20 General utilities library [utilities]

20.15 Metaprogramming and type traits [meta]

20.15.8 Transformations between types [meta.trans]

20.15.8.3 Reference modifications [meta.trans.ref]

Table 55: Reference modifications [tab:meta.trans.ref]
Template
Comments
template<class T>
struct remove_­reference;
If T has type β€œreference to T1” then the member typedef type names T1; otherwise, type names T.
template<class T>
struct add_­lvalue_­reference;
If T names a referenceable type then the member typedef type names T&; otherwise, type names T.
[Note 1:
This rule reflects the semantics of reference collapsing ([dcl.ref]).
β€” end note]
template<class T>
struct add_­rvalue_­reference;
If T names a referenceable type then the member typedef type names T&&; otherwise, type names T.
[Note 2:
This rule reflects the semantics of reference collapsing ([dcl.ref]).
For example, when a type T names a type T1&, the type add_­rvalue_­reference_­t<T> is not an rvalue reference.
β€” end note]