std::remove_reference (3) Linux Manual Page

std::remove_reference – std::remove_reference

Synopsis

Defined in header<type_traits>

    template <class T>
    (since C++ 11)

        struct remove_reference;

If the type T is a reference type, provides the member typedef type which is the type referred to by T. Otherwise type is T.

Member types

Name Definition
type the type referred by T or T if it is not a reference

Helper types

template< class T > (since C++14)
using remove_reference_t = typename remove_reference<T>::type;

Possible implementation

  template< class T > struct remove_reference {typedef T type;};
  template< class T > struct remove_reference<T&> {typedef T type;};
  template< class T > struct remove_reference<T&&> {typedef T type;};

Example

// Run this code

#include <iostream> // std::cout

#include <type_traits> // std::is_same
template <class T1, class T2>

void print_is_same()
{
    std::cout << std::is_same<T1, T2>() << '\n';
}
int main()
{
    std::cout << std::boolalpha;
    print_is_same<int, int>();
    print_is_same<int, int &>();
    print_is_same<int, int &&>();
    print_is_same<int, std::remove_reference<int>::type>();
    print_is_same<int, std::remove_reference<int &>::type>();
    print_is_same<int, std::remove_reference<int &&>::type>();
}

Output:

  true
  false
  false
  true
  true
  true

See also

is_reference checks if a type is either a lvalue reference or rvalue reference
                     (class template)
(C++11)
add_lvalue_reference
add_rvalue_reference adds a lvalue or rvalue reference to the given type
                     (class template)
(C++11)
(C++11)
remove_cvref combines std::remove_cv and std::remove_reference
                     (class template)
(C++20)