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common/std/chrono.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/********************************************
+   DISCLAIMER:
+
+   This is a wrapper code to mimic the relevant std:: class
+   Please use it ONLY when porting an existing code e.g. from the original sources
+
+   For all new development please use classes from Common::
+ *********************************************/
+
+#ifndef COMMON_STD_CHRONO_H
+#define COMMON_STD_CHRONO_H
+
+#include "common/system.h"
+
+namespace Std {
+
+namespace chrono {
+
+class duration {
+private:
+	uint32 _value;
+public:
+	duration() : _value(0) {
+	}
+	duration(uint32 value) : _value(value) {
+	}
+
+	size_t count() const {
+		// durations for ScummVM are hardcoded to be in milliseconds
+		return 1000;
+	}
+
+	operator uint32() const {
+		return _value;
+	}
+
+	inline bool operator>=(const duration &rhs) const {
+		return _value >= rhs._value;
+	}
+};
+
+class milliseconds : public duration {
+public:
+	milliseconds() : duration(0) {}
+	milliseconds(uint32 val) : duration(val) {}
+
+	static milliseconds zero() {
+		return milliseconds();
+	}
+};
+
+class microseconds : public duration {
+public:
+	microseconds() : duration(0) {}
+	microseconds(long val) : duration(val / 1000) {}
+};
+
+
+struct system_clock {
+};
+
+
+struct steady_clock { // wraps QueryPerformanceCounter
+	using rep = uint32;
+	using period = milliseconds;
+	using duration = milliseconds;
+	using time_point = uint32;
+	static constexpr bool is_steady = true;
+
+	static time_point now() { // get current time
+		return g_system->getMillis();
+	}
+};
+
+using high_resolution_clock = steady_clock;
+
+template<class T>
+duration duration_cast(T param);
+
+template<class T>
+duration duration_cast(T param) {
+	return duration(param);
+}
+
+} // namespace chrono
+} // namespace Std
+
+#endif