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tjp/core/timer/Timer.hpp

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+// License: Modified MIT (NON-AI)
+// See the LICENSE file in the root directory for license information.
+// Copyright 2025 Timothy Prepscius
+
+#pragma once
+
+#include "Timer.h"
+#include <chrono>
+#include <thread>
+
+#include "../containers/Optional.hpp"
+#include "../assert/debug_assert.h"
+
+namespace tjp::core {
+
+class Timer
+{
+  public:
+	typedef double Time;
+	typedef double Duration;
+	
+	Duration accumulator = 0;
+	Optional<std::chrono::time_point<std::chrono::high_resolution_clock>> then;
+
+	Timer()
+	{
+		start();
+	}
+
+	Timer(bool start_)
+	{
+		if (start_)
+			start();
+	}
+
+	auto now() const
+	{
+		return std::chrono::high_resolution_clock::now();
+	}
+
+	void start()
+	{
+		debug_assert(!then);
+		
+		accumulator = 0;
+		then = now();
+	}
+	
+	void restart()
+	{
+		then.reset();
+		start();
+	}
+
+	bool running ()
+	{
+		return then.has_value();
+	}
+
+	Duration elapsed() const
+	{
+		if (!then)
+			return accumulator;
+			
+		auto now_ = now();
+		auto duration = std::chrono::duration<double>(now_ - *then).count();
+
+		return duration + accumulator;
+	}
+	
+	void pause()
+	{
+		if (!then)
+			return ;
+			
+		auto now_ = now();
+		auto partial = std::chrono::duration<double>(now_ - *then).count();
+		then.reset();
+		accumulator += partial;
+	}
+	
+	Duration stop()
+	{
+		pause();
+		return accumulator;
+	}
+
+	void resume()
+	{
+		debug_assert(!then);
+		
+		then = now();
+	}
+};
+
+} // namespace