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Unverified Commit 08aeada7 authored by Facundo Galán's avatar Facundo Galán Committed by GitHub
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Replace result_of by invoke_result for C++17 and above (#2021) 


Co-authored-by: default avatarFacundo Galan <fgalan@danaide.com.ar>
parent c8a175f5
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Showing with 18 additions and 5 deletions
dlib/threads/async.h
View file @ 08aeada7
......@@ -40,6 +40,19 @@ namespace dlib
fun();
prom.set_value();
}
template <typename> struct result_of;
#if (__cplusplus >= 201703L || \
(defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)) && \
__cpp_lib_is_invocable >= 201703L
template <typename F, typename... Args>
struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
#else
template <typename F, typename... Args>
struct result_of<F(Args...)>
: std::result_of<F&&(Args&&...)> {};
#endif
}
// ----------------------------------------------------------------------------------------
......@@ -52,21 +65,21 @@ namespace dlib
typename Function,
typename ...Args
>
std::future<typename std::result_of<Function(Args...)>::type> async(
std::future<typename impl::result_of<Function(Args...)>::type> async(
thread_pool& tp,
Function&& f,
Args&&... args
)
{
auto prom = std::make_shared<std::promise<typename std::result_of<Function(Args...)>::type>>();
std::future<typename std::result_of<Function(Args...)>::type> ret = prom->get_future();
auto prom = std::make_shared<std::promise<typename impl::result_of<Function(Args...)>::type>>();
std::future<typename impl::result_of<Function(Args...)>::type> ret = prom->get_future();
using bind_t = decltype(std::bind(std::forward<Function>(f), std::forward<Args>(args)...));
auto fun = std::make_shared<bind_t>(std::bind(std::forward<Function>(f), std::forward<Args>(args)...));
tp.add_task_by_value([fun, prom]()
{
try
{
impl::call_prom_set_value(*prom, *fun, impl::selector<typename std::result_of<Function(Args...)>::type>());
impl::call_prom_set_value(*prom, *fun, impl::selector<typename impl::result_of<Function(Args...)>::type>());
}
catch(...)
{
......@@ -82,7 +95,7 @@ namespace dlib
typename Function,
typename ...Args
>
std::future<typename std::result_of<Function(Args...)>::type> async(
std::future<typename impl::result_of<Function(Args...)>::type> async(
Function&& f,
Args&&... args
)
......
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