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<title>std::ostream_iterator&lt;T,CharT,Traits&gt;::ostream_iterator</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ostream_iterator&lt;T,CharT,Traits&gt;::</span>ostream_iterator</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a>&lrm; | <a href="cpp-iterator-ostream_iterator.html">ostream iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">ostream_iterator<span class="br0">(</span> ostream_type<span class="sy3">&amp;</span> stream, <span class="kw4">const</span> CharT<span class="sy2">*</span> delim <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">ostream_iterator<span class="br0">(</span> ostream_type<span class="sy3">&amp;</span> stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<div class="t-li1"><span class="t-li">1)</span> &#20197; <code>stream</code> &#20026;&#20851;&#32852;&#27969;&#24182;&#20197; <code>delim</code> &#20026;&#20998;&#38548;&#31526;&#26500;&#36896;&#36845;&#20195;&#22120;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#20197; <code>stream</code> &#20026;&#20851;&#32852;&#27969;&#24182;&#20197;&#31354;&#25351;&#38024;&#20026;&#20998;&#38548;&#31526;&#26500;&#36896;&#36845;&#20195;&#22120;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>stream</td>
<td>-</td>
<td>&#27492;&#36845;&#20195;&#22120;&#25152;&#35775;&#38382;&#30340;&#36755;&#20986;&#27969;</td>
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<td>delim</td>
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<td>&#22312;&#27599;&#27425;&#36755;&#20986;&#21518;&#25554;&#20837;&#27969;&#30340;&#31354;&#32456;&#27490;&#23383;&#31526;&#20018;</td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;numeric&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> oo <span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> i1 <span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot;, &quot;</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-algorithm-fill_n.html"><span class="kw1588">std::<span class="me2">fill_n</span></span></a><span class="br0">(</span>i1, <span class="nu0">5</span>, <span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="sy2">*</span>oo<span class="sy2">++</span> <span class="sy1">=</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span> i2 <span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot;; &quot;</span><span class="br0">}</span><span class="sy4">;</span>
<span class="sy2">*</span>i2<span class="sy2">++</span> <span class="sy1">=</span> <span class="nu16">3.14</span><span class="sy4">;</span>
<span class="sy2">*</span>i2<span class="sy2">++</span> <span class="sy1">=</span> <span class="nu16">2.71</span><span class="sy4">;</span>
<span class="sy2">*</span>oo<span class="sy2">++</span> <span class="sy1">=</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1">&lt;</span><a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">float</span><span class="sy1">&gt;&gt;</span>,
std<span class="sy4">::</span><span class="me2">default_sentinel_t</span><span class="sy1">&gt;</span>
first <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="br0">{</span><a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">float</span><span class="sy1">&gt;</span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>,<span class="st0">&quot; ~ &quot;</span><span class="br0">}</span>, <span class="nu0">5</span><span class="br0">}</span> <span class="br0">}</span>,
last <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-algorithm-iota.html"><span class="kw1655">std::<span class="me2">iota</span></span></a><span class="br0">(</span>first, last, <span class="nu16">2.2</span><span class="br0">)</span><span class="sy4">;</span>
<span class="sy2">*</span>oo<span class="sy2">++</span> <span class="sy1">=</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">-1, -1, -1, -1, -1,
3.14; 2.71;
2.2 ~ 3.2 ~ 4.2 ~ 5.2 ~ 6.2 ~</pre></div>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
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<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/P2325R3">P2325R3</a></td>
<td>C++20</td>
<td>&#30001;&#20110; C++20 &#36845;&#20195;&#22120;&#24517;&#39035;&#20026; <a href="cpp-concepts-default_initializable.html"><code>default_initializable</code></a> &#25552;&#20379;&#20102;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;</td>
<td>&#19982;&#35813;&#35201;&#27714;&#19968;&#21516;&#31227;&#38500;</td>
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