Question

I have a struct defined as:

typedef struct {
   int type;
   void* info;
} Data;

and then i have several other structs that i want to assign to the void* using the following function:

Data* insert_data(int t, void* s)
{
    Data * d = (Data*)malloc(sizeof(Data));
    d->type = t;
    d->info = s;

    return d;
}

struct {
   ...
} Struct#;

then i just call

insert_data(1, variable_of_type_Struct#);

When i compile this it gives a warning

warning: assignment from incompatible pointer type

i tried to cast the variable in the insert to (void*) but didn’t work

insert_data(1, (void *) variable_of_type_Struct#);

How can i get rid of this warning?

Thanks

Answer 1

Pass in the address of the struct, not a copy of it (i.e. not passed by value):

insert_data(1, &variable_of_type_Struct);