对于类成员函数、lambda表达式或其他可调用对象就无能为力了，因此，C++11推出了std::function与std::b...
std::cout << "1) bind to a pointer to member function: "; Foo foo; // 这里的&foo就是为了补齐成员变量里面的默认参数this auto f3 = std::bind(&Foo::print_sum, &foo, 95, _1); f3(5); std::cout << "2) bind to a mem_fn that is a pointer to member function: "; } 执行...
function<int(int, int)> f = g_Minus; cout << f(1, 2) << endl; // -1 return 1; } 赋值给函数对象 std::function<bool()> fIsItemValid = [this](){inttimeOutCount =VALUE_0;do{if(m_parent && m_xAxis &&m_yAxis){returntrue; }else{++timeOutCount; QThread::msleep(TIME_OUT_...
它可以看做是C++98标准库中函数对象mem_fun_t, pointer_to_unary_function等的替代品。同样的,bind()也可以被看做是bind1st()和bind2nd()的替代品,当然比他们更强大更灵活。 参考: Standard:20.7.12Function template bind,20.7.16.2Class template function Herb Sutter:Generalized Function Pointers . August200...
C++之std::function与std::bind 一、std::function 1、概念 std::function是一个函数包装器模板,最早来自boost库,对应其boost::function函数包装器。在c++0x11中,将boost::function纳入标准库中。该函数包装器模板能包装任何类型的可调用元素(callable element),例如普通函数和函数对象。包装器对象可以进行拷贝,并且...
An object of a function class instantiation can wrap any of the following kinds of callable objects: a function, a function pointer, a pointer to member, or any kind of function object (i.e., an object whose class defines operator(), including closures). ...
std::bind常用来实现闭包,它用于包装和调用特征相同的函数指针、函数对象或lambda表达式。 std::bind可以充当函数适配器,即它接受一个原函数作为输入并返回一个新的函数对象作为输出,返回的函数对象包含一个或多个与原函数绑定的参数。std::bind可以预先指定函数的所有参数,也可以将函数的部分参数预先指定好,剩下的...
; static_assert(std::is_function_pointer_v<&X::S_foo>); std::cout <<std::bind(&X...
std::function<std::vector<uint8_t>(Nor::Range)> f = std::bind(&Car::drive, this); 并出现以下错误: /usr/include/c++/9/functional:775:7: error: static assertion failed: Wrong number of arguments for pointer-to-member 774 | static_assert(_Varargs::value ...
f-Callable object (function object, pointer to function, reference to function, pointer to member function, or pointer to data member) that will be bound to some arguments args-list of arguments to bind, with the unbound arguments replaced by the placeholders _1, _2, _3... of namespace ...