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3rdparty/boost_1_81_0/tools/inspect/time_string.hpp 1.28 KB
73ef4ff3   Hu Chunming   提交三方库
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  // ---- time_string: thin wrapper around std::strftime    -------- //
  //
  //            Copyright Gennaro Prota 2006
  //
  // Distributed under the Boost Software License, Version 1.0.
  //    (See accompanying file LICENSE_1_0.txt or copy at
  //          http://www.boost.org/LICENSE_1_0.txt)
  //
  // ------------------------------------------------------------------
  //
  // $Id$
  
  #ifndef BOOST_TIME_STRING_HPP_GP_20060731
  #define BOOST_TIME_STRING_HPP_GP_20060731
  
  #include <string>
  #include <ctime>
  
  #include <boost/config/warning_disable.hpp>
  
  namespace boost {
  
  // Many of the boost tools just need a quick way to obtain
  // a formatted "run date" string or similar. This is one.
  //
  // In case of failure false is returned and result is
  // unchanged.
  //
  inline
  bool time_string(std::string & result
                 , const std::string & format = "%X UTC, %A %d %B %Y")
  {
      // give up qualifying names and using std::size_t,
      // to avoid including "config.hpp"
      using namespace std;
  
      const int sz = 256;
      char buffer [ sz ] = { 0 };
      const time_t no_cal_time ( -1 );
      time_t tod;
  
      const bool ok =
          time ( &tod ) != no_cal_time
       && strftime( buffer, sz, format.c_str(), gmtime( &tod ) ) != 0
          ;
  
      if (ok)
          result = buffer;
  
      return ok;
  }
  
  }
  
  #endif // include guard