Sorting zipped (locked) containers in C++ using boost or the STL

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Here’s a working example based on the range-v3 Library that has been proposed for Standardization

#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};
    sort(view::zip(a1, a2), std::less<>{}, &std::pair<int, int>::first); 
    std::cout << view::all(a1) << '\n';
    std::cout << view::all(a2) << '\n';
}

Live Example (requires recent compiler with good C++14 support, not VS 2015).

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