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diff --git a/src/util.h b/src/util.h
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+// Copyright 2021 Benjamin Barenblat
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#ifndef GLPLANET_SRC_UTIL_H_
+#define GLPLANET_SRC_UTIL_H_
+
+#include <assert.h>
+
+#include "third_party/abseil/absl/meta/type_traits.h"
+
+// A variant of assert that always evaluates its arguments, even when assertions
+// are disabled.
+#ifdef NDEBUG
+#define DCHECK(x) (void)(x)
+#else
+#define DCHECK(x) assert(x)
+#endif
+
+template <typename T>
+constexpr absl::underlying_type_t<T> FromEnum(T x) {
+  return static_cast<absl::underlying_type_t<T>>(x);
+}
+
+#endif  // GLPLANET_SRC_GL_UTIL_H_