How to map a bool to a 3d point struct with std::map?

Question

How do I use the following struct:

struct point 
{
    int x;
    int y;
    int z;
};

as a key for std::map

Answer 1

Just a guess guys,

bool operator<(const point& other) const
{
  return( memcmp( (void*) this, (void*) &other, sizeof(point)) < 0);
}

Of course, the order is kind of weird since x,y and z are signed values, but this should be suitable to order into a std::map, isn't it ?