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std::remove_cvref - cppreference.com

From cppreference.com

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.

If the program adds specializations for std::remove_cvref, the behavior is undefined.

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

Helper types

template< class T > using remove_cvref_t = remove_cvref<T>::type;

 (since C++20)

Possible implementation

template<class T>
struct remove_cvref
{
    using type = std::remove_cv_t<std::remove_reference_t<T>>;
};

Notes

Feature-test macro Value Std Feature
__cpp_lib_remove_cvref 201711L (C++20) std::remove_cvref

Example

#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)>);
}

See also