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std::indirectly_readable(3) C++ Standard Libary std::indirectly_readable(3) NAME std::indirectly_readable - std::indirectly_readable Synopsis Defined in header <iterator> template< class In > concept __IndirectlyReadableImpl = // exposition only requires(const In in) { typename std::iter_value_t<In>; typename std::iter_reference_t<In>; typename std::iter_rvalue_reference_t<In>; { *in } -> std::same_as<std::iter_reference_t<In>>; { ranges::iter_move(in) } -> std::same_as<std::iter_rvalue_reference_t<In>>; } && (since C++20) std::common_reference_with< std::iter_reference_t<In>&&, std::iter_value_t<In>& > && std::common_reference_with< std::iter_reference_t<In>&&, std::iter_rvalue_reference_t<In>&& > && std::common_reference_with< std::iter_rvalue_reference_t<In>&&, const std::iter_value_t<In>& >; template< class In > concept indirectly_readable = (since C++20) __IndirectlyReadableImpl<std::remove_cvref_t<In>>; The concept indirectly_readable is modeled by types that are read- able by applying operator*, such as pointers, smart pointers, and input iterators. Semantic requirements Given a value i of type I, I models indirectly_readable only if all concepts it subsumes are modeled and the expression *i is equality preserving. Equality preservation An expression is equality preserving if it results in equal outputs given equal inputs. * The inputs to an expression consist of its operands. * The outputs of an expression consist of its result and all operands modified by the expression (if any). In specification of standard concepts, operands are defined as the largest subexpressions that include only: * an id-expression, and * invocations of std::move, std::forward, and std::declval. The cv-qualification and value category of each operand is deter- mined by assuming that each template type parameter denotes a cv-unqualified complete non-array object type. Every expression required to be equality preserving is further re- quired to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects. Unless noted otherwise, every expression used in a requires-expres- sion is required to be equality preserving and stable, and the evaluation of the ex- pression may modify only its non-constant operands. Operands that are constant must not be modified. http://cppreference.com 2022.07.31 std::indirectly_readable(3)
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