std::add_cv, std::add_const, std::add_volatile
From cppreference.com
Defined in header
<type_traits>
|
||
template< class T >
struct add_cv; |
(1) | (since C++11) |
template< class T >
struct add_const; |
(2) | (since C++11) |
template< class T >
struct add_volatile; |
(3) | (since C++11) |
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
Contents |
[edit] Member types
Name | Definition |
type
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the type T with the cv-qualifier
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[edit] Helper types
template< class T >
using add_cv_t = typename add_cv<T>::type; |
(since C++14) | |
template< class T >
using add_const_t = typename add_const<T>::type; |
(since C++14) | |
template< class T >
using add_volatile_t = typename add_volatile<T>::type; |
(since C++14) | |
[edit] Possible implementation
template< class T > struct add_cv { typedef typename std::add_volatile<typename std::add_const<T>::type>::type type; }; template< class T> struct add_const { typedef const T type; }; template< class T> struct add_volatile { typedef volatile T type; }; |
[edit] Example
Run this code
Output:
Non-cv Const
[edit] See also
(C++11)
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checks if a type is const-qualified (class template) |
(C++11)
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checks if a type is volatile-qualified (class template) |
(C++11)(C++11)(C++11)
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removes const or/and volatile specifiers from the given type (class template) |