simple-vector.cpp

template<int D>
struct Vector {
  static constexpr unsigned N = D;
  int data[N];
  
  Vector(Vector<D> const& v) {
    for (int i = 0; i < N; ++i) {
      data[i] = v[i];
    }
  }

  Vector(int fill = 0) {
    for (int i = 0; i < N; ++i) {
      data[i] = fill;
    }
  }

  int sum() const {
    int result = 0;
    for (int i = 0; i < N; ++i) {
      result += data[i];
    }
    return result;
  }

  int* begin() { return &data[0]; }
  int* end() { return &data[N]; }

  int const* begin() const { return &data[0]; }
  int const* end() const { return &data[N]; }

  int& operator[] (unsigned const& i) {
    if (N <= i) throw "out of bound";
    return data[i];
  }

  int const& operator[] (unsigned const& i) const {
    if (N <= i) throw "out of bound";
    return data[i];
  }
};