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diff --git a/cmdline/cmdline_type_parser.h b/cmdline/cmdline_type_parser.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 ART_CMDLINE_CMDLINE_TYPE_PARSER_H_
+#define ART_CMDLINE_CMDLINE_TYPE_PARSER_H_
+
+#include "cmdline_parse_result.h"
+
+namespace art {
+
+// Base class for user-defined CmdlineType<T> specializations.
+//
+// Not strictly necessary, but if the specializations fail to Define all of these functions
+// the compilation will fail.
+template <typename T>
+struct CmdlineTypeParser {
+  // Return value of parsing attempts. Represents a Success(T value) or an Error(int code)
+  using Result = CmdlineParseResult<T>;
+
+  // Parse a single value for an argument definition out of the wildcard component.
+  //
+  // e.g. if the argument definition was "foo:_", and the user-provided input was "foo:bar",
+  // then args is "bar".
+  Result Parse(const std::string& args ATTRIBUTE_UNUSED) {
+    assert(false);
+    return Result::Failure("Missing type specialization and/or value map");
+  }
+
+  // Parse a value and append it into the existing value so far, for argument
+  // definitions which are marked with AppendValues().
+  //
+  // The value is parsed out of the wildcard component as in Parse.
+  //
+  // If the initial value does not exist yet, a default value is created by
+  // value-initializing with 'T()'.
+  Result ParseAndAppend(const std::string& args ATTRIBUTE_UNUSED,
+                        T& existing_value ATTRIBUTE_UNUSED) {
+    assert(false);
+    return Result::Failure("Missing type specialization and/or value map");
+  }
+
+  // Runtime type name of T, so that we can print more useful error messages.
+  static const char* Name() { assert(false); return "UnspecializedType"; }
+
+  // Whether or not your type can parse argument definitions defined without a "_"
+  // e.g. -Xenable-profiler just mutates the existing profiler struct in-place
+  // so it doesn't need to do any parsing other than token recognition.
+  //
+  // If this is false, then either the argument definition has a _, from which the parsing
+  // happens, or the tokens get mapped to a value list/map from which a 1:1 matching occurs.
+  //
+  // This should almost *always* be false!
+  static constexpr bool kCanParseBlankless = false;
+
+ protected:
+  // Don't accidentally initialize instances of this directly; they will assert at runtime.
+  CmdlineTypeParser() = default;
+};
+
+
+}  // namespace art
+
+#endif  // ART_CMDLINE_CMDLINE_TYPE_PARSER_H_