Detect whether the vector has an intersection

 #include <iostream>     // std::cout
#include <algorithm>    // std::find_if
#include <vector>       // std::vector

auto test(const std::vector< itk::Index<3>>& va, const std::vector< itk::Index<3>>& vb)
{
    bool result{ false };

    auto vbIter = std::find_if(vb.cbegin(), vb.cend(), [&va](const auto& bandItem)
    {
        auto vaIter = std::find_if(va.cbegin(), va.cend(), [&bandItem](const auto& nrBandItem)
        {
            return nrBandItem == bandItem;
        });
        return vaIter != va.cend();
    });
    result = (vbIter != vb.cend());

    return result;
}


int main(int, char *[])
{

  
    std::vector< itk::Index<3>> v1{ {0,1,2},{12,-10,25} };
        std::vector< itk::Index<3>> v2{ {0,1,2} };
        std::vector< itk::Index<3>> v3{ {1,2,3} };
  

        std::cout << test(v1, v2) << std::endl;
        std::cout << test(v1, v3) << std::endl;
return 0;

}