How Can I Sort Multiple Vectors in C While Maintaining Synchronization Using Range-v3?

Sorting Zipped Locked Containers in C Using Range-v3

The Challenge

The task at hand involves sorting multiple vectors, or containers, while maintaining their synchronized order. Ideally, this sorting should occur without copying the containers into a tuple or struct.

Range-v3 Solution

Range-v3, a modern C library, provides a convenient approach to this problem. The following example demonstrates how to sort zipped containers using its extensive features:

#include <range/v3/all.hpp>
#include <iostream>

using namespace ranges;

int main() {
    std::vector<int> a1{15, 7, 3, 5};
    std::vector<int> a2{1, 2, 6, 21};

    // Zip and sort the containers
    sort(view::zip(a1, a2), std::less< std::pair<int, int> >{}, &std::pair<int, int>::first); 

    // Print the sorted vectors
    std::cout << view::all(a1) << '\n';
    std::cout << view::all(a2) << '\n';
}

Live Example

Explanation

1. The range::view::zip function is used to create a zipped view of the containers, providing access to their elements in a synchronized manner.
2. The std::sort function is applied to the zipped view, utilizing the std::less operator to determine the ordering. The &std::pair::first parameter specifies that the sorting should be performed based on the first element of each pair in the zipped view, which corresponds to the first vector.
3. By modifying the original vectors directly, this approach avoids unnecessary copying of data.

Conclusion

This Range-v3 solution provides an elegant and efficient way to sort multiple locked containers while preserving their synchronized order. It highlights the power of Range-v3 for solving complex data manipulation challenges in C .

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