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std::remove_reference

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Defined in header <type_traits>
template< class T >
struct remove_reference;
(since C++11)

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.

Contents

[edit] Member types

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

[edit] Helper types

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

[edit] 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;};

[edit] Example

#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>();    // true
  print_is_same<int, int &>();  // false
  print_is_same<int, int &&>(); // false
 
  print_is_same<int, std::remove_reference<int>::type>();    // true
  print_is_same<int, std::remove_reference<int &>::type>();  // true
  print_is_same<int, std::remove_reference<int &&>::type>(); // true
}

Output:

true
false
false
true
true
true

[edit] See also

checks if a type is either lvalue reference or rvalue reference
(class template) [edit]
adds lvalue or rvalue reference to the given type
(class template) [edit]