std::add_cv, std::add_const, std::add_volatile

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Defined in header <type_traits>

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template< class T >
struct add_cv;

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<td > (1) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

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template< class T >
struct add_const;

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<td > (2) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

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template< class T >
struct add_volatile;

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Provides the member typedef type which is the same as T, except it has a cv-qualifier added (unless T is a function, a reference, or already has this cv-qualifier)

1) adds both const and volatile

2) adds const

3) adds volatile

Member types

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See also

is_const (C++11)	checks if a type is const-qualified (class template)
is_volatile (C++11)	checks if a type is volatile-qualified (class template)
remove_cvremove_constremove_volatile (C++11)(C++11)(C++11)	removes const and/or volatile specifiers from the given type (class template)