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named_thread: use concepts, improve constructors

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Better default thread name detection.
This commit is contained in:
Nekotekina 2021-04-21 17:19:53 +03:00
parent 67649d7976
commit 61450335a5
1 changed files with 14 additions and 13 deletions
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27
Utilities/Thread.h
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@ -42,7 +42,7 @@ class named_thread;
class thread_base;
template <typename Ctx, typename X = void, typename... Args>
template <typename Ctx, typename... Args>
struct result_storage
{
static constexpr bool empty = true;
@ -50,8 +50,8 @@ struct result_storage
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...>
template <typename Ctx, typename... Args> requires (!std::is_void_v<std::invoke_result_t<Ctx, Args&&...>>)
struct result_storage<Ctx, Args...>
{
using T = std::invoke_result_t<Ctx, Args&&...>;
@ -84,6 +84,12 @@ struct result_storage<Ctx, std::enable_if_t<!std::is_void_v<std::invoke_result_t
}
};
template <typename T>
concept NamedThreadName = requires (T& t)
{
std::string_view(t.thread_name);
};
// Base class for task queue (linked list)
class thread_future
{
@ -110,12 +116,6 @@ public:
}
};
template <typename T, typename = void>
struct thread_thread_name : std::bool_constant<false> {};
template <typename T>
struct thread_thread_name<T, std::void_t<decltype(named_thread<T>::thread_name)>> : std::bool_constant<true> {};
// Thread base class
class thread_base
{
@ -479,16 +479,17 @@ class named_thread final : public Context, result_storage<Context>, thread_base
friend class thread_ctrl;
public:
// Default constructor
named_thread() requires (std::is_default_constructible_v<Context>) && (thread_thread_name<Context>::value)
: Context()
// Forwarding constructor with default name (also potentially the default constructor)
template <typename... Args> requires (std::is_constructible_v<Context, Args&&...>) && (NamedThreadName<Context>)
named_thread(Args&&... args)
: Context(std::forward<Args>(args)...)
, thread(trampoline, Context::thread_name)
{
thread::start();
}
// Normal forwarding constructor
template <typename... Args, typename = std::enable_if_t<std::is_constructible_v<Context, Args&&...>>>
template <typename... Args> requires (std::is_constructible_v<Context, Args&&...>) && (!NamedThreadName<Context>)
named_thread(std::string_view name, Args&&... args)
: Context(std::forward<Args>(args)...)
, thread(trampoline, name)