| |
template<class T>
struct remove_reference; | If T has type “reference to T1” then the
member typedef type denotes T1;
otherwise, type denotes T. |
template<class T>
struct add_lvalue_reference; | If T is a referenceable type ( [defns.referenceable]) then
the member typedef type denotes T&;
otherwise, type denotes T.[ Note 1: This rule reflects the semantics of reference collapsing ( [dcl.ref]) . — end note] |
template<class T>struct add_rvalue_reference; | If T is a referenceable type then
the member typedef type denotes T&&;
otherwise, type denotes T.[ Note 2: This rule reflects the semantics of reference collapsing ( [dcl.ref]) .For example, when a type T is a reference type T1&,
the type add_rvalue_reference_t<T> is not an rvalue reference . — end note] |