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    std::remove_cvref

    From cppreference.com
     
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    Defined in header <type_traits>
    template< class T > struct remove_cvref;
    		 (since C++20)
    See More

    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

    Run this code
    #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

    (C++11)(C++11)(C++11)
    		 removes const and/or volatile specifiers from the given type
    (class template) [edit]
    (C++11)
    		 removes a reference from the given type
    (class template) [edit]
    (C++11)
    		 applies type transformations as when passing a function argument by value
    (class template) [edit]