How do I merge two containers efficiently with std::map in performance-sensitive code?

Merging two containers efficiently using std::map in C++ is crucial for performance-sensitive applications. This can be achieved using a combination of iterators and the insert method, which allows you to add elements from one map to another while avoiding duplication of keys.

Example of Merging Two std::map Containers

#include <iostream> #include <map> int main() { std::map map1 = { {1, "Apple"}, {2, "Banana"}, {3, "Cherry"} }; std::map map2 = { {3, "Date"}, {4, "Elderberry"}, {5, "Fig"} }; // Merging map2 into map1 for (const auto& pair : map2) { map1.insert(pair); // Key 3 will not be duplicated } // Displaying merged map for (const auto& pair : map1) { std::cout << pair.first << ": " << pair.second << std::endl; } return 0; }

C++ std::map merge containers performance efficient merging

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