Added boost header

test/external/boost/date_time/microsec_time_clock.hpp

@@ -0,0 +1,127 @@
+#ifndef DATE_TIME_HIGHRES_TIME_CLOCK_HPP___
+#define DATE_TIME_HIGHRES_TIME_CLOCK_HPP___
+
+/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date: 2010-05-10 05:15:48 -0400 (Mon, 10 May 2010) $
+ */
+
+
+/*! @file microsec_time_clock.hpp
+  This file contains a high resolution time clock implementation.
+*/
+
+#include <boost/cstdint.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/date_time/compiler_config.hpp>
+#include <boost/date_time/c_time.hpp>
+#include <boost/date_time/time_clock.hpp>
+#include <boost/date_time/filetime_functions.hpp>
+
+#ifdef BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK
+
+namespace boost {
+namespace date_time {
+
+  //! A clock providing microsecond level resolution
+  /*! A high precision clock that measures the local time
+   *  at a resolution up to microseconds and adjusts to the
+   *  resolution of the time system.  For example, for the
+   *  a library configuration with nano second resolution,
+   *  the last 3 places of the fractional seconds will always
+   *  be 000 since there are 1000 nano-seconds in a micro second.
+   */
+  template<class time_type>
+  class microsec_clock
+  {
+  private:
+    //! Type for the function used to convert time_t to tm
+    typedef std::tm* (*time_converter)(const std::time_t*, std::tm*);
+
+  public:
+    typedef typename time_type::date_type date_type;
+    typedef typename time_type::time_duration_type time_duration_type;
+    typedef typename time_duration_type::rep_type resolution_traits_type;
+
+    //! return a local time object for the given zone, based on computer clock
+    //JKG -- looks like we could rewrite this against universal_time
+    template<class time_zone_type>
+    static time_type local_time(shared_ptr<time_zone_type> tz_ptr)
+    {
+      typedef typename time_type::utc_time_type utc_time_type;
+      typedef second_clock<utc_time_type> second_clock;
+      // we'll need to know the utc_offset this machine has
+      // in order to get a utc_time_type set to utc
+      utc_time_type utc_time = second_clock::universal_time();
+      time_duration_type utc_offset = second_clock::local_time() - utc_time;
+      // use micro clock to get a local time with sub seconds
+      // and adjust it to get a true utc time reading with sub seconds
+      utc_time = microsec_clock<utc_time_type>::local_time() - utc_offset;
+      return time_type(utc_time, tz_ptr);
+    }
+
+    //! Returns the local time based on computer clock settings
+    static time_type local_time()
+    {
+      return create_time(&c_time::localtime);
+    }
+
+    //! Returns the UTC time based on computer settings
+    static time_type universal_time()
+    {
+      return create_time(&c_time::gmtime);
+    }
+
+  private:
+    static time_type create_time(time_converter converter)
+    {
+#ifdef BOOST_HAS_GETTIMEOFDAY
+      timeval tv;
+      gettimeofday(&tv, 0); //gettimeofday does not support TZ adjust on Linux.
+      std::time_t t = tv.tv_sec;
+      boost::uint32_t sub_sec = tv.tv_usec;
+#elif defined(BOOST_HAS_FTIME)
+      winapi::file_time ft;
+      winapi::get_system_time_as_file_time(ft);
+      uint64_t micros = winapi::file_time_to_microseconds(ft); // it will not wrap, since ft is the current time
+                                                               // and cannot be before 1970-Jan-01
+      std::time_t t = static_cast<std::time_t>(micros / 1000000UL); // seconds since epoch
+      // microseconds -- static casts supress warnings
+      boost::uint32_t sub_sec = static_cast<boost::uint32_t>(micros % 1000000UL);
+#else
+#error Internal Boost.DateTime error: BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK is defined, however neither gettimeofday nor FILETIME support is detected.
+#endif
+
+      std::tm curr;
+      std::tm* curr_ptr = converter(&t, &curr);
+      date_type d(static_cast< typename date_type::year_type::value_type >(curr_ptr->tm_year + 1900),
+                  static_cast< typename date_type::month_type::value_type >(curr_ptr->tm_mon + 1),
+                  static_cast< typename date_type::day_type::value_type >(curr_ptr->tm_mday));
+
+      //The following line will adjust the fractional second tick in terms
+      //of the current time system.  For example, if the time system
+      //doesn't support fractional seconds then res_adjust returns 0
+      //and all the fractional seconds return 0.
+      int adjust = static_cast< int >(resolution_traits_type::res_adjust() / 1000000);
+
+      time_duration_type td(static_cast< typename time_duration_type::hour_type >(curr_ptr->tm_hour),
+                            static_cast< typename time_duration_type::min_type >(curr_ptr->tm_min),
+                            static_cast< typename time_duration_type::sec_type >(curr_ptr->tm_sec),
+                            sub_sec * adjust);
+
+      return time_type(d,td);
+    }
+  };
+
+
+} } //namespace date_time
+
+#endif //BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK
+
+
+#endif
+