std::assignable_from(3) C++ Standard Libary std::assignable_from(3) NAME std::assignable_from - std::assignable_from Synopsis Defined in header <concepts> template< class LHS, class RHS > concept assignable_from = std::is_lvalue_reference_v<LHS> && std::common_reference_with< const std::remove_reference_t<LHS>&, (since C++20) const std::remove_reference_t<RHS>&> && requires(LHS lhs, RHS&& rhs) { { lhs = std::forward<RHS>(rhs) } -> std::same_as<LHS>; }; The concept assignable_from<LHS, RHS> specifies that an expression of the type and value category specified by RHS can be assigned to an lvalue expression whose type is specified by LHS. Notes Assignment need not be a total function. In particular, if assigning to some object x can cause some other object y to be modified, then x = y is likely not in the domain of =. This typically happens if the right operand is owned di- rectly or indirectly by the left operand (e.g., with smart pointers to nodes in a node-based data structure, or with something like std::vector<std::any>). See also is_assignable is_trivially_assignable checks if a type has an assignment operator for a specific is_nothrow_assignable argument (C++11) (class template) (C++11) (C++11) http://cppreference.com 2024.06.10 std::assignable_from(3)
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