NAME

std::remove_cvref - std::remove_cvref

Synopsis

Defined in header <type_traits>
template< class T > (since C++20)
struct remove_cvref;

If the type T is a reference type, provides the member typedef type which is the
type referred to by T with its topmost cv-qualifiers removed. Otherwise type is T
with its topmost cv-qualifiers removed.

The behavior of a program that adds specializations for remove_cvref is undefined.

Member types

Name Definition
type the type referred by T or T itself if it is not a reference, with top-level
cv-qualifiers removed

Helper types

template< class T > (since C++20)
using remove_cvref_t = typename remove_cvref<T>::type;

Possible implementation

template< class T >
struct remove_cvref {
typedef std::remove_cv_t<std::remove_reference_t<T>> type;
};

Notes

Feature-test macro: __cpp_lib_remove_cvref

Example

// Run this code

#include <iostream>
#include <type_traits>

int main()
{
std::cout << std::boolalpha
<< std::is_same_v<std::remove_cvref_t<int>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<int&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<int&&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int[2]>, int[2]> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int(&)[2]>, int[2]> << '\n'
<< std::is_same_v<std::remove_cvref_t<int(int)>, int(int)> << '\n';
}

Output:

true
true
true
true
true
true
true

See also

remove_cv
remove_const
remove_volatile removes const or/and volatile specifiers from the given type
(C++11) (class template)
(C++11)
(C++11)
remove_reference removes a reference from the given type
(C++11) (class template)
decay applies type transformations as when passing a function argument by
(C++11) value
(class template)