Function GetElementOr

tests/gtest/gtest-all.cc:692–695

// in range [0, v.size()).
template <typename E>
inline E GetElementOr(const std::vector<E>& v, int i, E default_value) {
  return (i < 0 || i >= static_cast<int>(v.size())) ? default_value
                                                    : v[static_cast<size_t>(i)];
}

// Performs an in-place shuffle of a range of the vector's elements.
// 'begin' and 'end' are element indices as an STL-style range;