Defined in header <type_traits> | ||
|---|---|---|
template< class T > struct remove_cvref; | (since C++20) |
If the type T is a reference type, provides the member typedef type which is the type referred to by T with its topmost cv-qualifiers removed. Otherwise type is T with its topmost cv-qualifiers removed.
| Name | Definition |
|---|---|
type | the type referred by T or T itself if it is not a reference, with top-level cv-qualifiers removed |
template< class T > using remove_cvref_t = typename remove_cvref<T>::type; | (since C++20) |
template< class T >
struct remove_cvref {
typedef std::remove_cv_t<std::remove_reference_t<T>> type;
}; |
#include <iostream>
#include <type_traits>
int main()
{
std::cout << std::boolalpha
<< std::is_same_v<std::remove_cvref_t<int>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<int&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<int&&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int&>, int> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int[2]>, int[2]> << '\n'
<< std::is_same_v<std::remove_cvref_t<const int(&)[2]>, int[2]> << '\n'
<< std::is_same_v<std::remove_cvref_t<int(int)>, int(int)> << '\n';
}Output:
true true true true true true true
|
(C++11)(C++11)(C++11) | removes const or/and volatile specifiers from the given type (class template) |
|
(C++11) | removes a reference from the given type (class template) |
|
(C++11) | applies type transformations as when passing a function argument by value (class template) |
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