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<p>Initializes an object from explicit set of constructor arguments.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="#Syntax"><span class="tocnumber">1</span> <span class="toctext">Syntax</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="#Explanation"><span class="tocnumber">2</span> <span class="toctext">Explanation</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Syntax">edit</a>]</span> <span class="mw-headline" id="Syntax">Syntax</span>
</h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
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<td> <span class="t-spar">T</span> <span class="t-spar">object</span> <code><b>( </b></code> <span class="t-spar">arg</span> <code><b>);</b></code>
<p><span class="t-spar">T</span> <span class="t-spar">object</span> <code><b>( </b></code> <span class="t-spar">arg1, arg2, ...</span> <code><b>);</b></code>
</p>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td>
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<td colspan="10" class="t-sdsc-sep">
</td>
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<tr class="t-sdsc">
<td> <span class="t-spar">T</span> <span class="t-spar">object</span> <code><b>{ </b></code> <span class="t-spar">arg</span> <code><b>};</b></code>
<p><span class="t-spar">T</span> <span class="t-spar">object</span> <code><b>{ </b></code> <span class="t-spar">arg1, arg2, ...</span> <code><b>};</b></code>
</p>
</td>
<td> (2)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span>
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
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<tr class="t-sdsc">
<td> <span class="t-spar">T</span> <code><b>( </b></code> <span class="t-spar">other</span> <code><b>)</b></code>
<p><span class="t-spar">T</span> <code><b>( </b></code> <span class="t-spar">arg1, arg2, ...</span> <code><b>);</b></code>
</p>
</td>
<td> (3)
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



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<td colspan="10" class="t-sdsc-sep">
</td>
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<td> <code><b>static_cast&lt;</b></code> <span class="t-spar">T</span> <code><b>&gt;(</b></code> <span class="t-spar">other</span> <code><b>)</b></code>
</td>
<td> (4)
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
<tr class="t-sdsc">
<td> <code><b>new</b></code> <span class="t-spar">T</span><code><b>(</b></code><span class="t-spar">args, ...</span><code><b>)</b></code>
</td>
<td> (5)
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
<tr class="t-sdsc">
<td> <span class="t-spar">Class</span><code><b>::</b></code><span class="t-spar">Class</span><code><b>() : </b></code><span class="t-spar">member</span><code><b>(</b></code><span class="t-spar">args, ...</span><code><b>) {...</b></code>
</td>
<td> (6)
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
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<tr class="t-sdsc">
<td> <code><b>[</b></code>arg<code><b>](){...</b></code>
</td>
<td> (7)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span>
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
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</table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Explanation">edit</a>]</span> <span class="mw-headline" id="Explanation">Explanation</span>
</h3>
<p>Direct initialization is performed in the following situations:
</p>
<div class="t-li1">
<span class="t-li">1)</span> initialization with a nonempty parenthesized list of expressions</div>
<div class="t-li1">
<span class="t-li">2)</span> during <a href="list_initialization.html" title="cpp/language/list initialization">list-initialization</a> sequence, if no initializer-list constuctors are provided and a matching constructor is accessible, and all necessary implicit conversions are non-narrowing.</div>
<div class="t-li1">
<span class="t-li">3)</span> initialization of a prvalue temporary by <a href="explicit_cast.html" title="cpp/language/explicit cast">functional cast</a> or with a parenthesized expression list</div>
<div class="t-li1">
<span class="t-li">4)</span> initialization of a prvalue temporary by a <a href="static_cast.html" title="cpp/language/static cast">static_cast</a> expession</div>
<div class="t-li1">
<span class="t-li">5)</span> initialization of an object with dynamic storage duration by a new-expression with a non-empty initializer</div>
<div class="t-li1">
<span class="t-li">6)</span> initialization of a base or a non-static member by constructor <a href="initializer_list.html" title="cpp/language/initializer list">initializer list</a>
</div>
<div class="t-li1">
<span class="t-li">7)</span> initialization of closure object members from the variables caught by copy in a lambda-expression</div>
<p>The effects of direct initialization are:
</p>
<ul><li> If <code>T</code> is a class type, the constructors of <code>T</code> are examined and the best match is selected by overload resolution. The constructor is then called to initialize the object.
</li></ul>
<ul><li> Otherwise, if <code>T</code> is a non-class type, <a href="implicit_cast.html" title="cpp/language/implicit cast">standard conversions</a> are used, if necessary, to convert the value of <span class="t-spar">other</span> to the cv-unqualified version of <code>T</code>.
</li></ul>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span>
</h3>
<p>Direct-initialization is more permissive than copy-initialization: copy-initialization only considers non-explicit constructors and user-defined conversion functions, while direct-initialization considers all constructors and implicit conversion sequences.
</p>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span>
</h3>
<div class="t-example">
<div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;memory&gt;</span>
 
<span class="kw1">struct</span> Foo <span class="br0">{</span>
    <span class="kw4">int</span> mem<span class="sy4">;</span>
    <span class="kw1">explicit</span> Foo<span class="br0">(</span><span class="kw4">int</span> n<span class="br0">)</span> <span class="sy4">:</span> mem<span class="br0">(</span>n<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../string/basic_string.html"><span class="kw1045">std::<span class="me2">string</span></span></a> s1<span class="br0">(</span><span class="st0">"test"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// constructor from const char*</span>
    <a href="../string/basic_string.html"><span class="kw1045">std::<span class="me2">string</span></span></a> s2<span class="br0">(</span><span class="nu0">10</span>, <span class="st0">'a'</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../memory/unique_ptr.html"><span class="kw581">std::<span class="me2">unique_ptr</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> p<span class="br0">(</span>new <span class="kw4">int</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// OK: explicit constructors allowed</span>
<span class="co1">//  std::unique_ptr&lt;int&gt; p = new int(1); // error: constructor is explicit</span>
 
    Foo f<span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// f is direct-initialized:</span>
              <span class="co1">// constructor parameter n is copy-initialized from the rvalue 2</span>
              <span class="co1">// f.mem is direct-initialized from the parameter n</span>
<span class="co1">//  Foo f2 = 2; // error: constructor is explicit</span>
 
    <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> s1 <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> s2 <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>p <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> f.<span class="me1">mem</span>  <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">test aaaaaaaaaa 1 2</pre></div></div> 
</div>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span>
</h3>
<ul>
<li> <a href="default_initialization.html" title="cpp/language/default initialization">default initialization</a>
</li>
<li> <a href="copy_initialization" title="cpp/language/copy initialization">copy initialization</a>
</li>
<li> <a href="aggregate_initialization.html" title="cpp/language/aggregate initialization">aggregate initialization</a>
</li>
<li> <a href="list_initialization.html" title="cpp/language/list initialization">list initialization</a>
</li>
</ul>

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