std::ptrdiff_t std::byte std::conjunction std::disjunction std::negation std::is_swappable_with, std::is_swappable, std::is_nothrow_swappable_with, std::is_nothrow_swappable std::is_invocable, std::is_invocable_
LWG 2420C++11当 R 为 void 时,结果必须可隐式转换为 void(这是不可能的)当 R 为 void 时结果可以显式转换后为 void 参阅 is_invocableis_invocable_ris_nothrow_invocableis_nothrow_invocable_r (C++17) 检查类型能否以给定的实参类型调用(如同以std::invoke) (类模板)...
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...
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...
460 464 static_assert(std::is_invocable_r<void, D>::value, 461 465 "on_drop should be callable with the following signature: void on_drop()"); 462 466 ::z_owned_closure_sample_t c_closure; 463 - using ClosureType = typename detail::closures::Closure<C, D, void, const Sample...
is_nothrow_swappable(检查一个类型的对象是否能与同类型或不同类型的对象交换)is_invocable(检查类型...
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 ...
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...
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...