forked from boostorg/move
150 lines
4.5 KiB
C++
150 lines
4.5 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2014. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/move for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_MOVE_MAKE_UNIQUE_HPP_INCLUDED
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#define BOOST_MOVE_MAKE_UNIQUE_HPP_INCLUDED
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#include <boost/move/detail/config_begin.hpp>
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#include <boost/move/detail/workaround.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/move/unique_ptr.hpp>
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#include <cstddef> //for std::size_t
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#include <boost/move/detail/meta_utils.hpp>
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#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#include <boost/preprocessor/iteration/local.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/cat.hpp>
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#endif
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//!\file
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//! Defines "make_unique" functions, which are factories to create instances
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//! of unique_ptr depending on the passed arguments.
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//!
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//! This header can be a bit heavyweight in C++03 compilers due to the use of the
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//! preprocessor library, that's why it's a a separate header from <tt>unique_ptr.hpp</tt>
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namespace boost{
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#if !defined(BOOST_MOVE_DOXYGEN_INVOKED)
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namespace move_detail {
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//Compile time switch between
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//single element, unknown bound array
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//and known bound array
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template<class T>
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struct unique_ptr_if
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{
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typedef ::boost::movelib::unique_ptr<T> t_is_not_array;
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};
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template<class T>
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struct unique_ptr_if<T[]>
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{
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typedef ::boost::movelib::unique_ptr<T[]> t_is_array_of_unknown_bound;
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};
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template<class T, std::size_t N>
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struct unique_ptr_if<T[N]>
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{
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typedef void t_is_array_of_known_bound;
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};
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} //namespace move_detail {
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#endif //!defined(BOOST_MOVE_DOXYGEN_INVOKED)
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namespace movelib {
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#if defined(BOOST_MOVE_DOXYGEN_INVOKED) || !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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//! <b>Remarks</b>: This function shall not participate in overload resolution unless T is not an array.
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//!
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//! <b>Returns</b>: <tt>unique_ptr<T>(new T(std::forward<Args>(args)...))</tt>.
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template<class T, class... Args>
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inline
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#if defined(BOOST_MOVE_DOXYGEN_INVOKED)
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unique_ptr<T>
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#else
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typename ::boost::move_detail::unique_ptr_if<T>::t_is_not_array
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#endif
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make_unique(BOOST_FWD_REF(Args)... args)
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{ return unique_ptr<T>(new T(::boost::forward<Args>(args)...)); }
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#else
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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#define BOOST_MOVE_PP_PARAM_LIST(z, n, data) \
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BOOST_PP_CAT(P, n) && BOOST_PP_CAT(p, n) \
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//!
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#else
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#define BOOST_MOVE_PP_PARAM_LIST(z, n, data) \
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const BOOST_PP_CAT(P, n) & BOOST_PP_CAT(p, n) \
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//!
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#endif //#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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#define BOOST_MOVE_PP_PARAM_FORWARD(z, n, data) \
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::boost::forward< BOOST_PP_CAT(P, n) >( BOOST_PP_CAT(p, n) ) \
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//!
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#define BOOST_MOVE_MAX_CONSTRUCTOR_PARAMETERS 10
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#define BOOST_PP_LOCAL_MACRO(n) \
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template<class T BOOST_PP_ENUM_TRAILING_PARAMS(n, class P) > \
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typename ::boost::move_detail::unique_ptr_if<T>::t_is_not_array \
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make_unique(BOOST_PP_ENUM(n, BOOST_MOVE_PP_PARAM_LIST, _)) \
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{ return unique_ptr<T>(new T(BOOST_PP_ENUM(n, BOOST_MOVE_PP_PARAM_FORWARD, _))); } \
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//!
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#define BOOST_PP_LOCAL_LIMITS (0, BOOST_MOVE_MAX_CONSTRUCTOR_PARAMETERS)
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#include BOOST_PP_LOCAL_ITERATE()
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#endif
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//! <b>Remarks</b>: This function shall not participate in overload resolution unless T is an array of
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//! unknown bound.
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//!
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//! <b>Returns</b>: <tt>unique_ptr<T>(new remove_extent_t<T>[n]())</tt>.
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template<class T>
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inline
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#if defined(BOOST_MOVE_DOXYGEN_INVOKED)
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unique_ptr<T>
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#else
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typename ::boost::move_detail::unique_ptr_if<T>::t_is_array_of_unknown_bound
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#endif
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make_unique(std::size_t n)
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{
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typedef typename ::boost::move_detail::remove_extent<T>::type U;
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return unique_ptr<T>(new U[n]());
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}
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#if defined(BOOST_MOVE_DOXYGEN_INVOKED) || !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS)
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//! <b>Remarks</b>: This function shall not participate in overload resolution unless T is
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//! an array of known bound.
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template<class T, class... Args>
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#if defined(BOOST_MOVE_DOXYGEN_INVOKED)
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unspecified
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#else
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typename ::boost::move_detail::unique_ptr_if<T>::t_is_array_of_known_bound
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#endif
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make_unique(BOOST_FWD_REF(Args) ...) = delete;
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#endif
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} //namespace movelib {
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} //namespace boost{
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#include <boost/move/detail/config_end.hpp>
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#endif //#ifndef BOOST_MOVE_MAKE_UNIQUE_HPP_INCLUDED
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