std::experimental::ranges::Regular
From cppreference.com
< cpp | experimental | ranges
| Defined in header <experimental/ranges/concepts>
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| template< class T > concept bool Regular = Semiregular<T> && EqualityComparable<T>; |
(ranges TS) | |
The Regular concept specifies that a type is regular, that is, it is copyable, default constructible, and equality comparable. It is satisfied by types that behave similarly to built-in types like int, and that are comparable with ==.