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

The std::forward_list container in C++ provides a lightweight alternative to std::list for singly-linked sequences. Merging and splicing are two useful operations that allow you to combine or reposition elements effectively.

Merging Sequences

To merge two std::forward_list sequences, you can use the merge member function. This function requires both lists to be sorted.

Splicing Sequences

The splice_after function allows you to move elements from one std::forward_list to another efficiently.

Example:


        #include <forward_list>
        #include <iostream>
        
        int main() {
            std::forward_list<int> list1 = {1, 3, 5};
            std::forward_list<int> list2 = {2, 4, 6};
            
            // Merging sorted lists
            list1.sort();
            list2.sort();
            list1.merge(list2);
            
            // Output merged list
            std::cout << "Merged list: ";
            for (const auto &val : list1) {
                std::cout << val << " ";
            }
            std::cout << std::endl;

            // Splicing elements from list1 to list2
            std::forward_list<int> list3 = {7, 9};
            list2.splice_after(list2.before_begin(), list1, list1.before_begin(), list1.end());
            
            // Output spliced list
            std::cout << "Spliced list2: ";
            for (const auto &val : list2) {
                std::cout << val << " ";
            }
            std::cout << std::endl;

            return 0;
        }

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

Merging Sequences

Splicing Sequences

Example:

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

Merging Sequences

Splicing Sequences

Example:

Related Questions

Popular Topics

Recent Languages