因为一个个API的原型写过去怪麻烦和易错。只是，遇上这种情况，不要和 std::function 配合就好，——...
DRApplied toBehavior as publishedCorrect behavior LWG 2591C++11the behavior is undefined ifTis notCallablebehavior is defined (always returnsnullptr) See also target_type obtains thetypeidof the stored target (public member function)
std::function模板类成员函数声明 typedef _Rp result_type; // construct/copy/destroy: _LIBCPP_INLINE_VISIBILITY function() _NOEXCEPT { } _LIBCPP_INLINE_VISIBILITY function(nullptr_t) _NOEXCEPT {} function(const function&); function(function&&) _NOEXCEPT; template<class _Fp, class = _EnableIf...
target obtains a pointer to the stored target (public member function) Non-member functions std::swap(std::function) (C++11) specializes thestd::swapalgorithm (function template) operator==operator!= (removed in C++20) compares astd::functionwithnullptr ...
target_type 获得所存储目标的typeid (公开成员函数) target 获得指向所存储目标的指针 (公开成员函数) 非成员函数 std::swap(std::function) (C++11) 特化std::swap算法 (函数模板) operator==operator!= (C++20 移除) 比较std::function和nullptr
typedefstd::function<int(int)> print_func; print_func F_print; public: voidsetPrint(print_func fun) { F_print = fun; F_print(10); } intpritf(inti) { cout << i << endl; return0; } }; #define CALLBACK_0(__selector__,__target__,...) bind(__selector__,__target__,#...
{ return nullptr; } else { return ::new (_Where) _Func_impl_no_alloc(_STD move(_Callee)); } } _Rx _Do_call(_Types&&... _Args) override { // call wrapped function return _Invoker_ret<_Rx>::_Call(_Callee, _STD forward<_Types>(_Args)...); } const void* _Get() const ...
因为可以直接这么写:std::function<void(Foo*)> ff = [](Foo* foo){ foo->f1() };...
function&operator=(nullptr_t) _NOEXCEPT; template<class_Fp,class= _EnableIfCallable<_Fp>> function&operator=(_Fp&&); ~function(); // function modifiers: voidswap(function&)_NOEXCEPT; #if_LIBCPP_STD_VER <= 14 template<class_Fp,class_Alloc> ...
2.在int main()后都是“using names 分享31赞 c++吧 cloud444733905 std::function::target 实现的bug原实现为: template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes> const void* __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::target(const type_info& __ti) const _NOEXCEPT { ...