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#include <algorithm>
#include <utility>
#include <vector>
typedef void* GzPointer;
typedef float GzCoord[3];

class Vertex
{
public:
    explicit Vertex(const GzCoord& vertex)
    {
        x = vertex[0];
        y = vertex[1];
        z = vertex[2];
    }
    static bool SortByY(const Vertex& v1, const Vertex& v2)
    {
        if (v1.y == v2.y)
            return v1.x < v2.x;

        return v1.y < v2.y;
    }
    float x;
    float y;
    float z;
};

Vertex CoordToVertex(const GzCoord& coord)
{
    return Vertex(coord);
}
static void RealTest()
{
    GzCoord coord[4] = {
        {3.0f, 1.0f, 3.0f}, 
        {2.0f, 2.0f, 2.0f}, 
        {1.0f, 2.0f, 2.0f}, 
        {1.0f, 1.0f, 3.0f}};

    std::vector<Vertex> vec;
    std::transform(coord, coord+4, std::back_inserter(vec), CoordToVertex);
    std::sort(vec.begin(), vec.end(), Vertex::SortByY);
}