Re: [libvirt] Re: [PATCH] also allow use of XZ for Qemu image compression

Jim Meyering wrote: ... > At Chris' suggestion, I've added a comment warning not to do what I did ;-) > > To make it even more obvious that these numbers matter, > I've assigned explicit constants in the enum: > > + QEMUD_SAVE_FORMAT_RAW = 0, > + QEMUD_SAVE_FORMAT_GZIP = 1, > + QEMUD_SAVE_FORMAT_BZIP2 = 2, > > Currently, if someone accidentally adds this (mistakenly reused number): > > + QEMUD_SAVE_FORMAT_OOPS = 2, > > the compiler won't catch it. > However, with a small additional change to use VIR_ENUM_DECL > and VIR_ENUM_IMPL, thus replacing the if/elsif/ chains, > and the compiler *would* detect that mistake. > It'd also help to factor out the QEMUD_SAVE_FORMAT_<> to "<>" > association, rather than having literals like "gzip" and "bzip2" > in two places. > > Now that I've described that, I'll prepare a separate patch. This depends on the preceding patch.