std::remove_cvref
Defined in header <type_traits>
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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.
Member types
Name | Definition |
type
|
the type referred by T or T itself if it is not a reference, with top-level cv-qualifiers removed
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Helper types
template< class T > using remove_cvref_t = typename remove_cvref<T>::type; |
(since C++20) | |
Possible implementation
template< class T > struct remove_cvref { typedef std::remove_cv_t<std::remove_reference_t<T>> type; }; |
Example
Run this code
#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
See also
(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) |