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C++ Template Metaprogramming

Solution: Tuplezip Algorithm

Explore the tuplezip algorithm in this lesson to understand how to combine elements from two input ranges into tuples using iterators. Learn to implement, execute, and analyze the tuplezip function step-by-step, and apply it to vectors to efficiently zip data for further processing.

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The tuplezip function for the std::tuple container

Let’s execute the provided solution for the tuplezip challenge and observe the code output. Subsequently, we’ll dissect the code step by step.

C++
#include <tuple>
#include <vector>
#include <iostream>
template <typename InputIt1, typename InputIt2, typename OutputIt>
OutputIt tuplezip(InputIt1 first1, InputIt1 last1,
   InputIt2 first2, InputIt2 last2, OutputIt dest)
{
    auto it1 = first1;
    auto it2 = first2;
    while (it1 != last1 && it2 != last2)
    {
        *dest++ = std::make_tuple(*it1, *it2);
        *it1++;
        *it2++;
    }
    return dest;
}
int main(){
    std::vector<int> range1 = {1, 2, 3, 4};
    std::vector<int> range2 = {5, 6, 7};
    std::vector<std::tuple<int, int>> result(range1.size() < range2.size() ? range1.size() : range2.size());
    auto result_end = tuplezip(range1.begin(), range1.end(), range2.begin(), range2.end(), result.begin());
    std::cout << "{ ";
    for (auto e : result)
        std::cout << "(" << std::get<0>(e) << "," << std::get<1>(e) << ") ";
    std::cout << "}" << std::endl;
}

Explanation

  • Lines 1–3: Include the necessary header files for our code. ...