std::remove_cvref (3) Linux Manual Page

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.

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;
  };

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
                 (class template)
(C++11)
(C++11)
(C++11)
remove_reference removes a reference from the given type
                 (class template)
(C++11)
decay applies type transformations as when passing a function argument by value
                 (class template)
(C++11)