NAME¶

std::remove_cvref - std::remove_cvref

Synopsis¶

Defined in header <type_traits>
template< class T > (since C++20)
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.

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 > (since C++20)
using remove_cvref_t = remove_cvref<T>::type;

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¶

remove_cv
remove_const
remove_volatile removes const and/or volatile specifiers from the given type
(C++11) (class template)
(C++11)
(C++11)
remove_reference removes a reference from the given type
(C++11) (class template)
decay applies type transformations as when passing a function argument by
(C++11) value
(class template)