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+//===- RangeType.h - Linalg RangeType definition --------------------------===//
+//
+// Copyright 2019 The MLIR Authors.
+//
+// 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
+//
+//   http://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 LINALG1_RANGETYPE_H_
+#define LINALG1_RANGETYPE_H_
+
+#include "linalg1/Types.h"
+#include "mlir/IR/Types.h"
+
+namespace mlir {
+class MLIRContext;
+}
+
+namespace linalg {
+
+/// A RangeType is the simplest possible form of a type in MLIR. It represents
+/// a minimal range abstraction (min, max, step). Since RangeType is constructed
+/// without any additional argument, this example illustrates the minimal
+/// amount of information required to implement a new custom MLIR type.
+class RangeType : public mlir::Type::TypeBase<RangeType, mlir::Type> {
+public:
+  // Used to implement llvm-style cast.
+  using Base::Base;
+  /// Construction hook.
+  static RangeType get(mlir::MLIRContext *context) {
+    /// Custom, uniqu'ed construction in the mlir::MLIRContext.
+    return Base::get(context, LinalgTypes::Range);
+  }
+  /// Used to implement llvm-style cast.
+  static bool kindof(unsigned kind) { return kind == LinalgTypes::Range; }
+};
+
+} // namespace linalg
+
+#endif // LINALG1_RANGETYPE_H_