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23 General utilities library [utilities] 23.15 Metaprogramming and type traits [meta] 23.15.7 Transformations between types [meta.trans] 23.15.7.2 Reference modifications [meta.trans.ref]
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— Reference modifications
Template Comments template <class T>
struct remove_reference; If T has type “reference 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: This rule reflects the semantics of reference collapsing ([dcl.ref]). — 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: 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. — end note ]
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