| 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.
| Name | Definition |
|---|---|
type | the type referred by T or T if it is not a reference |
template< class T > using remove_reference_t = typename remove_reference<T>::type; | (since C++14) |
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;}; |
#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
| (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) |
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