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named_thread: rewrite result_storage

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Use SFINAE as permitted by std::invoke_result_t<>
This commit is contained in:
Nekotekina 2021-02-24 13:45:10 +03:00
parent 7cb32a3680
commit 29e7eda887
1 changed files with 14 additions and 15 deletions
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29
Utilities/Thread.h
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@ -42,10 +42,20 @@ class need_wakeup {};
template <class Context>
class named_thread;
template <typename T>
template <typename Ctx, typename X = void, typename... Args>
struct result_storage
{
static_assert(std::is_default_constructible_v<T> && noexcept(T()));
static constexpr bool empty = true;
using type = void;
};
template <typename Ctx, typename... Args>
struct result_storage<Ctx, std::enable_if_t<!std::is_void_v<std::invoke_result_t<Ctx, Args&&...>>>, Args...>
{
using T = std::invoke_result_t<Ctx, Args&&...>;
static_assert(std::is_default_constructible_v<T>);
alignas(T) std::byte data[sizeof(T)];
@ -69,17 +79,6 @@ struct result_storage
}
};
template <>
struct result_storage<void>
{
static constexpr bool empty = true;
using type = void;
};
template <class Context, typename... Args>
using result_storage_t = result_storage<std::invoke_result_t<Context, Args...>>;
template <typename T, typename = void>
struct thread_thread_name : std::bool_constant<false> {};
@ -306,9 +305,9 @@ private:
// Derived from the callable object Context, possibly a lambda
template <class Context>
class named_thread final : public Context, result_storage_t<Context>, thread_base
class named_thread final : public Context, result_storage<Context>, thread_base
{
using result = result_storage_t<Context>;
using result = result_storage<Context>;
using thread = thread_base;
static u64 entry_point(thread_base* _base)