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

struct CompareByAuthor {
  bool operator() ( const Book& a, 
		    const Book& b ) const {
    return a.author() < b.author();
  }
};

struct CompareByTitle {
  bool operator() ( const Book& a, 
		    const Book& b ) const {
    return a.title() < b.title();
  }
};

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" );

  vector<Book> v;
  v.push_back( b1 );
  v.push_back( b2 );
  v.push_back( b3 );
  
  vector<Book>::const_iterator i;

  CompareByAuthor comp1;
  sort( v.begin(), v.end(), comp1 );
  for( i = v.begin(); i != v.end(); i++ )
    i->print();

  cout << "----------------------------" << endl;

  CompareByTitle comp2;
  sort( v.begin(), v.end(), comp2 );
  for( i = v.begin(); i != v.end(); i++ )
    i->print();

  return 0;
}