dispatch: add dispatch_source, dispatch_queue

Signed-off-by: Simon Rozman <simon@rozman.si>

include/MacStd/dispatch.hpp

@@ -0,0 +1,42 @@
+/*
+	SPDX-License-Identifier: MIT
+	Copyright © 2025 Amebis
+*/
+
+#pragma once
+
+#include "common.hpp"
+#include <dispatch/dispatch.h>
+
+namespace macstd {
+	///
+	/// Dispatch object traits
+	///
+	struct dispatch_traits
+	{
+		static inline constexpr dispatch_source_t invalid = static_cast<dispatch_source_t>(NULL);
+
+		///
+		/// Decrements the reference count (the retain count) of a dispatch object
+		///
+		/// \sa [dispatch_release function](https://developer.apple.com/documentation/dispatch/1496328-dispatch_release)
+		///
+		static void free(dispatch_source_t h) noexcept
+		{
+			dispatch_release(h);
+		}
+
+	private:
+		static dispatch_source_t duplicate(dispatch_source_t h);
+	};
+
+	///
+	/// Dispatch event source
+	///
+	using dispatch_source = handle<dispatch_source_t, dispatch_traits>;
+
+	///
+	/// Dispatch event source
+	///
+	using dispatch_queue = handle<dispatch_queue_t, dispatch_traits>;
+}