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</code></pre></div> <p>When defined, the library uses only portable C++ code where it would otherwise use vector instructions: when scanning strings during parsing, and when writing floating-point numbers during serialization. This includes the parser of <a href=../../basic_json_document/ ><code>basic_json_document</code></a> (<code><nlohmann/json_view.hpp></code>).</p> <p>The macro is an escape hatch, for example for toolchains that cannot compile the vector code, for sanitizers or analyzers that do not understand it, or to compare the speed of both variants. It does not change any result: values, exceptions, and error positions are the same either way. Only the speed differs.</p> <h2 id=default-definition>Default definition<a class=headerlink href=#default-definition title="Permanent link">¶</a></h2> <p>By default, <code class=highlight><span class=n>JSON_NO_SIMD</span></code> is not defined, and vector instructions are used where the target has them.</p> <div class=highlight><pre><span></span><code><span class=cp>#undef JSON_NO_SIMD</span>
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</code></pre></div> <h2 id=notes>Notes<a class=headerlink href=#notes title="Permanent link">¶</a></h2> <div class="admonition note"> <p class=admonition-title>Which instructions are used</p> <ul> <li><strong>x86-64:</strong> <abbr title="Streaming SIMD Extensions 2">SSE2</abbr>, which every x86-64 <abbr title="Central Processing Unit">CPU</abbr> has, finds the end of runs of plain string characters 16 bytes at a time and writes the digits of floating-point numbers. The <abbr title="Unicode Transformation Format">UTF</abbr>-8 check of non-<abbr title="American Standard Code for Information Interchange">ASCII</abbr> text needs <abbr title="Supplemental Streaming SIMD Extensions 3">SSSE3</abbr>, which is not part of x86-64: it is compiled for <abbr title="Supplemental Streaming SIMD Extensions 3">SSSE3</abbr> with a function attribute and used when the <abbr title="Central Processing Unit">CPU</abbr> has <abbr title="Supplemental Streaming SIMD Extensions 3">SSSE3</abbr> (every x86-64 <abbr title="Central Processing Unit">CPU</abbr> since about 2011), else the portable check. Code compiled for <abbr title="Supplemental Streaming SIMD Extensions 3">SSSE3</abbr> anyway (e.g., with <code>-mssse3</code> or <code>-march=native</code>) skips this check of the <abbr title="Central Processing Unit">CPU</abbr>. 32-bit x86 uses <abbr title="Streaming SIMD Extensions 2">SSE2</abbr> for strings when the compiler targets it.</li> <li><strong><abbr title="64-bit execution state of the Arm architecture">AArch64</abbr>:</strong> <abbr title="Arm SIMD instruction set extension">NEON</abbr>, which every 64-bit Arm <abbr title="Central Processing Unit">CPU</abbr> has, checks <abbr title="Unicode Transformation Format">UTF</abbr>-8 text and long runs of plain string characters 16 bytes at a time, and writes the digits of floating-point numbers. With <abbr title="Microsoft Visual C++">MSVC</abbr>, only the floating-point digits use <abbr title="Arm SIMD instruction set extension">NEON</abbr>.</li> <li><strong>Other targets:</strong> portable code only.</li> </ul> <p>Strings are only scanned this way for contiguous input and for the characters a <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>istream</span></code> holds in its stream buffer (see <a href=../json_disable_stream_bulk_scan/ ><code>JSON_DISABLE_STREAM_BULK_SCAN</code></a>); other inputs are read one character at a time.</p> </div> <div class="admonition note"> <p class=admonition-title>Interaction with <code>JSON_USE_SIMDUTF</code></p> <p>With <a href=../json_use_simdutf/ ><code>JSON_USE_SIMDUTF</code></a>, runs of string characters are first validated by simdutf; the code described here is used for what simdutf does not accept, so that errors are reported at the same position. <code>JSON_NO_SIMD</code> does not affect simdutf.</p> </div> <div class="admonition note"> <p class=admonition-title><abbr title="Application Binary Interface">ABI</abbr> compatibility</p> <p>The macro selects between two definitions of the library's internal scanning and formatting functions. Whether it is defined is encoded in the <a href=../../../features/namespace/ >namespace</a> (tag <code>_ns</code>), resulting in distinct symbol names. Translation units compiled with and without it can therefore be linked into the same program without One Definition Rule (<abbr title="One Definition Rule">ODR</abbr>) violations, but they cannot exchange instances of library types.</p> </div> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">¶</a></h2> <details class=example> <summary>Example: switching off vector instructions</summary> <p>The program parses and serializes the same values with and without the macro:</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_NO_SIMD</span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
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@@ -11,4 +11,4 @@
