Question

Note that I’m 95% unfamiliar with pointers.

So here’s my dilemma, I have a structure let’s call it foo

struct foo{
int a;
}

so let’s create an instance of foo

foo test;

Now I want to assign a void pointer to point to this

 void *ptest;
 ptest = &test;

This all works great, but when it comes to modifying the contents (ie int a within foo), I’m not sure how to approach this. I tried static_cast like this:

static_cast<foo*>(ptest).a=0; 

but that didn’t work either. Any help would be appreciated. Thanks

Answer 1

You’re casting it to a pointer, thus you need to dereference it using the * operator or use the -> operator.

Option A:

*(static_cast<foo*>(ptest)).a=0

Option B:

static_cast<foo*>(ptest)->a=0