JComparator.cc

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#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <iterator>

#include "JLang/JComparator.hh"
#include "JLang/JComparison.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


namespace {

  class __A__ {
  public:
    __A__(const double a)
    {
      this->a = a;
    }
    
    double get() const 
    { 
      return -a; 
    }
    
    friend inline std::ostream& operator<<(std::ostream& out, const __A__& object) { return out << object.a; }

    double a;
  };


  template<class T>
  void print(std::ostream& out, int debug, const char* title, T __begin, T __end)
  {
    using namespace std;
    using namespace JPP;

    if (debug >= debug_t) {
      out << title << endl;
      copy(__begin, __end, ostream_iterator<typename T::value_type>(out, " "));
      out << endl;
    }
  }
}


/**
 * \file
 *
 * Auxiliary program to test JLANG::JComparator class and helper methods.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;

  int         debug;

  try {

    JParser<> zap("Auxiliary program to test object comparison methods.");

    zap['d'] = make_field(debug)   = 3;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }

  typedef vector<__A__> buffer_type;

  buffer_type buffer;

  buffer.push_back(__A__(3.0));
  buffer.push_back(__A__(4.0));
  buffer.push_back(__A__(2.0));
  buffer.push_back(__A__(1.0));
  buffer.push_back(__A__(5.0));

  ASSERT(buffer.size() >= 2);

  print(cout, debug,
        "data",
        buffer.begin(), buffer.end());

  
  sort(buffer.begin(), buffer.end(), make_comparator(&__A__::get));

  print(cout, debug,
        "sort(.., make_comparator(&__A__::get))",
        buffer.begin(), buffer.end());

  for (buffer_type::const_iterator q = buffer.begin(), p = q++; q != buffer.end(); ++p, ++q) {
    ASSERT(p->get() < q->get());
  }


  sort(buffer.begin(), buffer.end(), make_comparator(&__A__::get, JComparison::gt()));

  print(cout, debug,
        "sort(.., make_comparator(&__A__::get, JComparison::gt()))",
        buffer.begin(), buffer.end());

  for (buffer_type::const_iterator q = buffer.begin(), p = q++; q != buffer.end(); ++p, ++q) {
    ASSERT(p->get() > q->get());
  }

  
  sort(buffer.begin(), buffer.end(), make_comparator(&__A__::a));

  print(cout, debug,
        "sort(.., make_comparator(&__A__::a))",
        buffer.begin(), buffer.end());

  for (buffer_type::const_iterator q = buffer.begin(), p = q++; q != buffer.end(); ++p, ++q) {
    ASSERT(p->a < q->a);
  }
  
  sort(buffer.begin(), buffer.end(), make_comparator(&__A__::a, JComparison::gt()));

  print(cout, debug,
        "sort(.., make_comparator(&__A__::a), JComparison::gt())",
        buffer.begin(), buffer.end());

  for (buffer_type::const_iterator q = buffer.begin(), p = q++; q != buffer.end(); ++p, ++q) {
    ASSERT(p->a > q->a);
  }

  return 0;
}