How do I merge and splice sequences with std::map?

Merging and splicing sequences with std::map can be a useful technique in C++. A std::map is an associative container that contains key-value pairs, allowing for efficient retrieval and management of data. By merging and splicing maps, you can efficiently combine data from different maps or move elements between them. Here’s an example to demonstrate how to merge and splice sequences using std::map in C++.


    #include <iostream>
    #include <map>

    int main() {
        // First map
        std::map<int, std::string> map1 = {
            {1, "Apple"},
            {2, "Banana"},
            {3, "Cherry"}
        };

        // Second map
        std::map<int, std::string> map2 = {
            {4, "Date"},
            {5, "Elderberry"},
            {6, "Fig"}
        };

        // Merging map2 into map1
        map1.insert(map2.begin(), map2.end());

        std::cout << "Merged Map:" << std::endl;
        for (const auto &pair : map1) {
            std::cout << pair.first << ": " << pair.second << std::endl;
        }

        // Splicing elements (moving) from map1 to map2
        map2.insert(map1.extract(1)); // Move key 1 from map1 to map2
        map1.erase(1); // Erase the element in map1

        std::cout << "After Splicing:" << std::endl;
        std::cout << "Map1:" << std::endl;
        for (const auto &pair : map1) {
            std::cout << pair.first << ": " << pair.second << std::endl;
        }

        std::cout << "Map2:" << std::endl;
        for (const auto &pair : map2) {
            std::cout << pair.first << ": " << pair.second << std::endl;
        }

        return 0;
    }

How do I merge and splice sequences with std::map?

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How do I merge and splice sequences with std::map?

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