feat: parse wavefront as string lines

src/helper.hpp

@@ -12,4 +12,14 @@ constexpr std::array<T, N> array_fill(const T& value) {
     return array;
 }
 
+template<typename F, std::size_t... I>
+constexpr void _static_for_impl(F &&f, std::index_sequence<I...>) {
+    (f(std::integral_constant<std::size_t, I>{}), ...);
+}
+
+template<std::size_t N, typename F>
+constexpr void static_for(F &&f) {
+    _static_for_impl(std::forward<F>(f), std::make_index_sequence<N>{});
+}
+
 #endif // APP_HELPER_H