Method DEFINE_VMETHOD_INTERPOSE

plugins/add-spatter.cpp:168–198

    typedef df::item_constructed interpose_base;

    DEFINE_VMETHOD_INTERPOSE(bool, isImprovable, (df::job *job, int16_t mat_type, int32_t mat_index))
    {
        ReactionInfo *info;

        if (job && job->job_type == job_type::CustomReaction &&
            (info = find_reaction(job->reaction_name)) != NULL)
        {
            if (!contaminants || contaminants->empty())
                return true;

            item_table table;
            index_items(table, job, info);

            for (size_t i = 0; i < info->products.size(); i++)
            {
                auto &product = info->products[i];

                int mattype, matindex;
                auto material = find_item(info->products[i].material, table);

                find_material(&mattype, &matindex, material, product.material);

                if (mattype < 0 || has_contaminant(this, mattype, matindex) >= 50)
                    return false;
            }

            return true;
        }

        return INTERPOSE_NEXT(isImprovable)(job, mat_type, mat_index);
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(item_hook, isImprovable);