c_cpp 使用一堆C ++ 11/14特性和“老派”C ++开发人员的单一函数甚至不再像C ++那样阅读.Specificall

Posted 2021-05-14

#include <iostream>
#include <future>

using namespace std;

template <typename Fn, typename... Args>
auto do_async_with_log(ostream& os, Fn&& fn, Args&&... args) ->
	future<decltype(fn(args...))>
{
	os << "[TID=" << this_thread::get_id()
	   << "] Starting to invoke function..." << endl;
	auto bound = bind(fn, forward<Args&&...>(args...));
	return async([b=move(bound),&os]() mutable {
		auto result = b();
		os << "[TID=" << this_thread::get_id()
		   << "] ...invocation done, returning " << result << endl;
		return result;
	});
}