ex9_33.cpp

//
//  ex9_33.cpp
//  Exercise 9.33
//
//  Created by pezy on 12/3/14.
//  Copyright (c) 2014 pezy. All rights reserved.
//
//  @Brief  In the final example in this section what would happen
//          if we did not assign the result of insert to begin?
//          Write a program that omits this assignment to see if your
//          expectation was correct.
//  @Answer crash, cause the iterator is invalid after insert. Because
//  Iterators, pointers, and references to a
//          vector or string are invalid if the container was reallocated.

#include <iostream>
#include <vector>

using std::vector;
using std::cout;
using std::endl;

int main()
{
    vector<int> v{1, 2, 3, 4, 5, 6, 7, 8, 9};
    auto begin = v.begin();
    while (begin != v.end()) {
        ++begin;
        /*begin = */ v.insert(begin, 42);
        ++begin;
    }

    for (auto i : v) cout << i << " ";

    return 0;
}