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<h1>
Library Configuration <span class="m-thin">module</span></h1>
<p>Preprocessor macros for configuring library functionality.</p>
<nav class="m-block m-default poxy-toc" id="poxy-toc">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#define-members">Defines</a></li>
</ul>
</li>
</ul>
</nav>
<p>Define these before including toml++ to alter the way it functions.</p><aside class="m-note m-default"><h4>Remark</h4><p>Some of these options have ABI implications; inline namespaces are used to prevent you from trying to link incompatible combinations together.</p></aside>
<section id="define-members">
<h2><a href="#define-members">Defines</a></h2>
<dl class="m-doc">
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga8c407a8f6fe52a795db35be3f00393f8">TOML_ASSERT</a>(</span><span class="m-doc-wrap">expr)</span>
</dt>
<dd>Sets the assert function used by the library.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga2bfc7ae4747f15378d92249aadce019e">TOML_CALLCONV</a></span>
</dt>
<dd>Calling convention to apply to exported free/static functions.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga09204feb4a3ff5534623c2bd052dcec0">TOML_CONFIG_HEADER</a></span>
</dt>
<dd>An additional header to include before any other toml++ header files.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga5c13a4a38e4b663c78ab84b7c99845f4">TOML_DISABLE_CONDITIONAL_NOEXCEPT_LAMBDA</a></span>
</dt>
<dd>Disable using noexcept(<condition>) in lambda definitions within the toml++ library implementation.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#gac69eea7bc0905d58a6afc199982ed7ad">TOML_DISABLE_NOEXCEPT_NOEXCEPT</a></span>
</dt>
<dd>Disable using noexcept(noexcept(<expression>)) within the toml++ library implementation.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga56ab81041897681ac38ceba52a380b97">TOML_ENABLE_FLOAT16</a></span>
</dt>
<dd>Enable support for the built-in <code><a class="m-doc poxy-injected poxy-external" href="https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html" target="_blank">_Float16</a></code> type.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga9fc77582d9de77f59d2ddc9ae1f748ca">TOML_ENABLE_FORMATTERS</a></span>
</dt>
<dd>Sets whether the various formatter classes are enabled.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga121912d75d4624de6ab6854e41d8a852">TOML_ENABLE_PARSER</a></span>
</dt>
<dd>Sets whether the parser-related parts of the library are included.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga1110ff7d189a7738b9109d120f568b6b">TOML_ENABLE_UNRELEASED_FEATURES</a></span>
</dt>
<dd>Enables support for unreleased TOML language features not yet part of a <a class="poxy-external" href="https://github.com/toml-lang/toml/releases" target="_blank">numbered version</a>.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga94867db67c98e0e9d4fbb70690951fbf">TOML_ENABLE_WINDOWS_COMPAT</a></span>
</dt>
<dd>Enables the use of wide strings (<a class="m-doc poxy-injected poxy-external poxy-cppreference" href="https://en.cppreference.com/w/cpp/language/types#Character_types" target="_blank">wchar_t</a>, <a class="m-doc-external poxy-cppreference poxy-external" href="http://en.cppreference.com/w/cpp/string/basic_string.html" target="_blank">std::<wbr/>wstring</a>) in various places throughout the library when building for Windows.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga93097ecd88ca4bca393f60a78bda643b">TOML_EXCEPTIONS</a></span>
</dt>
<dd>Sets whether the library uses exceptions to report parsing failures.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga3d7aebf91431575688d573f09a17559a">TOML_EXPORTED_CLASS</a></span>
</dt>
<dd>An 'export' annotation to add to classes.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#gac40a454cde06de4e76df3d6d460a3544">TOML_EXPORTED_FREE_FUNCTION</a></span>
</dt>
<dd>An 'export' annotation to add to free functions.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#gadf515bb7a6b8ce6b14bf86c8961a63cb">TOML_EXPORTED_MEMBER_FUNCTION</a></span>
</dt>
<dd>An 'export' annotation to add to non-static class member functions.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga8436c6f378c73f3446a3b6f1e2c5e81c">TOML_EXPORTED_STATIC_FUNCTION</a></span>
</dt>
<dd>An 'export' annotation to add to <code>static</code> class member functions.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga8219bfd7e75587516385b6022b28abc2">TOML_HEADER_ONLY</a></span>
