JPredicate.cc

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

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

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


namespace {

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

    int 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::JPredicate 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 selection methods.");

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

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

  vector<__A__> buffer;

  buffer.push_back(__A__(3));
  buffer.push_back(__A__(4));
  buffer.push_back(__A__(2));
  buffer.push_back(__A__(1));
  buffer.push_back(__A__(5));


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

  int x = 3;

  {
    vector<__A__>::const_iterator p = find_if(buffer.begin(), buffer.end(), make_predicate(&__A__::a, x));

    DEBUG("has " << x << "? " << (p != buffer.end() ? "yes" : "no") << endl);

    ASSERT(p != buffer.end() && p->a == x);
  }

  {
    vector<__A__>::const_iterator p = find_if(buffer.begin(), buffer.end(), make_predicate(&__A__::get, x));

    DEBUG("has " << x << "? " << (p != buffer.end() ? "yes" : "no") << endl);

    ASSERT(p != buffer.end() && p->get() == x);
  }

  {
    vector<__A__>::iterator p = partition(buffer.begin(), buffer.end(), make_predicate(&__A__::a, x, JComparison::lt()));

    print(cout, debug, "selection:", buffer.begin(), p);

    for (vector<__A__>::iterator i = buffer.begin(); i != p; ++i) {
      ASSERT(i->a < x);
    }
  }

  return 0;
}