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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>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{"name": "日本語 text", "pi": 3.141592653589793}</span><span class=dl>)</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>j</span><span class=p>.</span><span class=n>dump</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>// {"name":"日本語 text","pi":3.141592653589793}</span>
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<span class=p>}</span>
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</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../basic_json/parse/ ><strong>parse</strong></a> - deserialize from a compatible input</li> <li><a href=../../basic_json/dump/ ><strong>dump</strong></a> - serialization</li> <li><a href=../json_use_simdutf/ ><strong>JSON_USE_SIMDUTF</strong></a> - use the simdutf library to accelerate <abbr title="Unicode Transformation Format">UTF</abbr>-8 validation</li> <li><a href=../json_disable_stream_bulk_scan/ ><strong>JSON_DISABLE_STREAM_BULK_SCAN</strong></a> - read a <code>std::istream</code> one character at a time</li> <li><a href=../../../features/parsing/#input-sources-and-performance>Parsing: input sources and performance</a></li> <li><a href=../../../features/json_view/ >json_view</a> - the zero-copy view, whose parser the macro also affects</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</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="October 26, 2026 19:13:31 UTC">October 26, 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, FoLine truncated
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</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../basic_json/parse/ ><code>parse</code></a> - deserialize from a compatible input</li> <li><a href=../../basic_json/dump/ ><code>dump</code></a> - serialization</li> <li><a href=../json_use_simdutf/ ><code>JSON_USE_SIMDUTF</code></a> - use the simdutf library to accelerate <abbr title="Unicode Transformation Format">UTF</abbr>-8 validation</li> <li><a href=../json_disable_stream_bulk_scan/ ><code>JSON_DISABLE_STREAM_BULK_SCAN</code></a> - read a <code>std::istream</code> one character at a time</li> <li><a href=../../../features/parsing/#input-sources-and-performance>Parsing: input sources and performance</a> - how input sources affect parsing performance</li> <li><a href=../../../features/serialization/ >Serialization</a> - pretty-printing, <abbr title="Unicode Transformation Format">UTF</abbr>-8 handling, and number output</li> <li><a href=../../../features/json_view/ >Zero-copy <abbr title="JavaScript Object Notation">JSON</abbr> views</a> - the zero-copy view, whose parser the macro also affects</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</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="October 27, 2026 06:41:42 UTC">October 27, 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> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../json_no_io/ class="md-footer__link md-footer__link--prev" aria-label="Previous: JSON_NO_IO"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> JSON_NO_IO </div> </div> </a> <a href=../json_no_thread_local/ class="md-footer__link md-footer__link--next" aria-label="Next: JSON_NO_THREAD_LOCAL"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> JSON_NO_THREAD_LOCAL </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <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 0Line truncated
|
||||
@@ -56,12 +56,13 @@ int main()
|
||||
|
||||
## See also
|
||||
|
||||
- [**parse**](https://json.nlohmann.me/api/basic_json/parse/index.md) - deserialize from a compatible input
|
||||
- [**dump**](https://json.nlohmann.me/api/basic_json/dump/index.md) - serialization
|
||||
- [**JSON_USE_SIMDUTF**](https://json.nlohmann.me/api/macros/json_use_simdutf/index.md) - use the simdutf library to accelerate UTF-8 validation
|
||||
- [**JSON_DISABLE_STREAM_BULK_SCAN**](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md) - read a `std::istream` one character at a time
|
||||
- [Parsing: input sources and performance](https://json.nlohmann.me/features/parsing/#input-sources-and-performance)
|
||||
- [json_view](https://json.nlohmann.me/features/json_view/index.md) - the zero-copy view, whose parser the macro also affects
|
||||
- [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) - deserialize from a compatible input
|
||||
- [`dump`](https://json.nlohmann.me/api/basic_json/dump/index.md) - serialization
|
||||
- [`JSON_USE_SIMDUTF`](https://json.nlohmann.me/api/macros/json_use_simdutf/index.md) - use the simdutf library to accelerate UTF-8 validation
|
||||
- [`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md) - read a `std::istream` one character at a time
|
||||
- [Parsing: input sources and performance](https://json.nlohmann.me/features/parsing/#input-sources-and-performance) - how input sources affect parsing performance
|
||||
- [Serialization](https://json.nlohmann.me/features/serialization/index.md) - pretty-printing, UTF-8 handling, and number output
|
||||
- [Zero-copy JSON views](https://json.nlohmann.me/features/json_view/index.md) - the zero-copy view, whose parser the macro also affects
|
||||
|
||||
## Version history
|
||||
|
||||
|
||||
Reference in new issue
Block a user