Function destructor

ThirdParty/libproj/vtklibproj/src/transformations/defmodel.cpp:335–344

} // namespace

static PJ *destructor(PJ *P, int errlev) {
    if (nullptr == P)
        return nullptr;

    auto Q = static_cast<struct defmodelData *>(P->opaque);
    delete Q;
    P->opaque = nullptr;

    return pj_default_destructor(P, errlev);
}

static PJ_COORD forward_4d(PJ_COORD in, PJ *P) {
    auto *Q = (struct defmodelData *)P->opaque;