ircd::util: Add std::chrono timer for benching.

include/ircd/stdinc.h

@@ -81,6 +81,7 @@ namespace ircd
 }
 
 #include "util.h"
+#include "util_timer.h"
 #include "defaults.h"
 #include "exception.h"
 #include "numeric.h"

include/ircd/util_timer.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2016 Charybdis Development Team
+ * Copyright (C) 2016 Jason Volk <jason@zemos.net>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ */
+
+#pragma once
+#define HAVE_IRCD_UTIL_TIMER_H
+
+#ifdef __cplusplus
+
+namespace ircd {
+inline namespace util {
+
+struct timer
+{
+	using clock = std::chrono::steady_clock;
+
+	clock::time_point start;
+	clock::time_point stop;
+
+	template<class duration = std::chrono::seconds> duration get() const;
+	template<class duration = std::chrono::seconds> duration mark();
+
+	timer(const std::function<void ()> &);
+	timer();
+};
+
+inline
+timer::timer()
+:start{clock::now()}
+,stop{clock::time_point::min()}
+{
+}
+
+inline
+timer::timer(const std::function<void ()> &func)
+:timer{}
+{
+	func();
+	mark();
+}
+
+template<class duration>
+duration
+timer::mark()
+{
+	stop = clock::now();
+	return std::chrono::duration_cast<duration>(stop - start);
+}
+
+template<class duration>
+duration
+timer::get()
+const
+{
+	static const auto min(clock::time_point::min());
+	const clock::time_point stop(this->stop != min? this->stop : clock::now());
+	return std::chrono::duration_cast<duration>(stop - start);
+}
+
+}        // namespace util
+}        // namespace ircd
+#endif   // __cplusplus