reinterpret_cast.cpp

reinterpret_cast.cpp

using Point = std::array<float, 2>;

int main()
{
    Point a = {1.1f, 2.1f};
    Point b = {1.5f, 2.5f};
    Point c = {5.5f, 3.5f};
    Point d = {4.5f, 1.5f};

    std::vector<Point> polygon;
    polygon.push_back(a);
    polygon.push_back(b);
    polygon.push_back(c);
    polygon.push_back(d);

    float *values = reinterpret_cast<float*>(polygon.data());
    for(size_t i=0; i < polygon.size() * 2; i++) {
        std::cout << values[i];
        std::cout << (i%2 == 0 ? "," : "\n");
    }
    std::cout << std::endl;
}

//Output:
//1.1,2.1
//1.5,2.5
//5.5,3.5
//4.5,1.5