Bug when redimensioning multi-dimension arrays?

[SMcNeill]

One question I have: how does QB64 store the LBOUNDS and UBOUNDS for an array? Could you point me to the data structure in source?

It seems that QB wants to keep all of the data in the array and just change the indexes that point to the data. Is that true? I'm not sure I understand the reasoning behind that, but I'd love to know.

The data structure is just an array. The bounds are stored in some of the array entries.

From our source in libqb.cpp:

Code: (Select All)

ptrszint func_lbound(ptrszint *array, int32 index, int32 num_indexes) {
    if ((index < 1) || (index > num_indexes) || ((array[2] & 1) == 0)) {
        error(9);
        return 0;
    }
    index = num_indexes - index + 1;
    return array[4 * index];
}

ptrszint func_ubound(ptrszint *array, int32 index, int32 num_indexes) {
    if ((index < 1) || (index > num_indexes) || ((array[2] & 1) == 0)) {
        error(9);
        return 0;
    }
    index = num_indexes - index + 1;
    return array[4 * index] + array[4 * index + 1] - 1;
}