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make_unique.html
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make_unique.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>make_unique</title>
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<title>make_unique</title>
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<body text="#000000" bgcolor="#ffffff" link="#0000ff" vlink="#0000ff">
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<h1><img height="86" alt="boost.png (6897 bytes)" src="../../boost.png"
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<h1>make_unique</h1>
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width="277" align="middle" border="0">make_unique</h1>
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<div id="navigation">
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<p><a href="#introduction">Introduction</a><br>
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<ul>
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<a href="#synopsis">Synopsis</a><br>
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<li><a href="#introduction">Introduction</a></li>
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<a href="#common">Common Requirements</a><br>
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<li><a href="#synopsis">Synopsis</a></li>
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<a href="#functions">Free Functions</a><br>
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<li><a href="#requirements">Common Requirements</a></li>
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<a href="#history">History</a></p>
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<li><a href="#functions">Free Functions</a></li>
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<h2><a name="introduction">Introduction</a></h2>
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<li><a href="#history">History</a></li>
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<p>The header file <boost/make_unique.hpp> provides overloaded
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</ul>
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function template <code>make_unique</code> for convenient creation of
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</div>
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<code>unique_ptr</code> objects.</p>
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<div id="introduction">
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<h2><a name="synopsis">Synopsis</a></h2>
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<h2>Introduction</h2>
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<pre>namespace boost {
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<p>
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template<class U> // U is not array
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The header file <boost/make_unique.hpp> provides overloads of
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unique_ptr<U> <a href="#functions">make_unique</a>();
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function template <code>make_unique</code> for convenient creation of
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<code>std::unique_ptr</code> objects.
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template<class U, class... Args> // U is not array
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</p>
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unique_ptr<U> <a href="#functions">make_unique</a>(Args&&... args);
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</div>
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<div id="synopsis">
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template<class U> // U is not array
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<h2>Synopsis</h2>
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unique_ptr<U> <a href="#functions">make_unique</a>(U&& value);
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<div>
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<h3>Header <boost/smart_ptr/make_unique.hpp></h3>
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template<class U> // U is T[]
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<code>namespace boost {</code>
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unique_ptr<U> <a href="#functions">make_unique</a>(size_t size);
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<blockquote>
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<code>template<class T><br>std::unique_ptr<T>
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template<class U> // U is not array
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<a href="#functions">make_unique</a>();</code>
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unique_ptr<U> <a href="#functions">make_unique_noinit</a>();
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</blockquote>
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<blockquote>
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template<class U> // U is T[]
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<code>template<class T, class... Args><br>std::unique_ptr<T>
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unique_ptr<U> <a href="#functions">make_unique_noinit</a>(size_t size);
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<a href="#functions">make_unique</a>(Args&&... args);</code>
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}</pre>
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</blockquote>
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<h2><a name="common">Common Requirements</a></h2>
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<blockquote>
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<pre>template<class U>
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<code>template<class T><br>std::unique_ptr<T>
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unique_ptr<U> make_unique(<em>args</em>);</pre>
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<a href="#functions">make_unique</a>(<em>T</em>&& value);</code>
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<pre>template<class U>
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</blockquote>
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unique_ptr<U> make_unique_noinit(<em>args</em>);</pre>
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<blockquote>
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<blockquote>
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<code>template<class T><br>std::unique_ptr<T>
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<p><b>Effects:</b> Allocates memory for an object of type <code>U</code>
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<a href="#functions">make_unique</a>(std::size_t size);</code>
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(or <code>T[size]</code> when <code>U</code> is <code>T[]</code>,
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</blockquote>
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where <code>size</code> is determined from <code>args</code> as
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<blockquote>
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specified by the concrete overload). The object is initialized from
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<code>template<class T><br>std::unique_ptr<T>
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<code>args</code> as specified by the concrete overload. If an
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<a href="#functions">make_unique_noinit</a>();</code>
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exception is thrown, the functions have no effect.</p>
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</blockquote>
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<p><b>Returns:</b> A <code>unique_ptr</code> instance that stores and
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<blockquote>
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owns the address of the newly constructed object.</p>
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<code>template<class T><br>std::unique_ptr<T>
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<p><b>Postconditions:</b> <code>r.get() != 0</code>, where
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<a href="#functions">make_unique_noinit</a>(std::size_t size);</code>
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<code>r</code> is the return value.</p>
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</blockquote>
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<p><b>Throws:</b> <code>bad_alloc</code>, or an exception thrown from
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<code>}</code>
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the initialization of the object.</p>
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</div>
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<p><b>Remarks:</b></p>
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</div>
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<blockquote>
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<div id="requirements">
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<p>When an object of a non-array type <code>T</code> is specified to
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<h2>Common Requirements</h2>
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be initialized to a value <code>value</code>, or to
