How to Free Memory of A Structure with Pointers to another Structure

Question

I have two structures

struct SimpleXY
{
    double x;
    double y;

};

    struct SimpleXyLink
    {
            int num_xy;
            SimpleXY *simpleXyList         


        

Answer 1

This entirely depends on how you allocated the memory. Freeing memory always has to echo the allocation.

That said, free is almost certainly wrong in C++. Use new/delete instead of malloc/free.

Furthermore, it seems as though you’re allocating memory for several elements her (at least the name …List implies this) so you will probably be better off using a C++ container structure, such as vector or list.