cartographer: utils.h Source File

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00001 /*
00002  * Copyright 2018 The Cartographer Authors
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #ifndef CARTOGRAPHER_COMMON_UTILS_H_
00018 #define CARTOGRAPHER_COMMON_UTILS_H_
00019 
00020 namespace cartographer {
00021 namespace common {
00022 
00023 template <typename MapType, typename KeyType = typename MapType::key_type,
00024           typename ValueType = typename MapType::mapped_type>
00025 ValueType* FindOrNull(MapType& map, const KeyType& key) {
00026   auto it = map.find(key);
00027   if (it == map.end()) return nullptr;
00028   return &(it->second);
00029 }
00030 
00031 }  // namespace common
00032 }  // namespace cartographer
00033 
00034 #endif  // CARTOGRAPHER_COMMON_UTILS_H_