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Use std::reference_wrapper

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This commit is contained in:
Peter Dimov
2019-11-05 18:48:15 +02:00
parent 259587da7f
commit a21f594af6
1 changed files with 86 additions and 0 deletions
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86
include/boost/core/ref.hpp
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@ -7,6 +7,90 @@
# pragma once # pragma once
#endif #endif
#if 1
#include <boost/config.hpp>
#include <functional>
namespace boost
{
using std::reference_wrapper;
using std::ref;
using std::cref;
// is_reference_wrapper
template<typename T> struct is_reference_wrapper
{
BOOST_STATIC_CONSTANT( bool, value = false );
};
template<typename T> struct is_reference_wrapper< reference_wrapper<T> >
{
BOOST_STATIC_CONSTANT( bool, value = true );
};
template<typename T> struct is_reference_wrapper< reference_wrapper<T> const >
{
BOOST_STATIC_CONSTANT( bool, value = true );
};
template<typename T> struct is_reference_wrapper< reference_wrapper<T> volatile >
{
BOOST_STATIC_CONSTANT( bool, value = true );
};
template<typename T> struct is_reference_wrapper< reference_wrapper<T> const volatile >
{
BOOST_STATIC_CONSTANT( bool, value = true );
};
// unwrap_reference
template<typename T> struct unwrap_reference
{
typedef T type;
};
template<typename T> struct unwrap_reference< reference_wrapper<T> >
{
typedef T type;
};
template<typename T> struct unwrap_reference< reference_wrapper<T> const >
{
typedef T type;
};
template<typename T> struct unwrap_reference< reference_wrapper<T> volatile >
{
typedef T type;
};
template<typename T> struct unwrap_reference< reference_wrapper<T> const volatile >
{
typedef T type;
};
// unwrap_ref
template<class T> BOOST_FORCEINLINE typename unwrap_reference<T>::type& unwrap_ref( T & t )
{
return t;
}
// get_pointer
template<class T> BOOST_FORCEINLINE T* get_pointer( reference_wrapper<T> const & r )
{
return std::addressof( r.get() );
}
} // namespace boost
#else
#include <boost/config.hpp> #include <boost/config.hpp>
#include <boost/config/workaround.hpp> #include <boost/config/workaround.hpp>
#include <boost/core/addressof.hpp> #include <boost/core/addressof.hpp>
@ -299,4 +383,6 @@ template<class T> BOOST_FORCEINLINE T* get_pointer( reference_wrapper<T> const &
} // namespace boost } // namespace boost
#endif
#endif // #ifndef BOOST_CORE_REF_HPP #endif // #ifndef BOOST_CORE_REF_HPP