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std::result_of deprecation #30

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std::result_of deprecation #30

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24 changes: 13 additions & 11 deletions listings/listing_4.14.cpp
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Original file line number Diff line number Diff line change
@@ -1,13 +1,15 @@
#include <future>
template<typename F,typename A>
std::future<std::result_of<F(A&&)>::type>
spawn_task(F&& f,A&& a)
{
typedef std::result_of<F(A&&)>::type result_type;
std::packaged_task<result_type(A&&)>
task(std::move(f));
std::future<result_type> res(task.get_future());
std::thread t(std::move(task),std::move(a));
t.detach();
return res;

template <typename Func, typename ...Args>
std::future<std::invoke_result_t<Func&&, Args&&...>> spawn_task(Func &&f, Args &&...rest) {
typedef std::invoke_result_t<Func&&, Args&&...> result_type;

std::packaged_task<result_type(Args&&...)> task(std::move(f));

std::future<result_type> result(task.get_future());

std::thread worker(std::move(task), std::move(rest)...);
worker.detach();

return result;
}