std::pointer_to_unary_function From cppreference.com <cpp |utility |functional Function objects template< classArg, classResult >classpointer_to_unary_function:publicstd::unary_function<Arg, Result>; (deprecated in C++11) (removed in C++17) ...
1template<typename _Arg, typename _Result>2inline pointer_to_unary_function<_Arg, _Result> ptr_fun(_Result (*__x)(_Arg))3{4returnpointer_to_unary_function<_Arg, _Result>(__x);5}67template<typename _Arg, typename _Result>8classpointer_to_unary_function :publicunary_function<_Arg, _R...
struct luaCFunctionDispatcher<CallType::POINTER_TO_FUNCTION, false, _CallableType, IntegerSequence<index...> > { }; //模板特化, 成员函数指针, 返回void template<class _CallableType, size_t ... index> struct luaCFunctionDispatcher<CallType::POINTER_TO_MEMBER_FUNCTION, true, _CallableType, Integer...
typedef Ret function_type(Args...);//typedef Ret return_type;usingreturn_type =Ret;usingstl_function_type = std::function<function_type>; typedef Ret (*pointer)(Args...); template<size_t I>structargs { static_assert(I<arity,"index is out of range, index must less than sizeof Args"...
NativeObject* object = ConvertNativeValueTo<NativeObject>(objValue); if (object == nullptr) { HILOG_WARN("invalid object"); return objValue; } auto jsContext = std::make_unique<JsBaseContext>(context); SetNameNativePointer(engine, *object, BASE_CONTEXT_NAME, jsContext.release(), JsBaseCo...
{CMAKE_CPP_FLAGS} -DNDEBUG -O2 -D__const__=__unused__ -pipe -W -Wall -Wno-unused-parameter -fPIC -fno-omit-frame-pointer") if(CMAKE_VERSION VERSION_LESS "3.1.3") if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU") set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11") endif() if...
Pointers to functions A pointer to function can be initialized with an address of a function. Because of thefunction-to-pointerconversion, the address-of operator is optional: voidf(int);void(*pf1)(int)=&f;void(*pf2)(int)=f;// same as &f ...
insert(std::make_unique<Derived>()); UniquePointerSet<Base> destination; destination.insert(begin(source), end(source)); 但是会出错: error: use of deleted function 'std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = Base; _Dp = std::default...
空指针可以用来指示对象不存在(例如 std::function::target()),或作为其他错误条件的指示器(例如 dynamic_cast)。通常,接受指针实参的函数始终需要检查值是否为空,并以不同方式处理该情况(例如,delete 表达式在传递空指针时不做任何事)。 无效指针如果满足以下任一条件,那么指针值 p 在某个求值 e 的语境中有效:...
block for a rethrown exception pointer, an uncaught exception will end up causing the server crash. Be careful! Pre routing handler svr.set_pre_routing_handler([](const auto& req, auto& res) { if (req.path == "/hello") { res.set_content("world", "text/html"); return Server::Hand...