Function opt_set_alloc

ccan/ccan/opt/opt.c:303–310

}

void opt_set_alloc(void *(*allocfn)(size_t size),
		   void *(*reallocfn)(void *ptr, size_t size),
		   void (*freefn)(void *ptr))
{
	opt_alloc.alloc = allocfn;
	opt_alloc.realloc = reallocfn;
	opt_alloc.free = freefn;
}