scintilla/src/ElapsedPeriod.h

   1 // Scintilla source code edit control
   2 /** @file ElapsedPeriod.h
   3  ** Encapsulate C++ <chrono> to simplify use.
   4  **/
   5 // Copyright 2018 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #ifndef ELAPSEDPERIOD_H
   9 #define ELAPSEDPERIOD_H
  10
  11 namespace Scintilla::Internal {
  12
  13 // Simplified access to high precision timing.
  14 class ElapsedPeriod {
  15         using ElapsedClock = std::chrono::steady_clock;
  16         ElapsedClock::time_point tp;
  17 public:
  18         /// Capture the moment
  19         ElapsedPeriod() noexcept : tp(ElapsedClock::now()) {
  20         }
  21         /// Return duration as floating point seconds
  22         double Duration(bool reset=false) noexcept {
  23                 const ElapsedClock::time_point tpNow = ElapsedClock::now();
  24                 const std::chrono::duration<double> duration =
  25                         std::chrono::duration_cast<std::chrono::duration<double>>(tpNow - tp);
  26                 if (reset) {
  27                         tp = tpNow;
  28                 }
  29                 return duration.count();
  30         }
  31 };
  32
  33 }
  34
  35 #endif