std::mem_fn std::bind std::function std::bad_function_call std::is_bind_expression std::is_placeholder std::placeholders::_1, std::placeholders::_2, ..., std::placeholders::_N std::invoke std::not_fn std::bind_
std::indirectly_readable<I> && std::copy_constructible<F> && std::invocable<F&, iter_value_t<I>&> && std::invocable<F&, iter_reference_t<I>> && std::invocable<F&, iter_common_reference_t<I>> && std::common_reference_with< std::invoke_result_t<F&, std::iter_value_t<I>&>...
template<typenameT>boolIsTrue(T&& value){ifconstexpr(std::is_invocable_v<T>){// 如果是可调用对象,调用它并返回结果returnstd::forward<T>(value)(); }else{// 否则,将其转换为boolreturnstatic_cast<bool>(std::forward<T>(value)); } } 基于以上模板改写 IsAllTure 模板函数 : template<typenam...
static_assert( __is_invocable<typename decay<_Callable>::type, typename decay<_Args>::type...>::value, "std::thread arguments must be invocable after conversion to rvalues" ); 先抛开这些恐怖的模板修饰,它主要需要2个参数,一个是线程所运行的函数体__f,一个是传递给函数体的参数__args ,其他...
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::...
template requires view<V> && is_object_v<F> && regular_invocable<F&, range_reference_t<V>> && can-reference<invoke_result_t<F&, range_reference_t<V>>> class transform_view : public view_interface<transform_view<V, F>>; Параметрышаблона FТипобъекта...
P0595R2 std::is_constant_evaluated() VS 2019 16.5 20 P0602R4 Propagating Copy/Move Triviality In variant/optional VS 2017 15.317 P0604R0 Changing is_callable/result_of To invoke_result, is_invocable, is_nothrow_invocable VS 2017 15.3 17 P0607R0 Inline Variables for the Stand...
37 37 static_assert(std::is_invocable_r<void, D>::value, 38 38 "on_drop should be callable with the following signature: void on_drop()"); 39 39 ::z_owned_closure_hello_t c_closure; 40 - using ClosureType = typename detail::closures::Closure<C, D, void, const Hello&>; ...
int main() { float x; float& r = x; auto p = [=] {}; std::cout << sizeof p << '\n'; } 请问打印多少? 答案:1 解释: 如果捕获符列表具有默认捕获符,且未显式(以 this 或 this)捕获它的外围对象,或任何在 lambda 体内可ODR 使用的自动变量,或对应变量拥有自动存储期的结构化绑定 (...
using IValueWithStorages = std::tuple<IValue, std::vector<WeakStorage>>; #if __cpp_lib_is_invocable >= 201703 static_assert( guts::disjunction< std::disjunction< std::is_invocable_r<IValue, T, Future&>, std::is_invocable_r<IValueWithStorages, T, Future&>>::value, "The callback ...