std::remove_reference
From cppreference.com
| 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
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>(); // 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
| (C++11)
|
checks if a type is either lvalue reference or rvalue reference (class template) |
| (C++11)(C++11)
|
adds lvalue or rvalue reference to the given type (class template) |