{

task_group(task_group const&) = delete;

task_group& operator=(task_group const&) = delete;

task_group() noexcept = default;

~task_group() noexcept

{

for (auto&& task : m_tasks)

{

task.wait();

}

}

template <typename T>

void add(T&& callback)

{

#if defined(_DEBUG)

callback();

#else

m_tasks.push_back(std::async(std::forward<T>(callback)));

#endif

}

void get()

{

auto tasks = std::move(m_tasks);

for (auto&& task : tasks)

{

task.wait();

}

for (auto&& task : tasks)

{

task.get();

}

}

private:

std::vector<std::future<void>> m_tasks;