meta.cpp

struct tree{
    int meta[3];
    int value;
    tree *left;
    tree *right;

    tree() {
        meta[0] = 2; //pointers count
        meta[1] = sizeof(int) * 4; // offset to left
        meta[2] = meta[1] + sizeof(tree*); // offset to right
        .... // another initialization
    } 
};