std::remove_reference (3) - Linux Manuals

std::remove_reference: std::remove_reference

NAME

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