C++ vectors fun.

cpp-vectors-example.cpp

#include <iostream>
#include <vector>

using namespace std;

struct test {
    int a;
    long b;
};

int main() {

  unsigned int expectedSize = 100;

  vector<test> data;
  data.reserve(expectedSize);

  auto it = data.begin();
  for (unsigned int i = 0; i < expectedSize; i++) {

      // Do something
      test t;
      t.a = i;

      // Put in vector - no error at all
      (*it) = t;
      it++;
  }

  cout << "expectedSize = " << expectedSize << endl;
  cout << "data.size() = " << data.size() << endl;
  cout << "data.capacity() = " << data.capacity() << endl;

  // Dependent on implementation
  cout << endl << "data[2891] = " << data[2891].a << endl;
  // cout << endl << "data[2892] = " << data[2892].a << endl; // Gives segfault

  return 0;
}