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

In C++, the std::unordered_set is a container that provides fast access to elements and allows for unique values. Merging and splicing sequences with std::unordered_set involves inserting elements from one set to another while maintaining uniqueness.

Here’s a quick overview of how to merge two std::unordered_set instances:

Declare two std::unordered_set instances and populate them with values.
Use the insert method to add elements from one set to the other.

Splicing, however, is not a direct operation since the std::unordered_set does not support splicing like std::list or std::deque. Instead, you would typically use the erase method to remove items from one set after they've been added to another.


        #include <iostream>
        #include <unordered_set>

        int main() {
            std::unordered_set set1 = {1, 2, 3};
            std::unordered_set set2 = {3, 4, 5};

            // Merge set2 into set1
            set1.insert(set2.begin(), set2.end());

            std::cout << "Merged set: ";
            for (int num : set1) {
                std::cout << num << ' ';
            }
            std::cout << std::endl;

            // Optional: clear set2 after merging (splicing)
            set2.clear();
            
            return 0;
        }

C++ std::unordered_set merge splice unique values container C++ example

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

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

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