How to get duration as int milli s and float seconds from chrono

Question

I m trying to use chrono library for timers and durations   I want to be able to have a Duration frameStart    from app start   and a Duration frameDelta    time between frames    I need to be able to get the frameDelta duration as milliseconds and float seconds   How do you do this with the new c  11  lt chrono gt  libraries   I ve been working on it and googling   information is sparse    The code is heavily templated and requires special casts and things  I can t figure out how to use this library correctly

User · Accepted Answer

Is this what you re looking for    include  lt chrono gt   include  lt iostream gt   int main         typedef std  chrono  high resolution clock Time      typedef std  chrono  milliseconds ms      typedef std  chrono  duration lt float gt  fsec      auto t0   Time  now        auto t1   Time  now        fsec fs   t1 - t0      ms d   std  chrono  duration cast lt ms gt  fs       std  cout  lt  lt  fs count    lt  lt   s n       std  cout  lt  lt  d count    lt  lt   ms n       which for me prints out   6 5e-08s 0ms

User · Answer

In AAA style using the explicitly typed initializer idiom    include  lt chrono gt   include  lt iostream gt   int main      auto start   std  chrono  high resolution clock  now         Code to time here      auto end   std  chrono  high resolution clock  now       auto dur   end - start    auto i millis   std  chrono  duration cast lt std  chrono  milliseconds gt  dur     auto f secs   std  chrono  duration cast lt std  chrono  duration lt float gt  gt  dur     std  cout  lt  lt  i millis count    lt  lt    n     std  cout  lt  lt  f secs count    lt  lt    n

User · Answer

I don t know what  milliseconds and float seconds  means  but this should give you an idea    include  lt chrono gt   include  lt thread gt   include  lt iostream gt   int main       auto then   std  chrono  system clock  now      std  this thread  sleep for std  chrono  seconds 1      auto now   std  chrono  system clock  now      auto dur   now - then    typedef std  chrono  duration lt float gt  float seconds    auto secs   std  chrono  duration cast lt float seconds gt  dur     std  cout  lt  lt  secs count    lt  lt    n

User · Answer

Taking a guess at what it is you re asking for  I m assuming by millisecond frame timer you re looking for something that acts like the following   double mticks         struct timeval tv      gettimeofday  amp tv  0       return  double  tv tv usec   1000   tv tv sec   1000      but uses std  chrono instead   double mticks         typedef std  chrono  high resolution clock clock      typedef std  chrono  duration lt float  std  milli gt  duration       static clock  time point start   clock  now        duration elapsed   clock  now   - start      return elapsed count        Hope this helps

[c++] How to get duration, as int milli's and float seconds from <chrono>?

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