Implement synchronous implementation of async::executor

libs/async/include/psemek/async/synchronous_executor.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <psemek/async/executor.hpp>
+
+namespace psemek::async
+{
+
+	struct synchronous_executor
+		: executor
+	{
+		void post(task t) override;
+
+		void post_at(clock::time_point time, task t) override;
+
+		void stop() override;
+
+		void wait() override;
+
+		void wait_for(clock::duration period) override;
+
+		void wait_until(clock::time_point time) override;
+
+		std::size_t task_count() const override;
+	};
+
+}

libs/async/source/synchronous_executor.cpp

@@ -0,0 +1,35 @@
+#include <psemek/async/synchronous_executor.hpp>
+
+#include <stdexcept>
+
+namespace psemek::async
+{
+
+	void synchronous_executor::post(task t)
+	{
+		t();
+	}
+
+	void synchronous_executor::post_at(clock::time_point, task)
+	{
+		throw std::runtime_error("synchronous_executor doesn't support executor::post_at");
+	}
+
+	void synchronous_executor::stop()
+	{}
+
+	void synchronous_executor::wait()
+	{}
+
+	void synchronous_executor::wait_for(clock::duration)
+	{}
+
+	void synchronous_executor::wait_until(clock::time_point)
+	{}
+
+	std::size_t synchronous_executor::task_count() const
+	{
+		return 0;
+	}
+
+}