:function<int()>rnd=std::bind(d, e);// e 的一个副本存储于 rndfor(intn=0;n<10;++n)std::cout<<rnd()<<' ';std::cout<<'\n';std::cout<<"5) 绑定成员函数指针:";Foo foo;autof3=std::bind(&Foo::print_sum,&foo,95, _1);f3(5);std::cout<<"6) 绑定成员函数指针 mem_fn...
member function and object ptrstd::function<void(int)>f_add_display3=std::bind(&Foo::print_add,&foo, _1);f_add_display3(3);// store a call to a function objectstd::function<void(int)>f_display_obj=PrintNum();f_display_obj(18);autofactorial=[](intn){// store a lambda ...
不同于 std::bind,它们不支持任意实参重排,而且不特别处理嵌套的绑定表达式或 std::reference_wrapper。另一方面,它们注重调用包装器对象的值类别,并传播底层调用运算符的异常说明。 如std::invoke 中所述,调用指向非静态成员函数的指针或指向非静态数据成员的指针时,首个实参必须是指向要访问其成员的对象的引用或...
is_bind_expression std::is_bind_expression From cppreference.com <cpp |utility |functional Function objects Defined in header<functional> template<classT> structis_bind_expression; (since C++11) IfTis a type produced by a call tostd::bind(but notstd::bind_frontorstd::bind_back), ...
可调用(Callable)类型是可应用INVOKE和INVOKE<R>操作(例如用于std::function、std::bind和std::thread::thread)的类型。 库函数std::invoke可以显式执行INVOKE操作。 (C++17 起) 库函数std::invoke_r可以显式执行INVOKE<R>操作。 (C++23 起) 要求
copyable_function<> (C++26 起) copysign() (C++11 起) copysignf() (C++11 起) copysignl() (C++11 起) coroutine_handle<> (C++20 起) coroutine_traits<> (C++20 起) cos() cos<>() (std::complex) cos<>() (std::valarray) cosf() (C++11 起) cosh() cosh<>() (std::complex) co...
std::bindusesstd::is_placeholderto detect placeholders for unbound arguments. Helper variable template template<classT> constexprintis_placeholder_v=is_placeholder<T>::value; (since C++17) Inherited fromstd::integral_constant Member constants
std::identityis the identity function object: it returns its argument unchanged. identity (C++20) function object that returns its argument unchanged (class) Partial function application std::bind_frontandstd::bindprovide support forpartial function application, i.e. binding arguments to functions to...
成员函数指针可用作回调或函数对象,通常在应用 std::mem_fn 或std::bind 之后: 运行此代码 #include <algorithm> #include <cstddef> #include <functional> #include <iostream> #include <string> int main() { std::vector<std::string> v = {"a", "ab", "abc"}; std::vector<std::size_t> ...
(conststd::string&)>;Object instance;std::stringstr("World");ExampleFunction f=std::bind(&Object::hello,&instance, _1);f(str);// equivalent to instance.hello(str)f=std::bind(&goodbye, std::placeholders::_1);f(str);// equivalent to goodbye(str)autolambda=[](std::stringpre,charo...