</dt>
<dd>Sets whether the library is entirely inline.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga27ee69835a1ddff9dbaf3015b4b08a11">TOML_IMPLEMENTATION</a></span>
</dt>
<dd>Enables the library's implementation when <a class="m-doc" href="#ga8219bfd7e75587516385b6022b28abc2">TOML_<wbr/>HEADER_<wbr/>ONLY</a> is disabled.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga9c2c03f867eb6d76a5f65b06eeb1186e">TOML_OPTIONAL_TYPE</a></span>
</dt>
<dd>Overrides the <code>optional<T></code> type used by the library.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga11a3368da40938a6b5cfd898320706f7">TOML_SMALL_FLOAT_TYPE</a></span>
</dt>
<dd>If your codebase has an additional 'small' float type (e.g. half-precision), this tells toml++ about it.</dd>
<dt>
<span class="m-doc-wrap-bumper">#define <a class="m-doc" href="#ga0722fa2c57da6360c7f2ba08c60e1a81">TOML_SMALL_INT_TYPE</a></span>
</dt>
<dd>If your codebase has an additional 'small' integer type (e.g. 24-bits), this tells toml++ about it.</dd>
</dl>
</section>
<section>
<h2>Define documentation</h2>
<section class="m-doc-details" id="ga8c407a8f6fe52a795db35be3f00393f8"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga8c407a8f6fe52a795db35be3f00393f8">TOML_ASSERT</a>(</span><span class="m-doc-wrap">expr)</span>
</h3>
<p>Sets the assert function used by the library.</p>
<p>Defaults to the standard C <code>assert()</code>.</p>
</div></section>
<section class="m-doc-details" id="ga2bfc7ae4747f15378d92249aadce019e"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga2bfc7ae4747f15378d92249aadce019e">TOML_CALLCONV</a></span>
</h3>
<p>Calling convention to apply to exported free/static functions.</p>
<p>Not defined by default (let the compiler decide).</p>
</div></section>
<section class="m-doc-details" id="ga09204feb4a3ff5534623c2bd052dcec0"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga09204feb4a3ff5534623c2bd052dcec0">TOML_CONFIG_HEADER</a></span>
</h3>
<p>An additional header to include before any other toml++ header files.</p>
<p>Not defined by default.</p>
</div></section>
<section class="m-doc-details" id="ga5c13a4a38e4b663c78ab84b7c99845f4"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga5c13a4a38e4b663c78ab84b7c99845f4">TOML_DISABLE_CONDITIONAL_NOEXCEPT_LAMBDA</a></span>
</h3>
<p>Disable using noexcept(<condition>) in lambda definitions within the toml++ library implementation.</p>
<p>This macro offers a workaround to a bug in the old "legacy lambda processor" of Visual C++, which caused compile errors like "error C2057: expected constant expression", when it encountered such lambda's. These compile errors were reported by Kevin Dick, Jan 19, 2024, at <a class="poxy-external" href="https://github.com/marzer/tomlplusplus/issues/219" target="_blank">https:/<wbr/>/<wbr/>github.com/<wbr/>marzer/<wbr/>tomlplusplus/<wbr/>issues/<wbr/>219</a></p>
</div></section>
<section class="m-doc-details" id="gac69eea7bc0905d58a6afc199982ed7ad"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#gac69eea7bc0905d58a6afc199982ed7ad">TOML_DISABLE_NOEXCEPT_NOEXCEPT</a></span>
</h3>
<p>Disable using noexcept(noexcept(<expression>)) within the toml++ library implementation.</p>
<p>This macro offers a workaround to a bug in Visual C++ (Visual Studio 2022), which caused compile errors, saying: "error C3878: syntax error: unexpected token ',' following 'simple-type-specifier'"</p>
</div></section>
<section class="m-doc-details" id="ga56ab81041897681ac38ceba52a380b97"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga56ab81041897681ac38ceba52a380b97">TOML_ENABLE_FLOAT16</a></span>
</h3>
<p>Enable support for the built-in <code><a class="m-doc poxy-injected poxy-external" href="https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html" target="_blank">_Float16</a></code> type.</p>
<p>Defaults to <code>0</code>.</p>
</div></section>
<section class="m-doc-details" id="ga9fc77582d9de77f59d2ddc9ae1f748ca"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga9fc77582d9de77f59d2ddc9ae1f748ca">TOML_ENABLE_FORMATTERS</a></span>
</h3>
<p>Sets whether the various formatter classes are enabled.</p>
