cartographer/cartographer/common/utils.h

35 lines
1.1 KiB
C++

/*
* Copyright 2018 The Cartographer 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 CARTOGRAPHER_COMMON_UTILS_H_
#define CARTOGRAPHER_COMMON_UTILS_H_
namespace cartographer {
namespace common {
template <typename MapType, typename KeyType = typename MapType::key_type,
typename ValueType = typename MapType::mapped_type>
ValueType* FindOrNull(MapType& map, const KeyType& key) {
auto it = map.find(key);
if (it == map.end()) return nullptr;
return &(it->second);
}
} // namespace common
} // namespace cartographer
#endif // CARTOGRAPHER_COMMON_UTILS_H_