template< class T >
struct remove_cvref;
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.
If the program adds specializations for std::remove_cvref, the behavior is undefined.
type the type referred by T or T itself if it is not a reference, with top-level cv-qualifiers removed [edit] Helper types
template< class T >
using remove_cvref_t = remove_cvref<T>::type;
#include <type_traits>
int main()
{
static_assert(std::is_same_v<std::remove_cvref_t<int>, int>);
static_assert(std::is_same_v<std::remove_cvref_t<int&>, int>);
static_assert(std::is_same_v<std::remove_cvref_t<int&&>, int>);
static_assert(std::is_same_v<std::remove_cvref_t<const int&>, int>);
static_assert(std::is_same_v<std::remove_cvref_t<const int[2]>, int[2]>);
static_assert(std::is_same_v<std::remove_cvref_t<const int(&)[2]>, int[2]>);
static_assert(std::is_same_v<std::remove_cvref_t<int(int)>, int(int)>);
}[edit] See also
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