std::remove_cvref (3) - Linux Manuals

std::remove_cvref: std::remove_cvref

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.

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