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std::same_as

From cppreference.com
< cpp‎ | concepts
Defined in header <concepts>
template < class T, class U >
concept same_as = /* see below */;
(since C++20)

The concept same_as<T, U> is satisfied if and only if T and U denote the same type.

std::same_as<T, U> subsumes std::same_as<U, T> and vice versa.

[edit] Possible implementation

namespace detail {
    template< class T, class U >
    concept SameHelper = std::is_same_v<T, U>;
}
 
template< class T, class U >
concept same_as = detail::SameHelper<T, U> && detail::SameHelper<U, T>;

[edit] See also

(C++11)
checks if two types are the same
(class template) [edit]