std::remove_cv, std::remove_const, std::remove_volatile

Since C++11

Header: <type_traits>

Provides the member typedef type which is the same as T, except that its topmost cv-qualifiers are removed.

# Declarations

template< class T >
struct remove_cv;

(since C++11)

template< class T >
struct remove_const;

(since C++11)

template< class T >
struct remove_volatile;

(since C++11)

# Example

#include <type_traits>
 
template<typename U, typename V>
constexpr bool same = std::is_same_v<U, V>;
 
static_assert
(
    same<std::remove_cv_t<int>, int> &&
    same<std::remove_cv_t<const int>, int> &&
    same<std::remove_cv_t<volatile int>, int> &&
    same<std::remove_cv_t<const volatile int>, int> &&
    // remove_cv only works on types, not on pointers
    not same<std::remove_cv_t<const volatile int*>, int*> &&
    same<std::remove_cv_t<const volatile int*>, const volatile int*> &&
    same<std::remove_cv_t<const int* volatile>, const int*> &&
    same<std::remove_cv_t<int* const volatile>, int*>
);
 
int main() {}

# See also