<p>Defaults to <code>1</code>.</p><aside class="m-note m-default"><h4>Remark</h4><p>If you don't need to re-serialize TOML data, setting <code>TOML_ENABLE_FORMATTERS</code> to <code>0</code> can improve compilation speed and reduce binary size.</p></aside><aside class="m-note m-default"><h4>See also</h4><ul><li><a class="m-doc" href="classtoml_1_1toml__formatter.html">toml::<wbr/>toml_formatter</a></li><li><a class="m-doc" href="classtoml_1_1json__formatter.html">toml::<wbr/>json_formatter</a></li><li><a class="m-doc" href="classtoml_1_1yaml__formatter.html">toml::<wbr/>yaml_formatter</a></li></ul></aside>
</div></section>
<section class="m-doc-details" id="ga121912d75d4624de6ab6854e41d8a852"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga121912d75d4624de6ab6854e41d8a852">TOML_ENABLE_PARSER</a></span>
</h3>
<p>Sets whether the parser-related parts of the library are included.</p>
<p>Defaults to <code>1</code>.</p><aside class="m-note m-default"><h4>Remark</h4><p>If you don't parse any TOML from files or strings, setting <code>TOML_ENABLE_PARSER</code> to <code>0</code> can improve compilation speed and reduce binary size.</p></aside>
</div></section>
<section class="m-doc-details" id="ga1110ff7d189a7738b9109d120f568b6b"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga1110ff7d189a7738b9109d120f568b6b">TOML_ENABLE_UNRELEASED_FEATURES</a></span>
</h3>
<p>Enables support for unreleased TOML language features not yet part of a <a class="poxy-external" href="https://github.com/toml-lang/toml/releases" target="_blank">numbered version</a>.</p>
<p>Defaults to <code>0</code>.</p><aside class="m-note m-default"><h4>See also</h4><p><a class="poxy-external" href="https://github.com/marzer/tomlplusplus/blob/master/README.md#toml-language-support" target="_blank">TOML Language Support</a></p></aside>
</div></section>
<section class="m-doc-details" id="ga94867db67c98e0e9d4fbb70690951fbf"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga94867db67c98e0e9d4fbb70690951fbf">TOML_ENABLE_WINDOWS_COMPAT</a></span>
</h3>
<p>Enables the use of wide strings (<a class="m-doc poxy-injected poxy-external poxy-cppreference" href="https://en.cppreference.com/w/cpp/language/types#Character_types" target="_blank">wchar_t</a>, <a class="m-doc-external poxy-cppreference poxy-external" href="http://en.cppreference.com/w/cpp/string/basic_string.html" target="_blank">std::<wbr/>wstring</a>) in various places throughout the library when building for Windows.</p>
<p>Defaults to <code>1</code> when building for Windows, <code>0</code> otherwise. Has no effect when building for anything other than Windows.</p><aside class="m-note m-default"><h4>Remark</h4><p>This <strong>does not</strong> change the underlying string type used to represent TOML keys and string values; that will still be <a class="m-doc-external poxy-cppreference poxy-external" href="http://en.cppreference.com/w/cpp/string/basic_string.html" target="_blank">std::<wbr/>string</a>. This setting simply enables some narrow <=> wide string conversions when necessary at various interface boundaries.<br/><br/>If you're building for Windows and you have no need for Windows' "Pretends-to-be-unicode" wide strings, you can safely set this to <code>0</code>.</p></aside>
</div></section>
<section class="m-doc-details" id="ga93097ecd88ca4bca393f60a78bda643b"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga93097ecd88ca4bca393f60a78bda643b">TOML_EXCEPTIONS</a></span>
</h3>
<p>Sets whether the library uses exceptions to report parsing failures.</p>
<p>Defaults to <code>1</code> or <code>0</code> according to your compiler's exception mode.</p>
</div></section>
<section class="m-doc-details" id="ga3d7aebf91431575688d573f09a17559a"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga3d7aebf91431575688d573f09a17559a">TOML_EXPORTED_CLASS</a></span>
</h3>
<p>An 'export' annotation to add to classes.</p>
<p>Not defined by default.</p><aside class="m-note m-default"><h4>Remark</h4><p>You might override this with <code>__declspec(dllexport)</code> if you were building the library into the public API of a DLL on Windows.</p></aside>
</div></section>
<section class="m-doc-details" id="gac40a454cde06de4e76df3d6d460a3544"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#gac40a454cde06de4e76df3d6d460a3544">TOML_EXPORTED_FREE_FUNCTION</a></span>
</h3>
<p>An 'export' annotation to add to free functions.</p>
<p>Not defined by default.</p><aside class="m-note m-default"><h4>Remark</h4><p>You might override this with <code>__declspec(dllexport)</code> if you were building the library into the public API of a DLL on Windows.</p></aside>
