safety.cpp

// Illustrate disciplined C++ code

// http://www.cplusplus.com/reference/vector/vector/
#include <vector>
#include <iostream>

using namespace std;

class Foo {
public:
  virtual ~Foo() {
    cout << "destroying foo" << endl;
  }
};

auto main() -> int {
  try {
    // Prevent memory leak.
    const auto foo = make_shared<Foo>();

    const vector<int> v { 3, 1, 4 };

    // Note that v[i] does not do bounds checking, but v.at(i) does.
    // http://www.cplusplus.com/reference/vector/vector/at/
    for (int i = 0; i < 4; i++) {
      const auto x = v.at(i);
      cout << "v at " << i << " is " << x << endl;
    }
  }
  catch(const exception &e) {
    cout << "caught exception: "<<  e.what() << endl;
  }
}

Output:

v at 0 is 3
v at 1 is 1
v at 2 is 4
destroying foo
caught exception: vector