C++ Hacking

gistfile1.cpp

#define _GLIBCXX_DEBUG
/* 
 * File:   main.cpp
 * Author: frebro
 *
 * Created on September 30, 2011, 5:26 PM
 */

#include <cstdlib>
#include <iostream>
#include <vector>
#include <set>
#include <algorithm>

#define tr(c, it) for(typeof(c.begin()) it = c.begin(); it != c.end() ; it++) 
#define all(c) (c).begin(), (c).end()

using namespace std;

typedef vector<int> VI;
typedef set<int> SI;

bool comp (double i, double j) { return (i<j); }

int main(int argc, char** argv) {
    
    int N;
    double x;
    
    cin >> N >> x;
    vector<double> v (N);
    vector<double>::iterator vit;
    
    for (int i = 0; i < v.size(); i++) {
        v[i] = -i/x;
    }
    
    sort (v.begin(), v.end(), comp);
    sort (all(v), comp); //alternative
    sort (all(v)); //standard comparator
    
    cout << v.size() << endl;
    cout << v.capacity() << endl;

    for (vit=v.begin(); vit!=v.begin()+v.size(); ++vit) {
        cout << " " << *vit;
    }
    
    tr (v, vit) { //alternative
        cout << " " << *vit;
    }

    cout << endl << endl;
    SI si1;
    si1.insert(5);
    si1.insert(3);
    si1.insert(7);
    tr(si1, it){
        cout << *it << " ";
    }
    
    cout << endl << endl;
    SI si2;
    si2.insert(6);
    si2.insert(5);
    
    VI vi(100);
    VI::iterator end = set_union(all(si1),all(si2), vi.begin());
    vi = VI(vi.begin(), end);
    tr(vi, it){
        cout << *it << " ";
    }
    
    VI myvi(4);
//    myvi[5]; //out of range crash
          
    return 0;
}