1>Changes<a class=headerlink href=#changes_1 title="Permanent link">¶</a></h3> <ul> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Locales that have a different character than <code>.</code> as decimal separator (e.g., the Norwegian locale <code>nb_NO.UTF-8</code>) led to truncated number parsing or parse errors. The library now has been fixed to work with <strong>any locale</strong>. Note that <code>.</code> is still the only valid decimal separator for <abbr title="JavaScript Object Notation">JSON</abbr> input.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Numbers like <code>1.0</code> were correctly parsed as floating-point number, but serialized as integer (<code>1</code>). Now, <strong>floating-point numbers correctly round trip</strong>.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Parsing incorrect <abbr title="JavaScript Object Notation">JSON</abbr> numbers with leading 0 (<code>0123</code>) could yield a <a href="https://github.com/nlohmann/json/issues/452">buffer overflow</a>. This is fixed now by detecting such errors directly by the lexer.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Constructing a <abbr title="JavaScript Object Notation">JSON</abbr> value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Comparing a <abbr title="JavaScript Object Notation">JSON</abbr> number with <code>0</code> led to a comparison with <code>null</code>. This is fixed now.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> All throw calls are now wrapped in macros.</li> <li><img alt="🔒" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f512.svg" title=":lock:"> Starting during the preparation of this release (since 8 February 2017), commits and released files are <strong>cryptographically signed</strong> with <a href="https://keybase.io/nlohmann/pgp_keys.asc?fingerprint=797167ae41c0a6d9232e48457f3cea63ae251b69">this GPG key</a>. Previous releases have also been signed.</li> <li><img alt="✨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/2728.svg" title=":sparkles:"> The parser for MessagePack and <abbr title="Concise Binary Object Representation">CBOR</abbr> now supports an optional start index parameter to define a byte offset for the parser.</li> <li><img alt="🚨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f6a8.svg" title=":rotating_light:"> Some more warnings have been fixed. With Clang, the code compiles <strong>without warnings</strong> with <code>-Weverything</code> (well, it needs <code>-Wno-documentation-unknown-command</code> and <code>-Wno-deprecated-declarations</code>, but you get the point).</li> <li><img alt="🔨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f528.svg" title=":hammer:"> The code can be compiled easier with many Android NDKs by avoiding macros like <code>UINT8_MAX</code> which previously required defining a preprocessor macro for compilation.</li> <li><img alt="⚡" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/26a1.svg" title=":zap:"> The unit tests now compile two times faster.</li> <li><img alt="➕" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdeckedLine truncated
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</code></pre></div> <h2 id=v211>v2.1.1<a class=headerlink href=#v211 title="Permanent link">¶</a></h2> <div class="admonition summary"> <p class=admonition-title>Files</p> <ul> <li><a href="https://github.com/nlohmann/json/releases/download/v2.1.1/json.hpp">json.hpp</a> (437 KB)</li> <li><a href="https://github.com/nlohmann/json/releases/download/v2.1.1/json.hpp.asc">json.hpp.asc</a> (1 KB)</li> </ul> </div> <p>Release date: 2017-02-25 <abbr title="Secure Hash Algorithm">SHA</abbr>-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57</p> <h3 id=summary_15>Summary<a class=headerlink href=#summary_15 title="Permanent link">¶</a></h3> <p>This release <strong>fixes a locale-related bug in the parser</strong>. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.</p> <h3 id=changes_1>Changes<a class=headerlink href=#changes_1 title="Permanent link">¶</a></h3> <ul> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Locales that have a different character than <code>.</code> as decimal separator (e.g., the Norwegian locale <code>nb_NO.UTF-8</code>) led to truncated number parsing or parse errors. The library now has been fixed to work with <strong>any locale</strong>. Note that <code>.</code> is still the only valid decimal separator for <abbr title="JavaScript Object Notation">JSON</abbr> input.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Numbers like <code>1.0</code> were correctly parsed as floating-point number, but serialized as integer (<code>1</code>). Now, <strong>floating-point numbers correctly round trip</strong>.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Parsing incorrect <abbr title="JavaScript Object Notation">JSON</abbr> numbers with leading 0 (<code>0123</code>) could yield a <a href="https://github.com/nlohmann/json/issues/452">buffer overflow</a>. This is fixed now by detecting such errors directly by the lexer.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Constructing a <abbr title="JavaScript Object Notation">JSON</abbr> value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> Comparing a <abbr title="JavaScript Object Notation">JSON</abbr> number with <code>0</code> led to a comparison with <code>null</code>. This is fixed now.</li> <li><img alt="🐛" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f41b.svg" title=":bug:"> All throw calls are now wrapped in macros.</li> <li><img alt="🔒" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f512.svg" title=":lock:"> Starting during the preparation of this release (since 8 February 2017), commits and released files are <strong>cryptographically signed</strong> with <a href="https://keybase.io/nlohmann/pgp_keys.asc?fingerprint=797167ae41c0a6d9232e48457f3cea63ae251b69">this GPG key</a>. Previous releases have also been signed.</li> <li><img alt="✨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/2728.svg" title=":sparkles:"> The parser for MessagePack and <abbr title="Concise Binary Object Representation">CBOR</abbr> now supports an optional start index parameter to define a byte offset for the parser.</li> <li><img alt="🚨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f6a8.svg" title=":rotating_light:"> Some more warnings have been fixed. With Clang, the code compiles <strong>without warnings</strong> with <code>-Weverything</code> (well, it needs <code>-Wno-documentation-unknown-command</code> and <code>-Wno-deprecated-declarations</code>, but you get the point).</li> <li><img alt="🔨" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/1f528.svg" title=":hammer:"> The code can be compiled easier with many Android NDKs by avoiding macros like <code>UINT8_MAX</code> which previously required defining a preprocessor macro for compilation.</li> <li><img alt="⚡" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/26a1.svg" title=":zap:"> The unit tests now compile two times faster.</li> <li><img alt="➕" class="twemoji" src="../../assets/external/cdn.jsdelivr.net/gh/jdeckedLine truncated
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