将以下格式的两个哈希表合并为一个的c++代码stdunordered_mapstdstring Slice sliceMap;

std::unordered_map<std::string, Slice> sliceMap1; std::unordered_map<std::string, Slice> sliceMap2;

std::unordered_map<std::string, Slice> mergedSliceMap; mergedSliceMap.insert(sliceMap1.begin(), sliceMap1.end()); mergedSliceMap.insert(sliceMap2.begin(), sliceMap2.end());