&gt;Are there any caveats? <br>:long may be not of a mahine word size on windows, for example.<br>CFFI, unfortunatly, does not have a :size-t or similiar type at the moment.<br><br>But, using trivial-features library(which is already used by cffi), on x86[-64] platform you could define it like this:<br>
(defctype :size-t #+x86-64 :uint64 #+x86 :uint32)<br>have no idea about other platforms, however<br>