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kpeter (Peter Kovacs)
Support >= and <= constraints in NetworkSimplex (#219, #234) By default the same inequality constraints are supported as by Circulation (the GEQ form), but the LEQ form can also be selected using the problemType() function. The documentation of the min. cost flow module is reworked and extended with important notes and explanations about the different variants of the problem and about the dual solution and optimality conditions.
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/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library.

 *

 * Copyright (C) 2003-2009

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */



///\file

///\brief Some basic non-inline functions and static global data.



#include<lemon/bits/windows.h>



#ifdef WIN32

#ifndef WIN32_LEAN_AND_MEAN

#define WIN32_LEAN_AND_MEAN

#endif

#ifndef NOMINMAX

#define NOMINMAX

#endif

#ifdef UNICODE

#undef UNICODE

#endif

#include <windows.h>

#ifdef LOCALE_INVARIANT

#define MY_LOCALE LOCALE_INVARIANT

#else

#define MY_LOCALE LOCALE_NEUTRAL

#endif

#else

#include <unistd.h>

#include <ctime>

#include <sys/times.h>

#include <sys/time.h>

#endif



#include <cmath>

#include <sstream>



namespace lemon {

  namespace bits {

    void getWinProcTimes(double &rtime,

                         double &utime, double &stime,

                         double &cutime, double &cstime)

    {

#ifdef WIN32

      static const double ch = 4294967296.0e-7;

      static const double cl = 1.0e-7;



      FILETIME system;

      GetSystemTimeAsFileTime(&system);

      rtime = ch * system.dwHighDateTime + cl * system.dwLowDateTime;



      FILETIME create, exit, kernel, user;

      if (GetProcessTimes(GetCurrentProcess(),&create, &exit, &kernel, &user)) {

        utime = ch * user.dwHighDateTime + cl * user.dwLowDateTime;

        stime = ch * kernel.dwHighDateTime + cl * kernel.dwLowDateTime;

        cutime = 0;

        cstime = 0;

      } else {

        rtime = 0;

        utime = 0;

        stime = 0;

        cutime = 0;

        cstime = 0;

      }

#else

      timeval tv;

      gettimeofday(&tv, 0);

      rtime=tv.tv_sec+double(tv.tv_usec)/1e6;



      tms ts;

      double tck=sysconf(_SC_CLK_TCK);

      times(&ts);

      utime=ts.tms_utime/tck;

      stime=ts.tms_stime/tck;

      cutime=ts.tms_cutime/tck;

      cstime=ts.tms_cstime/tck;

#endif

    }



    std::string getWinFormattedDate()

    {

      std::ostringstream os;

#ifdef WIN32

      SYSTEMTIME time;

      GetSystemTime(&time);

      char buf1[11], buf2[9], buf3[5];

	  if (GetDateFormat(MY_LOCALE, 0, &time,

                        ("ddd MMM dd"), buf1, 11) &&

          GetTimeFormat(MY_LOCALE, 0, &time,

                        ("HH':'mm':'ss"), buf2, 9) &&

          GetDateFormat(MY_LOCALE, 0, &time,

                        ("yyyy"), buf3, 5)) {

        os << buf1 << ' ' << buf2 << ' ' << buf3;

      }

      else os << "unknown";

#else

      timeval tv;

      gettimeofday(&tv, 0);



      char cbuf[26];

      ctime_r(&tv.tv_sec,cbuf);

      os << cbuf;

#endif

      return os.str();

    }



    int getWinRndSeed()

    {

#ifdef WIN32

      FILETIME time;

      GetSystemTimeAsFileTime(&time);

      return GetCurrentProcessId() + time.dwHighDateTime + time.dwLowDateTime;

#else

      timeval tv;

      gettimeofday(&tv, 0);

      return getpid() + tv.tv_sec + tv.tv_usec;

#endif

    }

  }

}