124 lines
11 KiB
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124 lines
11 KiB
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<title>std::get_money</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_manip_get_money skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>get_money</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-manip.html">manip</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div>定义于头文件 <code><a href="cpp-header-iomanip.html"><iomanip></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> MoneyT <span class="sy1">></span><br />
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<span class="coMULTI">/*unspecified*/</span> get_money<span class="br0">(</span> MoneyT<span class="sy3">&</span> mon, <span class="kw4">bool</span> intl <span class="sy1">=</span> <span class="kw2">false</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>用于表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">>></span> get_money<span class="br0">(</span>mon, intl<span class="br0">)</span></span></span> 中时，分析字符输入为 <code>in</code> 中当前感染的 locale 的 <span class="t-lc"><a href="cpp-locale-money_get.html">std::money_get</a></span> 平面所指定的货币值，并存储结果于 <code>mon</code> 。</p>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">>></span> get_money<span class="br0">(</span>mon, intl<span class="br0">)</span></span></span> 中的释出操作表现为<a href="cpp-named_req-FormattedInputFunction.html"><span style="font-style:italic">有格式输入函数</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(FormattedInputFunction)</span></a> 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>mon</td>
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<td>-</td>
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<td>要被写入货币值的变量。能为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_string</span></span> 之一</td>
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<tr class="t-par">
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<td>intl</td>
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<td>-</td>
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<td>若为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则期待找到要求的国际通货字符串，否则期待可选的通货符号</td>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>返回未指定类型对象，使得若 <code>in</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span></span> 类型输入流的名称，则表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">>></span> get_money<span class="br0">(</span>mon, intl<span class="br0">)</span></span></span> 表现为如同执行下列代码：</p>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">typedef</span> <a href="cpp-iterator-istreambuf_iterator.html"><span class="kw669">std::<span class="me2">istreambuf_iterator</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span> Iter<span class="sy4">;</span><br />
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<span class="kw1">typedef</span> <a href="cpp-locale-money_get.html"><span class="kw1963">std::<span class="me2">money_get</span></span></a><span class="sy1"><</span>CharT, Iter<span class="sy1">></span> MoneyGet<span class="sy4">;</span><br />
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<a href="cpp-io-ios_base-iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a> err <span class="sy1">=</span> <a href="cpp-io-ios_base-iostate.html"><span class="kw1698">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">goodbit</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">const</span> MoneyGet <span class="sy3">&</span>mg <span class="sy1">=</span> <a href="cpp-locale-use_facet.html"><span class="kw1896">std::<span class="me2">use_facet</span></span></a><span class="sy1"><</span>MoneyGet<span class="sy1">></span><span class="br0">(</span>in.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span><br />
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mg.<span class="me1">get</span><span class="br0">(</span>Iter<span class="br0">(</span>in.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>, Iter<span class="br0">(</span><span class="br0">)</span>, intl, in, err, mon<span class="br0">)</span><span class="sy4">;</span><br />
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<span class="kw1">if</span> <span class="br0">(</span><a href="cpp-io-ios_base-iostate.html"><span class="kw1698">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">goodbit</span></span></a> <span class="sy3">!</span><span class="sy1">=</span> err<span class="br0">)</span><br />
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out.<span class="me1">setstate</span><span class="br0">(</span>err<span class="br0">)</span><span class="sy4">;</span></span></span></p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <sstream></span>
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<span class="co2">#include <locale></span>
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<span class="co2">#include <iomanip></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-basic_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> in<span class="br0">(</span><span class="st0">"$1,234.56 2.22 USD 3.33"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">long</span> <span class="kw4">double</span> v1, v2<span class="sy4">;</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> v3<span class="sy4">;</span>
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in.<span class="me1">imbue</span><span class="br0">(</span><a href="cpp-locale-locale.html"><span class="kw1893">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="st0">"en_US.UTF-8"</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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in <span class="sy1">>></span> std<span class="sy4">::</span><span class="me2">get_money</span><span class="br0">(</span>v1<span class="br0">)</span> <span class="sy1">>></span> std<span class="sy4">::</span><span class="me2">get_money</span><span class="br0">(</span>v2<span class="br0">)</span> <span class="sy1">>></span> std<span class="sy4">::</span><span class="me2">get_money</span><span class="br0">(</span>v3, <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>in<span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-quoted.html"><span class="kw1801">std::<span class="me2">quoted</span></span></a><span class="br0">(</span>in.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" parsed as: "</span>
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<span class="sy1"><<</span> v1 <span class="sy1"><<</span> <span class="st0">", "</span> <span class="sy1"><<</span> v2 <span class="sy1"><<</span> <span class="st0">", "</span> <span class="sy1"><<</span> v3 <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Parse failed"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">"$1,234.56 2.22 USD 3.33" parsed as: 123456, 222, 333</pre></div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-money_get.html"><span class="t-lines"><span>money_get</span></span></a></div>
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</div>
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</td>
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<td>从输入字符序列中解析并构造货币值<br />
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<span class="t-mark">(类模板)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-manip-put_money.html"><span class="t-lines"><span>put_money</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>格式化并输出货币值<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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