GSL/include/gsl/gsl_thread

///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2017 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////

#pragma once

#ifndef GSL_THREAD_H
#define GSL_THREAD_H

#include <thread>

#ifdef _MSC_VER
 #pragma warning(push)

 // turn off some warnings that are noisy about our Expects statements
 #pragma warning(disable : 4127) // conditional expression is constant

 // blanket turn off warnings from CppCoreCheck for now
 // so people aren't annoyed by them when running the tool.
 // more targeted suppressions will be added in a future update to the GSL
 #pragma warning(disable : 26481 26482 26483 26485 26490 26491 26492 26493 26495)
#endif // _MSC_VER

namespace gsl
{

class detached_thread
{
	friend void swap(detached_thread& t1, detached_thread& t2) noexcept;

public:
	detached_thread() noexcept = default;

	detached_thread(detached_thread const&) = delete;
	detached_thread(detached_thread&& other): t(std::move(other.t)) {}

	detached_thread(std::thread const&) = delete;
	detached_thread(std::thread&& other) noexcept: t(std::move(other)) { t.detach(); }

	detached_thread& operator=(detached_thread const&) = delete;
	detached_thread& operator=(detached_thread&& other) noexcept { t = std::move(other.t); return *this; }

	detached_thread& operator=(std::thread const&) = delete;
	detached_thread& operator=(std::thread&& other) noexcept { t = std::move(other); t.detach(); return *this; }

	template<typename Callable, typename... Args>
	explicit detached_thread(Callable&& f, Args&&... args)
	: t(std::forward<Callable>(f), std::forward<Args>(args)...) { t.detach(); }

	bool joinable() const { return t.joinable(); }

	std::thread::id get_id() const noexcept { return t.get_id(); }

	std::thread::native_handle_type native_handle() { return t.native_handle(); }

	void join() { t.join(); }

	void swap(detached_thread& other) noexcept { using std::swap; swap(t, other.t); }

private:
	std::thread t;
};

void swap(detached_thread& t1, detached_thread& t2) noexcept
{
	using std::swap;
	swap(t1.t, t2.t);
}

class raii_thread
{
	friend void swap(raii_thread& t1, raii_thread& t2) noexcept;
	
public:
	raii_thread() noexcept = default;
	
	raii_thread(raii_thread const&) = delete;
	raii_thread(raii_thread&& other): t(std::move(other.t)) {}

	raii_thread(std::thread const&) = delete;
	raii_thread(std::thread&& other) noexcept: t(std::move(other)) {}

	raii_thread& operator=(raii_thread const&) = delete;
	raii_thread& operator=(raii_thread&& other) noexcept { t = std::move(other.t); return *this; }
	
	raii_thread& operator=(std::thread const&) = delete;
	raii_thread& operator=(std::thread&& other) noexcept { t = std::move(other); return *this; }

	template<typename Callable, typename... Args>
	explicit raii_thread(Callable&& f, Args&&... args)
	: t(std::forward<Callable>(f), std::forward<Args>(args)...) {}

	~raii_thread() { if(t.joinable()) t.join(); }
	
	bool joinable() const { return t.joinable(); }
	
	std::thread::id get_id() const noexcept { return t.get_id(); }
	
	std::thread::native_handle_type native_handle() { return t.native_handle(); }
	
	void join() { t.join(); }
	
	void swap(raii_thread& other) noexcept { using std::swap; swap(t, other.t); }

private:
	std::thread t;
};

void swap(raii_thread& t1, raii_thread& t2) noexcept
{
	using std::swap;
	swap(t1.t, t2.t);
}

} // namespace gsl

#ifdef _MSC_VER
 #pragma warning(pop)
#endif // _MSC_VER

#endif // GSL_THREAD_H