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<h3><code>template<class T, <em>Args</em>><br>
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<code>T(list...)</code>, where <code>list...</code> is a list of
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std::unique_ptr<T>
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constructor arguments, <code>make_unique</code> shall perform this
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<a href="#functions">make_unique</a>(<em>args</em>);</code></h3>
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initialization via the expression <code>new T(value)</code> or
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<dl>
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<code>new T(list...)</code> respectively.</p>
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<dt><strong>Effects:</strong></dt>
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<p>When an object of type <code>T</code> is specified to be
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<dd>Allocates storage for an object of type <code>T</code> (or
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value-initialized, <code>make_unique</code> shall perform this
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<code>E[size]</code> when <code>T</code> is <code>E[]</code>, where
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initialization via the expression <code>new T()</code>.</p>
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<code>size</code> is determined from <code>args</code> as specified by
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<p>When an object of type <code>T</code> is specified to be
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the concrete overload). The storage is initialized from
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default-initialized, <code>make_unique_noinit</code> shall perform
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<code>args</code> as specified by the concrete overload. If an exception
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this initialization via the expression <code>new T</code>.</p>
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is thrown, the functions have no effect.</dd>
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</blockquote>
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<dt><strong>Returns:</strong></dt>
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</blockquote>
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<dd>A <code>std::unique_ptr</code> instance that stores and owns the
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<h2><a name="functions">Free Functions</a></h2>
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address of the newly allocated and constructed object.</dd>
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<pre>template<class U, class... Args>
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<dt><strong>Postconditions:</strong></dt>
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unique_ptr<U> make_unique(Args&&... args);</pre>
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<dd><code>r.get() != 0</code>, where <code>r</code> is the return
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<blockquote>
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value.</dd>
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<p><b>Returns:</b> A unique_ptr to an object of type <code>U</code>,
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<dt><strong>Throws:</strong></dt>
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initialized to <code>U(forward<Args>(args)...)</code>.</p>
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<dd><code>std::bad_alloc</code>, or an exception thrown from the
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<p><b>Remarks:</b> This overload shall only participate in overload
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initialization of the object.</dd>
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resolution when <code>U</code> is not an array type.</p>
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<dt><strong>Remarks:</strong></dt>
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<p><b>Examples:</b></p>
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<dd>
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<blockquote>
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<ul>
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<pre>unique_ptr<float> p1 = boost::make_unique<float>();</pre>
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<li>When an object of a scalar type T is specified to be initialized to
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<pre>unique_ptr<point> p2 = boost::make_unique<point>(x, y);</pre>
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a value <code>value</code>, or to <code>T(args...)</code>, where
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</blockquote>
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<code>args...</code> is a list of constructor arguments,
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</blockquote>
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<code>make_unique</code> shall perform this initialization via the
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<pre>template<class U>
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expression <code>new T(value)</code> or <code>new T(args...)</code>
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unique_ptr<U> make_unique(U&& value);</pre>
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respectively.</li>
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<blockquote>
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<li>When an object of type <code>T</code> is specified to be
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<p><b>Returns:</b> A unique_ptr to an object of type <code>U</code>,
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value-initialized, <code>make_unique</code> shall perform this
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initialized to <code>move(value)</code>.</p>
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initialization via the expression <code>new T()</code>.</li>
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<p><b>Remarks:</b> This overload shall only participate in overload
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<li>When an object of type <code>T</code> is specified to be
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resolution when <code>U</code> is not an array type.</p>
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default-initialized, <code>make_unique_noinit</code> shall perform this
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<p><b>Examples:</b></p>
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initialization via the expression <code>new T</code>.</li>
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<blockquote>
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</ul>
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<pre>unique_ptr<string> p1 = boost::make_unique<string>({'a', 'b'});</pre>
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</dd>
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<pre>unique_ptr<point> p2 = boost::make_unique<point>({-10, 25});</pre>
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</dl>
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</blockquote>
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</div>
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</blockquote>
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<div id="functions">
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<pre>template<class U>
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<h2>Free functions</h2>
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unique_ptr<U> make_unique(size_t size);</pre>
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<div>
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<blockquote>
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<h3><code>template<class T, class... Args><br>
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<p><b>Returns:</b> A unique_ptr to a value-initialized object of type
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std::unique_ptr<T>
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<code>T[size]</code>.</p>
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make_unique(Args&&... args);</code></h3>
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<p><b>Remarks:</b> This overload shall only participate in overload
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<dl>
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resolution when <code>U</code> is of the form <code>T[]</code>.</p>
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<dt><strong>Returns:</strong></dt>
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<p><b>Examples:</b></p>
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<dd>A <code>std::unique_ptr</code> to an object of type <code>T</code>,
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<blockquote>
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initialized to <code>std::forward<Args>(args)...</code>.</dd>
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<pre>unique_ptr<double[]> p1 = boost::make_unique<double[]>(4);</pre>
