/*
 *
 * Copyright 2019 gRPC 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 GRPC_CORE_LIB_GPRPP_OPTIONAL_H
#define GRPC_CORE_LIB_GPRPP_OPTIONAL_H

namespace grpc_core {

/* A make-shift alternative for absl::Optional. This can be removed in favor of
 * that once absl dependencies can be introduced. */
template <typename T>
class Optional {
 public:
  void set(const T& val) {
    value_ = val;
    set_ = true;
  }

  bool has_value() const { return set_; }

  void reset() { set_ = false; }

  T value() const { return value_; }

 private:
  T value_;
  bool set_ = false;
};

} /* namespace grpc_core */

#endif /* GRPC_CORE_LIB_GPRPP_OPTIONAL_H */

/*
 *
 * Copyright 2019 gRPC 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 GRPC_CORE_LIB_GPRPP_OPTIONAL_H
#define GRPC_CORE_LIB_GPRPP_OPTIONAL_H

namespace grpc_core {

/* A make-shift alternative for absl::Optional. This can be removed in favor of
 * that once absl dependencies can be introduced. */
template <typename T>
class Optional {
 public:
  void set(const T& val) {
    value_ = val;
    set_ = true;
  }

  bool has_value() { return set_; }

  void reset() { set_ = false; }

  T value() { return value_; }

 private:
  T value_;
  bool set_ = false;
};

} /* namespace grpc_core */

#endif /* GRPC_CORE_LIB_GPRPP_OPTIONAL_H */

--- 
+++ 
@@ -31,11 +31,11 @@
     set_ = true;
   }
 
-  bool has_value() { return set_; }
+  bool has_value() const { return set_; }
 
   void reset() { set_ = false; }
 
-  T value() { return value_; }
+  T value() const { return value_; }
 
  private:
   T value_;
Add const qualifiers to member methods in Optional
