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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;charconv&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
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<div><a href="cpp-utility-chars_format.html"><span class="t-lines"><span>chars_format</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</td>
<td>&#25351;&#23450; <span class="t-lc">std::to_chars</span> &#21644; <span class="t-lc">std::from_chars</span> &#25152;&#29992;&#30340;&#26684;&#24335;<br />
<span class="t-mark">(&#26522;&#20030;)</span></td>
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<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-from_chars.html"><span class="t-lines"><span>from_chars</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#36716;&#25442;&#23383;&#31526;&#24207;&#21015;&#21040;&#25972;&#25968;&#25110;&#28014;&#28857;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-to_chars.html"><span class="t-lines"><span>to_chars</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#36716;&#25442;&#25972;&#25968;&#25110;&#28014;&#28857;&#20540;&#21040;&#23383;&#31526;&#24207;&#21015;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="co1">// &#21021;&#31561;&#25968;&#20540;&#36716;&#25442;&#30340;&#28014;&#28857;&#26684;&#24335;</span>
<span class="kw2">enum</span> <span class="kw1">class</span> chars_format <span class="br0">{</span>
scientific <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span>,
fixed <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span>,
hex <span class="sy1">=</span> <span class="coMULTI">/* &#26410;&#25351;&#26126; */</span>,
general <span class="sy1">=</span> fixed <span class="sy3">|</span> scientific
<span class="br0">}</span><span class="sy4">;</span>
<span class="co1">// &#21021;&#31561;&#25968;&#20540;&#36755;&#20986;&#36716;&#25442;</span>
<span class="kw1">struct</span> to_chars_result <span class="br0">{</span>
<span class="kw4">char</span><span class="sy2">*</span> ptr<span class="sy4">;</span>
errc ec<span class="sy4">;</span>
<span class="kw1">friend</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> to_chars_result<span class="sy3">&amp;</span>, <span class="kw4">const</span> to_chars_result<span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last,
<span class="coMULTI">/* &#35265;&#25551;&#36848; */</span> value, <span class="kw4">int</span> base <span class="sy1">=</span> <span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">bool</span> value, <span class="kw4">int</span> base <span class="sy1">=</span> <span class="nu0">10</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">float</span> value<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">double</span> value<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">long</span> <span class="kw4">double</span> value<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">float</span> value, chars_format fmt<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">double</span> value, chars_format fmt<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">long</span> <span class="kw4">double</span> value, chars_format fmt<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">float</span> value,
chars_format fmt, <span class="kw4">int</span> precision<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">double</span> value,
chars_format fmt, <span class="kw4">int</span> precision<span class="br0">)</span><span class="sy4">;</span>
to_chars_result to_chars<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">long</span> <span class="kw4">double</span> value,
chars_format fmt, <span class="kw4">int</span> precision<span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#21021;&#31561;&#25968;&#20540;&#36755;&#20837;&#36716;&#25442;</span>
<span class="kw1">struct</span> from_chars_result <span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> ptr<span class="sy4">;</span>
errc ec<span class="sy4">;</span>
<span class="kw1">friend</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> from_chars_result<span class="sy3">&amp;</span>, <span class="kw4">const</span> from_chars_result<span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
from_chars_result from_chars<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> last,
<span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy3">&amp;</span> value, <span class="kw4">int</span> base <span class="sy1">=</span> <span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
from_chars_result from_chars<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">float</span><span class="sy3">&amp;</span> value,
chars_format fmt <span class="sy1">=</span> chars_format<span class="sy4">::</span><span class="me2">general</span><span class="br0">)</span><span class="sy4">;</span>
from_chars_result from_chars<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">double</span><span class="sy3">&amp;</span> value,
chars_format fmt <span class="sy1">=</span> chars_format<span class="sy4">::</span><span class="me2">general</span><span class="br0">)</span><span class="sy4">;</span>
from_chars_result from_chars<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> first, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> last, <span class="kw4">long</span> <span class="kw4">double</span><span class="sy3">&amp;</span> value,
chars_format fmt <span class="sy1">=</span> chars_format<span class="sy4">::</span><span class="me2">general</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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