</div></section>
<section class="m-doc-details" id="gadf515bb7a6b8ce6b14bf86c8961a63cb"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#gadf515bb7a6b8ce6b14bf86c8961a63cb">TOML_EXPORTED_MEMBER_FUNCTION</a></span>
</h3>
<p>An 'export' annotation to add to non-static class member functions.</p>
<p>Not defined by default.</p><aside class="m-note m-default"><h4>Remark</h4><p>You might override this with <code>__declspec(dllexport)</code> if you were building the library into the public API of a DLL on Windows.</p></aside>
</div></section>
<section class="m-doc-details" id="ga8436c6f378c73f3446a3b6f1e2c5e81c"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga8436c6f378c73f3446a3b6f1e2c5e81c">TOML_EXPORTED_STATIC_FUNCTION</a></span>
</h3>
<p>An 'export' annotation to add to <code>static</code> class member functions.</p>
<p>Not defined by default.</p><aside class="m-note m-default"><h4>Remark</h4><p>You might override this with <code>__declspec(dllexport)</code> if you were building the library into the public API of a DLL on Windows.</p></aside>
</div></section>
<section class="m-doc-details" id="ga8219bfd7e75587516385b6022b28abc2"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga8219bfd7e75587516385b6022b28abc2">TOML_HEADER_ONLY</a></span>
</h3>
<p>Sets whether the library is entirely inline.</p>
<p>Defaults to <code>1</code>.</p><aside class="m-note m-default"><h4>Remark</h4><p>Disabling this means that you must define <a class="m-doc" href="#ga27ee69835a1ddff9dbaf3015b4b08a11">TOML_<wbr/>IMPLEMENTATION</a> in <strong><em>exactly one</em></strong> translation unit in your project:</p><pre class="m-code"><span class="c1">// global_header_that_includes_toml++.h</span>
<span class="cp">#define </span><span class="fm">TOML_HEADER_ONLY</span><span class="cp"> 0</span>
<span class="cp">#include</span> <span class="cpf"><toml.hpp></span>
<span class="c1">// some_code_file.cpp</span>
<span class="cp">#define </span><span class="fm">TOML_IMPLEMENTATION</span>
<span class="cp">#include</span> <span class="cpf">"global_header_that_includes_toml++.h"</span></pre></aside>
</div></section>
<section class="m-doc-details" id="ga27ee69835a1ddff9dbaf3015b4b08a11"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga27ee69835a1ddff9dbaf3015b4b08a11">TOML_IMPLEMENTATION</a></span>
</h3>
<p>Enables the library's implementation when <a class="m-doc" href="#ga8219bfd7e75587516385b6022b28abc2">TOML_<wbr/>HEADER_<wbr/>ONLY</a> is disabled.</p>
<p>Not defined by default. Meaningless when <a class="m-doc" href="#ga8219bfd7e75587516385b6022b28abc2">TOML_<wbr/>HEADER_<wbr/>ONLY</a> is enabled.</p>
</div></section>
<section class="m-doc-details" id="ga9c2c03f867eb6d76a5f65b06eeb1186e"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga9c2c03f867eb6d76a5f65b06eeb1186e">TOML_OPTIONAL_TYPE</a></span>
</h3>
<p>Overrides the <code>optional<T></code> type used by the library.</p>
<p>Not defined by default (use <a class="m-doc-external poxy-cppreference poxy-external" href="http://en.cppreference.com/w/cpp/utility/optional.html" target="_blank">std::<wbr/>optional</a>).</p><aside class="m-note m-danger"><h4>Warning</h4><p>The library uses optionals internally in a few places; if you choose to replace the optional type it must be with something that is still API-compatible with <a class="m-doc-external poxy-cppreference poxy-external" href="http://en.cppreference.com/w/cpp/utility/optional.html" target="_blank">std::<wbr/>optional</a> (e.g. <a class="poxy-external" href="https://github.com/TartanLlama/optional" target="_blank">tl::<wbr/>optional</a>).</p></aside>
</div></section>
<section class="m-doc-details" id="ga11a3368da40938a6b5cfd898320706f7"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga11a3368da40938a6b5cfd898320706f7">TOML_SMALL_FLOAT_TYPE</a></span>
</h3>
<p>If your codebase has an additional 'small' float type (e.g. half-precision), this tells toml++ about it.</p>
<p>Not defined by default.</p>
</div></section>
<section class="m-doc-details" id="ga0722fa2c57da6360c7f2ba08c60e1a81"><div>
<h3>
<span class="m-doc-wrap-bumper">#define <a class="m-doc-self" href="#ga0722fa2c57da6360c7f2ba08c60e1a81">TOML_SMALL_INT_TYPE</a></span>
</h3>
<p>If your codebase has an additional 'small' integer type (e.g. 24-bits), this tells toml++ about it.</p>
<p>Not defined by default.</p>
</div></section>
</section>
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