> The great thing about [passing structs by copy] is that it allows us to omit to allocate structs with malloc on the heap. Instead, we could create a struct on

> The great thing about [passing structs by copy] is that it allows us to omit to allocate structs with malloc on the heap. Instead, we could create a struct on the stack and pass it around by copying it. This opens the door to new approaches for writing safer C code. You don’t have to heap-allocate structs to pass by pointer; you can pass a pointer to a struct living on the stack. Even if you are talking about returning a struct, you can just take a pointer to memory allocated in some previous stack frame and mutate it—this avoids the allocation and thus preserves safety and performance. But yes, being able to pass structs by copy is nice too.