copy_reference_

template<class T, class U>
struct copy_reference
{
    typedef see-below type;
};

template<class T, class U>
using copy_reference_t = typename copy_reference<T, U>::type;

type: T ref, where ref are the ref-qualifiers of U.

Header: #include <boost/type_traits/copy_reference.hpp> or #include <boost/type_traits.hpp>>

Table 1.19. Examples

Expression	Result Type
`copy_reference<int, char>::type`	`int`
`copy_reference<int, char&>::type`	`int&`
`copy_reference<int, char&&>::type`	`int&&`
`copy_reference<int&, char>::type`	`int&`
`copy_reference<int&, char&>::type`	`int&`
`copy_reference<int&, char&&>::type`	`int&`
`copy_reference<int&&, char>::type`	`int&&`
`copy_reference<int&&, char&>::type`	`int&`
`copy_reference<int&&, char&&>::type`	`int&&`

Compiler Compatibility: All current compilers are supported by this trait. The type alias copy_reference_t is only available if the compiler supports template aliases.

Boost C++ Libraries

copy_reference_