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+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <time.h>
+#include <iostream>
+#include <string>
+
+#include "base/time.hh"
+
+using namespace std;
+
+struct _timeval
+{
+ timeval tv;
+};
+
+double
+convert(const timeval &tv)
+{
+ return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
+}
+
+Time::Time(bool set_now)
+{
+ time = new _timeval;
+ if (set_now)
+ set();
+}
+
+Time::Time(const timeval &val)
+{
+ time = new _timeval;
+ set(val);
+}
+
+Time::Time(const Time &val)
+{
+ time = new _timeval;
+ set(val.get());
+}
+
+Time::~Time()
+{
+ delete time;
+}
+
+const timeval &
+Time::get() const
+{
+ return time->tv;
+}
+
+void
+Time::set()
+{
+ ::gettimeofday(&time->tv, NULL);
+}
+
+void
+Time::set(const timeval &tv)
+{
+ memcpy(&time->tv, &tv, sizeof(timeval));
+}
+
+double
+Time::operator()() const
+{
+ return convert(get());
+}
+
+string
+Time::date(string format) const
+{
+ const timeval &tv = get();
+ time_t sec = tv.tv_sec;
+ char buf[256];
+
+ if (format.empty()) {
+ ctime_r(&sec, buf);
+ buf[24] = '\0';
+ return buf;
+ }
+
+ struct tm *tm = localtime(&sec);
+ strftime(buf, sizeof(buf), format.c_str(), tm);
+ return buf;
+}
+
+ostream &
+operator<<(ostream &out, const Time &start)
+{
+ out << start.date();
+ return out;
+}
+
+Time
+operator-(const Time &l, const Time &r)
+{
+ timeval tv;
+ timersub(&l.get(), &r.get(), &tv);
+ return tv;
+}
+
+const Time Time::start(true);