1 // Copyright 2017 The TensorFlow Authors. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // ============================================================================= 15 16 #ifndef TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_UTILS_OPTIONAL_VALUE_H_ 17 #define TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_UTILS_OPTIONAL_VALUE_H_ 18 19 #include "tensorflow/core/platform/logging.h" 20 21 namespace tensorflow { 22 namespace boosted_trees { 23 namespace utils { 24 25 // Utility class holding an optional value. 26 template <typename T> 27 class OptionalValue { 28 public: OptionalValue()29 OptionalValue() : value_(), has_value_(false) {} OptionalValue(T value)30 explicit OptionalValue(T value) : value_(value), has_value_(true) {} 31 has_value()32 bool has_value() const { return has_value_; } get_value()33 const T& get_value() const { 34 QCHECK(has_value()); 35 return value_; 36 } 37 38 private: 39 T value_; 40 bool has_value_; 41 }; 42 43 } // namespace utils 44 } // namespace boosted_trees 45 } // namespace tensorflow 46 47 #endif // TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_UTILS_OPTIONAL_VALUE_H_ 48