Question

I’ve these plain C functions from a library:

struct SAlloc;
SAlloc *new_salloc();
void   free_salloc(SAlloc *s);

Is there any way I can wrap this in C++ to a smart pointer (std::unique_ptr), or otherwise a RAII wrapper ?

I’m mainly curious about the possibilities of the standard library without creating my own wrapper/class.

Answer 1

Yes, you can reuse unique_ptr for this. Just make a custom deleter.

struct salloc_deleter {
    void operator()(SAlloc* s) const {
        free_salloc(s); // what the heck is the return value for?
    }
}

using salloc_ptr = std::unique_ptr<SAlloc, salloc_deleter>;