#include <iostream>
#include "Book.h"
#include "Volume.h"
#include <vector>
#include <algorithm>
#include "Author.h"

struct CompareByAuthor {
  bool operator() ( const Text * t1, 
		    const Text * t2 ) {
    string a1, a2;
    t1->accept( author_ );
    a1 = author_.author();
    t2->accept( author_ );
    a2 = author_.author();
    return a1 < a2;
  }
private:
  Author author_;
};

int main() {
  cout << "esempio di ordinamento" << endl;

  Book b1 ( "Dante Alighieri", 
	    "La Divina Commedia" );
  Book b2 ( "Alessandro Manzoni", 
	    "I promessi sposi" );
  Book b3 ( "Erich Gamma et at.", 
	    "Design Patterns" );
  Volume v1 ( "J.R.R. Tolkien", "Il signore degli anelli", 1 );
  Volume v2 ( "J.R.R. Tolkien", "Il signore degli anelli", 2 );
  Volume v3 ( "J.R.R. Tolkien", "Il signore degli anelli", 3 );

  vector<Text *> v;
  v.push_back( &b1 );
  v.push_back( &b2 );
  v.push_back( &b3 );
  v.push_back( &v1 );
  v.push_back( &v2 );
  v.push_back( &v3 );
  
  vector<Text *>::const_iterator i;

  CompareByAuthor comp;
  sort( v.begin(), v.end(), comp );
  for( i = v.begin(); i != v.end(); i++ )
    (*i)->print();

  return 0;
}