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extern/STLport/5.2.1/test/unit/cppunit/cppunit_timer.h

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+/*
+ * Copyright (c) 2006
+ * Francois Dumont
+ *
+ * This material is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * Permission to use or copy this software for any purpose is hereby granted
+ * without fee, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+
+#ifndef CPPUNIT_TIMER_H
+#define CPPUNIT_TIMER_H
+
+#if defined (_WIN32)
+#  define CPPUNIT_WIN32_TIMER
+#  include <windows.h>
+#endif
+
+class Timer {
+public:
+  Timer() {
+#if defined (CPPUNIT_WIN32_TIMER)
+    m_start.LowPart = m_restart.LowPart = m_stop.LowPart = 0;
+    m_start.HighPart = m_restart.HighPart = m_stop.HighPart = 0;
+    QueryPerformanceFrequency(&m_frequency);
+#endif
+  }
+
+  void start() {
+#if defined (CPPUNIT_WIN32_TIMER)
+    QueryPerformanceCounter(&m_start);
+#endif
+  }
+
+  void restart() {
+#if defined (CPPUNIT_WIN32_TIMER)
+    QueryPerformanceCounter(&m_restart);
+    if (m_start.HighPart == 0 && m_start.LowPart == 0) {
+      m_start = m_restart;
+    }
+#endif
+  }
+
+  void stop() {
+#if defined (CPPUNIT_WIN32_TIMER)
+    LARGE_INTEGER stop;
+    QueryPerformanceCounter(&stop);
+    if ((m_stop.HighPart != 0 || m_stop.LowPart != 0) &&
+        m_restart.HighPart != 0 && m_restart.LowPart != 0) {
+      m_stop.HighPart += (stop.HighPart - m_restart.HighPart);
+      if (stop.LowPart < m_restart.LowPart) {
+        if (m_restart.LowPart - stop.LowPart > m_stop.LowPart) {
+          m_stop.HighPart -= 1;
+        }
+        m_stop.LowPart -= m_restart.LowPart - stop.LowPart;
+      }
+      else {
+        if (stop.LowPart - m_restart.LowPart > 0xFFFFFFFF - m_stop.LowPart) {
+          m_stop.HighPart += 1;
+        }
+        m_stop.LowPart += stop.LowPart - m_restart.LowPart;
+      }
+    }
+    else {
+      m_stop = stop;
+    }
+#endif
+  }
+
+  double elapsedMilliseconds() const {
+#if defined (CPPUNIT_WIN32_TIMER)
+    LARGE_INTEGER elapsed;
+    elapsed.HighPart = m_stop.HighPart - m_start.HighPart;
+    elapsed.LowPart = m_stop.LowPart - m_start.LowPart;
+    return (double)elapsed.QuadPart / (double)m_frequency.QuadPart * 1000;
+#else
+    return 0;
+#endif
+  }
+
+  static bool supported() {
+#if defined (CPPUNIT_WIN32_TIMER)
+    return true;
+#else
+    return false;
+#endif
+  }
+
+private:
+#if defined (CPPUNIT_WIN32_TIMER)
+  LARGE_INTEGER m_frequency;
+  LARGE_INTEGER m_start, m_stop, m_restart;
+#endif
+};
+
+#endif