std::assignable_from(3) Library Functions Manual std::assignable_from(3)

std::assignable_from - [concept.assignable], concept assignable_from

#include <concepts>

template<typename _Lhs, typename _Rhs>
concept std::assignable_from =  is_lvalue_reference_v<_Lhs>
      && common_reference_with<__detail::__cref<_Lhs>, __detail::__cref<_Rhs>>
      && requires(_Lhs __lhs, _Rhs&& __rhs) {
        { __lhs = static_cast<_Rhs&&>(__rhs) } -> same_as<_Lhs>;
      }

[concept.assignable], concept assignable_from

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