ChronoIO.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#pragma once
 
#include <chrono>
#include <iostream>
 
#if __cplusplus <= 201703L
 
namespace std {
  namespace chrono {
 
    namespace io {
      template <typename T>
      inline std::string duration_unit( T ) {
        return "";
      }
 
      // template specializations for units of time
      template <>
      inline std::string duration_unit( std::chrono::nanoseconds ) {
        return "ns";
      }
 
      template <>
      inline std::string duration_unit( std::chrono::microseconds ) {
        return "us";
      }
 
      template <>
      inline std::string duration_unit( std::chrono::milliseconds ) {
        return "ms";
      }
 
      template <>
      inline std::string duration_unit( std::chrono::seconds ) {
        return "s";
      }
 
      template <>
      inline std::string duration_unit( std::chrono::minutes ) {
        return "m";
      }
 
      template <>
      inline std::string duration_unit( std::chrono::hours ) {
        return "h";
      }
    } // namespace io
 
    template <class Rep, class Period>
    std::ostream& operator<<( std::ostream& os, const duration<Rep, Period>& d ) {
      os << d.count() << io::duration_unit( d );
      return os;
    }
  } // namespace chrono
} // namespace std
 
#endif // C++17