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<dt><strong>Remarks:</strong></dt>
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<pre>unique_ptr<int[][2]> p2 = boost::make_unique<int[][2]>(2);</pre>
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<dd>This overload shall only participate in overload resolution when
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</blockquote>
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<code>T</code> is not an array type.</dd>
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</blockquote>
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</dl>
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<pre>template<class U>
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</div>
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unique_ptr<U> make_unique_noinit();</pre>
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<div>
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<blockquote>
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<h3><code>template<class T><br>std::unique_ptr<T>
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<p><b>Returns:</b> A unique_ptr to a default-initialized object of
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make_unique(<em>T</em>&& value);</code></h3>
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type <code>U</code>.</p>
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<dl>
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<p><b>Remarks:</b> This overload shall only participate in overload
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<dt><strong>Returns:</strong></dt>
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resolution when <code>U</code> is not an array type.</p>
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<dd>A <code>std::unique_ptr</code> to an object of type <code>T</code>,
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<p><b>Examples:</b></p>
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initialized to <code>std::move(value)</code>.</dd>
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<blockquote>
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<dt><strong>Remarks:</strong></dt>
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<pre>unique_ptr<float> p1 = boost::make_unique_noinit<float>();</pre>
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<dd>This overload shall only participate in overload resolution when
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<pre>unique_ptr<point> p2 = boost::make_unique_noinit<point>();</pre>
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<code>T</code> is not an array type.</dd>
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</blockquote>
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</dl>
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</blockquote>
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</div>
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<pre>template<class U>
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<div>
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unique_ptr<U> make_unique_noinit(size_t size);</pre>
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<h3><code>template<class T><br>std::unique_ptr<T>
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<blockquote>
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make_unique(std::size_t size);</code></h3>
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<p><b>Returns:</b> A unique_ptr to a default-initialized object of
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<dl>
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type <code>T[size]</code>.</p>
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<dt><strong>Returns:</strong></dt>
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<p><b>Remarks:</b> This overload shall only participate in overload
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<dd>A <code>std::unique_ptr</code> to a value-initialized object of type
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resolution when <code>U</code> is of the form <code>T[]</code>.</p>
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<code>E[size]</code>.</dd>
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<p><b>Examples:</b></p>
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<dt><strong>Remarks:</strong></dt>
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<blockquote>
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<dd>This overload shall only participate in overload resolution when
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<pre>unique_ptr<double[]> p1 = boost::make_unique_noinit<double[]>(4);</pre>
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<code>T</code> is of the form <code>E[]</code>.</dd>
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<pre>unique_ptr<int[][2]> p2 = boost::make_unique_noinit<int[][2]>(2);</pre>
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</dl>
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</blockquote>
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</div>
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</blockquote>
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<div>
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<h2><a name="history">History</a></h2>
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<h3><code>template<class T><br>std::unique_ptr<T>
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<p>January 2014. Glen Fernandes contributed implementations of
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make_unique_noinit();</code></h3>
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make_unique for objects and arrays.</p>
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<dl>
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<hr>
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<dt><strong>Returns:</strong></dt>
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<p>$Date$</p>
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<dd>A <code>std::unique_ptr</code> to a default-initialized object of
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<p><small>Copyright 2012-2014 Glen Fernandes. Distributed under the
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type <code>T</code>.</dd>
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Boost Software License, Version 1.0. See accompanying file
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<dt><strong>Remarks:</strong></dt>
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<a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at
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<dd>This overload shall only participate in overload resolution when
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<a href="http://www.boost.org/LICENSE_1_0.txt">
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<code>T</code> is not an array type.</dd>
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http://www.boost.org/LICENSE_1_0.txt</a>.</small></p>
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</dl>
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</body>
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</div>
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<div>
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<h3><code>template<class T><br>std::unique_ptr<T>
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make_unique_noinit(std::size_t size);</code></h3>
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<dl>
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<dt><strong>Returns:</strong></dt>
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<dd>A <code>std::unique_ptr</code> to a default-initialized object of
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type <code>E[size]</code>.</dd>
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<dt><strong>Remarks:</strong></dt>
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<dd>This overload shall only participate in overload resolution when
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<code>T</code> is of the form <code>E[]</code>.</dd>
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</dl>
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</div>
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</div>
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<div id="history">
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<h2>History</h2>
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<dl>
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<dt><strong>Boost 1.56</strong></dt>
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<dd>Glen Fernandes contributed implementations of make_unique for
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scalars and arrays</dd>
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</dl>
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</div>
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<hr>
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Copyright 2012-2014 Glen Fernandes. Distributed under the
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<a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License,
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Version 1.0</a>.
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</body>
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</html>
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</html>
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