A function objectgof unspecified typeT, for whichstd::is_bind_expression<T>::valueistrue. It has the following members: std::bindreturn type Member objects The return type ofstd::bindholds a member object of typ
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
std::function<int(Foo const&)> f_num = &Foo::num_; std::cout << "num_: " << f_num(foo) << '\n'; // store a call to a member function and object using std::placeholders::_1; std::function<void(int)> f_add_display2 = std::bind(&Foo::print_add, foo, _1); f_...
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), ...
The arguments to std::bind_front or std::bind_back are copied or moved, and are never passed by reference unless wrapped in std::ref or std::cref. Typically, binding arguments to a function or a member function using (1) std::bind_front and (3) std::bind_back requires storing a...
1) 绑定f 的第一实参到 x。相当于调用 std::binder1st<F>(f, typename F::first_argument_type(x))。2) 绑定f 的第二实参到 x。相当于调用 std::binder2nd<F>(f, typename F::second_argument_type(x))。参数f - 指向要绑定实参到的函数的指针 x - 要绑定到 f 的实参 ...
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...
(function) atomic_signal_fence (C++11) fence between a thread and a signal handler executed in the same thread (function) Defined in header<stdatomic.h> C compatibility macros(since C++23) _Atomic (C++23) compatibility macro such that_Atomic(T)is identical tostd::atomic<T> ...
constexpr bool is_bind_expression_v = is_bind_expression<T>::value; (since C++17) Inherited from std::integral_constant Member constants value [static] true if T is a function object generated by std::bind, false otherwise (public static member constant) Member functions operator bool ...