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fix(exercise): replace std::result_of with std::invoke_result since the old one is deprecated in C++20; #273

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fix(exercise): replace std::result_of with std::invoke_result since the old one is deprecated in C++20; #273

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3 changes: 2 additions & 1 deletion exercises/7/7.1/thread_pool.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
#ifndef THREAD_POOL_H
#define THREAD_POOL_H

#include <type_traits>
#include <vector> // std::vector
#include <queue> // std::queue
#include <memory> // std::make_shared
Expand Down Expand Up @@ -96,7 +97,7 @@ inline ThreadPool::ThreadPool(size_t threads): stop(false) {
template<class F, class... Args>
decltype(auto) ThreadPool::enqueue(F&& f, Args&&... args) {
// deduce return type
using return_type = typename std::result_of<F(Args...)>::type;
using return_type = typename std::invoke_result<F,Args...>::type;
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Suggested change
using return_type = typename std::invoke_result<F,Args...>::type;
using return_type = std::invoke_result_t<F,Args...>;


// fetch task
auto task = std::make_shared<std::packaged_task<return_type()>>(
Expand Down