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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>make_unique</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body text="#000000" bgcolor="#ffffff" link="#0000ff" vlink="#0000ff"> <h1><img height="86" alt="boost.png (6897 bytes)" src="../../boost.png" width="277" align="middle" border="0">make_unique</h1> <a href="#introduction">Introduction</a> <a href="#synopsis">Synopsis</a> <a href="#common">Common Requirements</a> <a href="#functions">Free Functions</a> <a href="#history">History</a> <h2><a name="introduction">Introduction</a></h2> The header file <boost/make_unique.hpp> provides overloaded function template <code>make_unique</code> for convenient creation of <code>unique_ptr</code> objects. <h2><a name="synopsis">Synopsis</a></h2> <pre>namespace boost { template<class U> // U is not array unique_ptr <a href="#functions">make_unique</a>(); #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) template<class U, class... Args> // U is not array unique_ptr <a href="#functions">make_unique</a>(Args&&... args); #endif template<class U> // U is not array unique_ptr <a href="#functions">make_unique</a>(U&& value); template<class U> // U is T[] unique_ptr <a href="#functions">make_unique</a>(size_t size); template<class U> // U is not array unique_ptr <a href="#functions">make_unique_noinit</a>(); template<class U> // U is T[] unique_ptr <a href="#functions">make_unique_noinit</a>(size_t size); }</pre> <h2><a name="common">Common Requirements</a></h2> <pre>template<class U> unique_ptr make_unique(args); template<class U> unique_ptr make_unique_noinit(args);</pre> <blockquote> Effects: Allocates memory for an object of type <code>U</code> (or <code>T[size]</code> when <code>U</code> is <code>T[]</code>, where <code>size</code> is determined from <code>args</code> as specified by the concrete overload). The object is initialized from <code>args</code> as specified by the concrete overload. If an exception is thrown, the functions have no effect. Returns: A <code>unique_ptr</code> instance that stores and owns the address of the newly constructed object. Postconditions: <code>r.get() != 0</code>, where <code>r</code> is the return value. Throws: <code>bad_alloc</code>, or an exception thrown from the initialization of the object. Remarks: <blockquote> When an object of a non-array type <code>T</code> is specified to be initialized to a value <code>value</code>, or to <code>T(list...)</code>, where <code>list...</code> is a list of constructor arguments, <code>make_unique</code> shall perform this initialization via the expression <code>new T(value)</code> or <code>new T(list...)</code> respectively. When an object of type <code>T</code> is specified to be value-initialized, <code>make_unique</code> shall perform this initialization via the expression <code>new T()</code>. When an object of type <code>T</code> is specified to be default-initialized, <code>make_unique_noinit</code> shall perform this initialization via the expression <code>new T</code>. </blockquote> </blockquote> <h2><a name="functions">Free Functions</a></h2> <pre>template<class U, class... Args> unique_ptr make_unique(Args&&... args);</pre> <blockquote> Returns: A unique_ptr to an object of type <code>U</code>, initialized to <code>U(forward<Args>(args)...)</code>. Remarks: This overload shall only participate in overload resolution when <code>U</code> is not an array type. Examples: <blockquote> <pre>unique_ptr<float> p1 = boost::make_unique<float>(); unique_ptr<point> p2 = boost::make_unique<point>(x, y);</pre> </blockquote> </blockquote> <pre>template<class U> unique_ptr make_unique(U&& value);</pre> <blockquote> Returns: A unique_ptr to an object of type <code>U</code>, initialized to <code>move(value)</code>. Remarks: This overload shall only participate in overload resolution when <code>U</code> is not an array type. Examples: <blockquote> <pre>unique_ptr<string> p1 = boost::make_unique<string>({'a', 'b'}); unique_ptr<point> p2 = boost::make_unique<point>({-10, 25});</pre> </blockquote> </blockquote> <pre>template<class U> unique_ptr make_unique(size_t size);</pre> <blockquote> Returns: A unique_ptr to a value-initialized object of type <code>T[size]</code>. Remarks: This overload shall only participate in overload resolution when <code>U</code> is of the form <code>T[]</code>. Examples: <blockquote> <pre>unique_ptr<double[]> p1 = boost::make_unique<double[]>(4); unique_ptr<int[][2]> p2 = boost::make_unique<int[][2]>(2);</pre> </blockquote> </blockquote> <pre>template<class U> unique_ptr make_unique_noinit();</pre> <blockquote> Returns: A unique_ptr to a default-initialized object of type <code>U</code>. Remarks: This overload shall only participate in overload resolution when <code>U</code> is not an array type. Examples: <blockquote> <pre>unique_ptr<float> p1 = boost::make_unique_noinit<float>(); unique_ptr<point> p2 = boost::make_unique_noinit<point>();</pre> </blockquote> </blockquote> <pre>template<class U> unique_ptr make_unique_noinit(size_t size);</pre> <blockquote> Returns: A unique_ptr to a default-initialized object of type <code>T[size]</code>. Remarks: This overload shall only participate in overload resolution when <code>U</code> is of the form <code>T[]</code>. Examples: <blockquote> <pre>unique_ptr<double[]> p1 = boost::make_unique_noinit<double[]>(4); unique_ptr<int[][2]> p2 = boost::make_unique_noinit<int[][2]>(2);</pre> </blockquote> </blockquote> <h2><a name="history">History</a></h2> January 2014. Glen Fernandes contributed implementations of make_unique for objects and arrays. <hr> $Date$ Copyright 2012-2014 Glen Fernandes. Distributed under the Boost Software License, Version 1.0. See accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt"> http://www.boost.org/LICENSE_1_0.txt</a>. </body> </html>