JTemplate.cc

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#include <iostream>
#include <string>
 
#include <istream>
#include <ostream>
 
#include "JLang/JTemplate.hh"
#include "JLang/JTypeList.hh"
#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"
 
 
namespace {
 
  struct __A__ :
    public std::string
  {
    __A__() {}
    __A__(const char* buffer) : std::string(buffer) {}
  };
 
  struct __B__ :
    public __A__
  {
    __B__() {}
    __B__(const char* buffer) : __A__(buffer) {}
  };
 
  struct __C__ :
    public __B__
  {
    __C__() {}
    __C__(const char* buffer) : __B__(buffer) {}
  };
}
 
 
/**
 * \file
 *
 * Example program to test JLANG::JTemplate class.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
 
  int          debug;
 
  try {
 
    JParser<> zap("Example program to test object referencing.");
 
    zap['d'] = make_field(debug)   = 3;
 
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }
 
  using namespace JPP;
 
 
  {
    JTemplate<string> object;
    
    object = string("aap");
 
    object.set(string("noot"));            // exact match
    object.set("mies");                    // implicit cast through std::string
    
    object.get<string>() += " says ";      // exact match 
    //object.get<int>();                   // gives compiler error
    
    object->append("\"hello world\"");     // smart pointer
    
    cout << object << endl;
  }
 
  {    
    class JTemplate_t :
      public JTemplate<JTYPELIST<std::string, float, int>::typelist>
    {};
    
    JTemplate_t object;
 
    object.get<string>() = "abc";          // exact match
    object.get<int>()    = -1;             // exact match
    object.get<float>()  = -0.99;          // exact match
 
    //object.set("hello world");           // gives compiler error
    object.set(string("aap noot mies"));   // exact match
    object.set<true>("hello world");       // allow cast
    object.set(777);                       // exact match
    object.set(123.456f);                  // exact match
    //object.set(123.456);                 // gives compiler error (argument is double)
    
    cout << object << endl;
  }
 
  {
    JTemplate<JTYPELIST<__C__, __B__, __A__>::typelist> object;
    
    object.get<__A__>() = "a";             // exact match
    object.get<__B__>() = "b";             // exact match
    object.get<__C__>() = "c";             // exact match
 
    cout << object.get<__C__>()            // exact match
         << " == "
         << object.get<__A__, true>()      // first match
         << endl;
  }
}