JComparisonAvailable.cc

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#include <iostream>
#include <iomanip>
 
#include "JLang/JComparable.hh"
#include "JLang/JEquals.hh"
#include "JLang/JMultiEquals.hh"
#include "JLang/JComparisonAvailable.hh"
 
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"
 
 
namespace {
 
  using namespace JPP;
  
 
  struct __A__ {};
  struct __B__ {};
  struct __C__ : public __B__ {};
 
  struct __D__ : 
    public JComparable<__D__>
  {
    bool less(const __D__& object) const { return true; }
  };
 
  inline bool operator!=(const __A__& first, const __A__& second) { return false; }
  inline bool operator< (const __B__& first, const __B__& second) { return false; }
  inline bool operator> (const __B__& first, const __B__& second) { return false; }
 
  struct __E__ :
    public __A__,
    public __D__,
    // adddition of this base class solves the ambiguity problem.
    public JMultiEquals<__E__, JTYPELIST<__A__, __D__>::typelist>
  {};
}
 
/**
 * Print availabilty of comparison operators.
 *
 * \param  OUT       output stream
 * \param  CLASS     class name
 */
#define PRINT(OUT, CLASS) \
  OUT << std::setw(6) << std::left << #CLASS << ' ' ;           \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_eq << ' ';     \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_ne << ' ';     \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_lt << ' ';     \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_gt << ' ';     \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_le << ' ';     \
  OUT << ' ' << JComparisonAvailable<CLASS>::has_ge << std::endl;
 
 
/**
 * \file
 *
 * Example program to test JLANG::JComparisonAvailable and JLANG::JComparable classes.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;
 
  int debug;
 
  try {
 
    JParser<> zap("Example program to test availability of object comparisons.");
 
    zap['d'] = make_field(debug)     = 3;
 
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }
 
  if (debug >= debug_t) {
 
    cout << setw(6) << left << "class" << ' ' << "eq ne lt gt le ge" << endl;
 
    PRINT(cout, __A__);
    PRINT(cout, __B__);
    PRINT(cout, __C__);
    PRINT(cout, __D__);
    PRINT(cout, __E__);
  }
 
  ASSERT(JComparisonAvailable<__A__>::has_eq == false);
  ASSERT(JComparisonAvailable<__A__>::has_ne == true);
  ASSERT(JComparisonAvailable<__A__>::has_lt == false);
  ASSERT(JComparisonAvailable<__A__>::has_le == false);
  ASSERT(JComparisonAvailable<__A__>::has_gt == false);
  ASSERT(JComparisonAvailable<__A__>::has_ge == false);
  
  ASSERT(JComparisonAvailable<__C__>::has_eq == false);
  ASSERT(JComparisonAvailable<__C__>::has_ne == false);
  ASSERT(JComparisonAvailable<__C__>::has_lt == true);
  ASSERT(JComparisonAvailable<__C__>::has_le == false);
  ASSERT(JComparisonAvailable<__C__>::has_gt == true);
  ASSERT(JComparisonAvailable<__C__>::has_ge == false);
  
  ASSERT(JComparisonAvailable<__D__>::has_eq == true);
  ASSERT(JComparisonAvailable<__D__>::has_ne == true);
  ASSERT(JComparisonAvailable<__D__>::has_lt == true);
  ASSERT(JComparisonAvailable<__D__>::has_le == true);
  ASSERT(JComparisonAvailable<__D__>::has_gt == true);
  ASSERT(JComparisonAvailable<__D__>::has_ge == true);
  
  ASSERT(JComparisonAvailable<__E__>::has_eq == true);
  ASSERT(JComparisonAvailable<__E__>::has_ne == true);
  ASSERT(JComparisonAvailable<__E__>::has_lt == true);
  ASSERT(JComparisonAvailable<__E__>::has_le == true);
  ASSERT(JComparisonAvailable<__E__>::has_gt == true);
  ASSERT(JComparisonAvailable<__E__>::has_ge == true);
 
  return 0;
}