ceph/src/boost/libs/chrono/example/clock_name.hpp

   1 //  stopclock_perf.cpp  ---------------------------------------------------//
   2
   3 //  Copyright 2009 Vicente J. Botet Escriba
   4 //  Copyright 2009 Howard Hinnant
   5
   6 //  Distributed under the Boost Software License, Version 1.0.
   7 //  See http://www.boost.org/LICENSE_1_0.txt
   8
   9 //  See http://www.boost.org/libs/chrono for documentation.
  10
  11 #ifndef BOOST_CHRONO_CLOCK_NAME_HPP
  12 #define BOOST_CHRONO_CLOCK_NAME_HPP
  13
  14 #include <boost/chrono/chrono.hpp>
  15 #include <boost/type_traits/is_same.hpp>
  16
  17 template <typename Clock,
  18           bool = boost::is_same<Clock, boost::chrono::system_clock>::value,
  19 #ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
  20     bool = boost::is_same<Clock, boost::chrono::steady_clock>::value,
  21 #else
  22     bool = false,
  23 #endif
  24           bool = boost::is_same<Clock, boost::chrono::high_resolution_clock>::value
  25          >
  26 struct name;
  27
  28 template <typename Clock>
  29 struct name<Clock, false, false, false>  {
  30     static const char* apply() { return "unknown clock";}
  31 };
  32
  33 template <typename Clock>
  34 struct name<Clock, true, false, false>  {
  35     static const char* apply() { return "system_clock";}
  36 };
  37
  38 template <typename Clock>
  39 struct name<Clock, false, true, false>  {
  40     static const char* apply() { return "steady_clock";}
  41 };
  42
  43 template <typename Clock>
  44 struct name<Clock, false, false, true>  {
  45     static const char* apply() { return "high_resolution_clock";}
  46 };
  47
  48 template <typename Clock>
  49 struct name<Clock, false, true, true>  {
  50     static const char* apply() { return "steady_clock and high_resolution_clock";}
  51 };
  52
  53 template <typename Clock>
  54 struct name<Clock, true, false, true>  {
  55     static const char* apply() { return "system_clock and high_resolution_clock";}
  56 };
  57
  58 template <typename Clock>
  59 struct name<Clock, true, true, false>  {
  60     static const char* apply() { return "system_clock and steady_clock";}
  61 };
  62
  63 template <typename Clock>
  64 struct name<Clock, true, true, true>  {
  65     static const char* apply() { return "system_clock, steady_clock and high_resolution_clock";}
  66 };
  67
  68 #endif