Function isStoneMaterial

library/include/TileTypes.h:195–204

Stone materials - their tiles are completely interchangable

    // Stone materials - their tiles are completely interchangable
    inline bool isStoneMaterial(df::tiletype_material mat)
    {
        using namespace df::enums::tiletype_material;
        switch (mat) {
            case STONE: case LAVA_STONE: case MINERAL: case FEATURE:
                return true;
            default:
                return false;
        }
    }
    inline bool isStoneMaterial(df::tiletype tt) { return isStoneMaterial(tileMaterial(tt)); }

    // Regular ground materials = stone + soil