Generic data type in C [ void * ] [duplicate]

Answer 1

You're overwriting the pointer, then dereferencing it... if your code looked like this it would work... but that may not be what you're after.

    int int_out;
    store   ( storage_int, &int_in, sizeof(int));
    retrive ( &int_out, storage_int, sizeof(int));
    assert  ( 55 == int_out);

or:

    int *int_out;
    store   ( storage_int, &int_in, sizeof(int));
    retrive ( &int_out, storage_int, sizeof(int));
    assert  ( 55 == (int)int_out);

However, in the second case this is a bit dubious, because it assumes that both 'int' and 'int*' are the same size, so you're able to store one on top of the other when retrieving. I believe this isn't the case on all systems.