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Reduced dependencies with type_traits. Updated "forward" to be standard conforming.

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This commit is contained in:
Ion Gaztañaga
2014-08-03 21:26:46 +02:00
parent acbf002199
commit d45f2cd734
2 changed files with 37 additions and 14 deletions
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23
include/boost/move/detail/meta_utils.hpp
View File

@@ -120,6 +120,29 @@ struct is_lvalue_reference<T&>
: public integral_constant<bool, true>
{};
//remove_reference
template<class T>
struct remove_reference
{
typedef T type;
};
template<class T>
struct remove_reference<T&>
{
typedef T type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T>
struct remove_reference<T&&>
{
typedef T type;
};
#endif
template<class T>
struct is_class_or_union
{

28
include/boost/move/utility.hpp
View File

@@ -17,6 +17,7 @@
#include <boost/move/detail/config_begin.hpp>
#include <boost/move/core.hpp>
#include <boost/move/detail/meta_utils.hpp>
#include <boost/static_assert.hpp>
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_MOVE_DOXYGEN_INVOKED)
@@ -96,8 +97,6 @@
#else //!BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE
#include <boost/type_traits/remove_reference.hpp>
namespace boost {
//! This trait's internal boolean `value` is false in compilers with rvalue references
@@ -129,14 +128,14 @@
//Old move approach, lvalues could bind to rvalue references
template <class T>
inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
inline typename ::boost::move_detail::remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
{ return t; }
#else //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES
template <class T>
inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
{ return static_cast<typename remove_reference<T>::type &&>(t); }
inline typename ::boost::move_detail::remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
{ return static_cast<typename ::boost::move_detail::remove_reference<T>::type &&>(t); }
#endif //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES
@@ -170,17 +169,18 @@
#else //Old move
//Implementation #5 from N2951, thanks to Howard Hinnant
template <class T, class U>
inline T&& forward(U&& t
, typename ::boost::move_detail::enable_if_c<
move_detail::is_lvalue_reference<T>::value ? move_detail::is_lvalue_reference<U>::value : true>::type * = 0/*
, typename ::boost::move_detail::enable_if_c<
move_detail::is_convertible
<typename remove_reference<U>::type*, typename remove_reference<T>::type*>::value>::type * = 0*/) BOOST_NOEXCEPT
template <class T>
inline T&& forward(typename ::boost::move_detail::remove_reference<T>::type& t) BOOST_NOEXCEPT
{ return static_cast<T&&>(t); }
template <class T>
inline T&& forward(typename ::boost::move_detail::remove_reference<T>::type&& t) BOOST_NOEXCEPT
{
//"boost::forward<T> error: 'T' is a lvalue reference, can't forward as rvalue.";
BOOST_STATIC_ASSERT(!boost::move_detail::is_lvalue_reference<T>::value);
return static_cast<T&&>(t);
}
#endif //BOOST_MOVE_DOXYGEN_INVOKED
} //namespace boost {