function::swap function::assign (until C++17) function::operator bool function::operator() function::target_type function::target Non-member functions operator==operator!= (until C++20) swap(std::function) Helpe
function::swap function::assign (until C++17) function::operator bool function::operator() function::target_type function::target Non-member functions operator==operator!= (until C++20) swap(std::function) Helper classes uses_allocator<std::function> (until C++17) Deduction guides(C++17) Define...
std::function_ref Defined in header<functional> template<class...> classfunction_ref;// not defined (1)(since C++26) template<classR,class...Args> classfunction_ref<R(Args...)>; template<classR,class...Args> classfunction_ref<R(Args...)noexcept>; ...
#include <functional>#include <iostream>usingSomeVoidFunc=std::function<void(int)>;classC{public:C(SomeVoidFunc void_func=nullptr):void_func_(void_func){if(void_func_==nullptr)// specialized compare with nullptrvoid_func_=std::bind(&C::default_func, this, std::placeholders::_1);void_...
为什么cppreference上说std::printf是表达式?可以把函数名称理解为一种常量，其中记录着函数的地址。普通的...
Names(lookup) Types(fundamental types) Themainfunction Modules(C++20) Contracts(C++26) Expressions Value categories Evaluation order Operators(precedence) Conversions−Literals Constant expressions Statements if−switch for−range-for(C++11) while−do-while ...
a cast expression to rvalue reference to function type, such as static_cast<void (&&)(int)>(x). (C++ 11 右值强转函数类型) Properties: Same as glvalue (below). Address of an lvalue may be taken: &++i[1] and &std::endl are valid expressions. ...
(\"" << str << "\", " << x << ")\n"; } int main() { std::function<void(const char*, int)> f1{foo}; std::function<void(const char*, int)> f2{bar}; f1("f1", 1); f2("f2", 2); std::cout << "std::swap(f1, f2);\n"; std::swap(f1, f2); f1("f1", ...
#include <functional> #include <iostream> int f(int, int) { return 1; } int g(int, int) { return 2; } void test(std::function<int(int, int)> const& arg) { std::cout << "test function: "; if (arg.target<std::plus<int>>()) std::cout << "it is plus\n"; if (arg...
template< class T > struct is_function; (since C++11) std::is_function is a UnaryTypeTrait. Checks whether T is a function type. Types like std::function, lambdas, classes with overloaded operator() and pointers to functions don't count as function types. Provides the member constant ...