1.16.1 initial CVS checkin

[SVN r7620]

timer.cpp

@@ -0,0 +1,53 @@
+//  timer class implementation  ----------------------------------------------//
+
+//  (C) Copyright Beman Dawes 1994-98. Permission to copy, use, modify, sell and
+//  distribute this software is granted provided this copyright notice appears
+//  in all copies. This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+
+///  Portability warning: this implementation depends on std::clock() returning
+///  elapsed time, and CLOCKS_PER_SEC being reasonably large. Those
+///  requirements are not met by all operating systems. 
+
+//  Revision History
+//  25 Sep 99  elapsed_max() and elapsed_min() added (John_Maddock)
+//  16 Jul 99  Second beta
+//   6 Jul 99  Initial boost version
+
+#include <boost/timer.hpp>
+#include <ctime>
+#include <limits>
+
+namespace std {}      /// cope with implementations which do not yet
+using namespace std;  /// place the <ctime> functions in namespace std
+                      /// Yes, this is ugly, but it is also the real world
+
+namespace boost {
+
+class timer::_timer { public: clock_t start_time; };
+
+timer::timer() : _imp( new _timer ) { _imp->start_time = clock(); }
+
+timer::timer( const timer& src ) : _imp( new _timer )
+                                    { _imp->start_time = src._imp->start_time; }
+timer::~timer(){}
+ 
+void timer::restart()               { _imp->start_time = clock(); }
+
+timer& timer::operator=( const timer& src )
+  { _imp->start_time = src._imp->start_time; return * this; }
+    
+double timer::elapsed() const 
+  { return  double(clock() - _imp->start_time) / CLOCKS_PER_SEC; }
+
+double timer::elapsed_max() const {
+    return (double(numeric_limits<clock_t>::max())
+       - double(_imp->start_time)) / double(CLOCKS_PER_SEC); 
+}
+
+double timer::elapsed_min() const   { return double(1)/double(CLOCKS_PER_SEC); }
+
+
+              
+} // namespace boost
+