copy to void* pointer

Question

I have a function `getData(void* data)` which should copy to data some internal calculated values for example `int r = getRadius();` r should be copied to data ,and is such a way returned from function getData what is the correct way to do it? I tried `*(int*)data = r;` but I am not sure this is a best solution.

Accepted Answer

If you are certain that the memory referenced by the void pointer is an int, then you can be confident in

```
*(int *)data = r;
```

However a better general solution is:

```
memcpy(data, &r, sizeof(int));
```

This way you don't have to worry about byte alignment or other potential gotchas.

copy to void* pointer

Solution

Problem