JTypedef.cc

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#include <iostream>
#include <iomanip>
 
#include "JLang/JVoid.hh"
 
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"
 
 
namespace {
 
  using namespace JPP;
  
  struct __A__ {
    typedef int data_type;
  };
  
  struct __B__ {
  };
 
  template<class T, class JType_t = void>
  struct JTypedef
  {
    static const bool has_typedef = false;
  };
 
  template<class T>
  struct JTypedef<T, typename JVoid<typename T::data_type>::type>
  {
    static const bool has_typedef = true;
  };
  
  
#define PRINT(OUT, T) OUT << #T << ": typedef = " << JTypedef<T>::has_typedef << endl; 
}
 
 
/**
 * \file
 *
 * Example program to test JLANG::JTypedef class.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
 
  int          debug;
 
  try {
 
    JParser<> zap("Example program to test type defs.");
 
    zap['d'] = make_field(debug)   = 3;
 
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }
 
 
  PRINT(cout, __A__);
  PRINT(cout, __B__);
}