?? concept_map_test.cpp
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#include <concepts>auto concept BinaryIsoFunction<typename Operation, typename Element>// : std::Callable2<Operation, Element, Element>{ where std::Callable2<Operation, Element, Element>; where std::Convertible<std::Callable2<Operation, Element, Element>::result_type, Element>; typename result_type = std::Callable2<Operation, Element, Element>::result_type;};// auto concept Magma<typename Operation, typename Element> : BinaryIsoFunction<Operation, Element>{ where std::Assignable<Element>; where std::Assignable<Element, BinaryIsoFunction<Operation, Element>::result_type>;};template <typename Element>struct add{ Element operator() (const Element& x, const Element& y) { return x + y; }};// auto concept AdditiveMagma<typename Element> : Magma< add<Element>, Element >{ // where Magma< add<Element>, Element >; typename assign_result_type; assign_result_type operator+=(Element& x, Element y); // Operator + is by default defined with += typename result_type; result_type operator+(Element& x, Element y);#if 0 { Element tmp(x); return tmp += y; defaults NYS }#endif // Type consistency with Magma where std::SameType< result_type, Magma< add<Element>, Element >::result_type>; axiom Consistency(add<Element> op, Element x, Element y) { op(x, y) == x + y; // Might change later x + y == x += y; // Element tmp = x; tmp+= y; tmp == x + y; not proposal-compliant } }// concept_map Magma< add<int>, int> {}concept_map AdditiveMagma<int> {}int main() { return 0;}?? 快捷鍵說明
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