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Showing content from https://en.cppreference.com/w/cpp/algorithm/../types/decay.html below:

std::decay - cppreference.com

template< class T > struct decay;

(since C++11)

Performs the type conversions equivalent to the ones performed when passing function arguments by value. Formally:

If T is âarray of Uâ or reference to it, the member typedef type is U*.

Otherwise, if T is a function type F or reference to one, the member typedef type is std::add_pointer<F>::type.

Otherwise, the member typedef type is std::remove_cv<std::remove_reference<T>::type>::type.

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

[edit] Member types Name Definition type the result of applying the decay type conversions to T [edit] Helper types

template< class T > using decay_t = typename decay<T>::type;

(since C++14) [edit] Possible implementation [edit] Example

#include <type_traits>
 
template<typename T, typename U>
constexpr bool is_decay_equ = std::is_same_v<std::decay_t<T>, U>;
 
static_assert
(
    is_decay_equ<int, int> &&
    ! is_decay_equ<int, float> &&
    is_decay_equ<int&, int> &&
    is_decay_equ<int&&, int> &&
    is_decay_equ<const int&, int> &&
    is_decay_equ<int[2], int*> &&
    ! is_decay_equ<int[4][2], int*> &&
    ! is_decay_equ<int[4][2], int**> &&
    is_decay_equ<int[4][2], int(*)[2]> &&
    is_decay_equ<int(int), int(*)(int)>
);
 
int main() {}

[edit] See also

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