[John McMonagle]

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Thanks – namespace pollution was the source of my confusion I think also!

 

 

#include <iostream>
#include <vector>
#include <list>
#include <forward_list>
#include <concepts>

namespace john
{
    template<typename I, typename T>
    requires std::forward_iterator<I> && std::integral<T>
    void advance(I &iter, T n)
    {
        std::cout << "forward iterator" << "\n";
    }

    template<std::bidirectional_iterator I, std::integral T>
    void advance(I &iter, T n)
    {
        std::cout << "bidirectional iterator" << "\n";
    }

    template<std::random_access_iterator I, std::integral T>
    void advance(I &iter, T n)
    {
        std::cout << "random_access iterator" << "\n";
    }
}

int main()
{
    std::cout << "\n";

    std::forward_list fList{1, 2, 3};
    auto itFor = fList.begin();

    john::advance(itFor, 2.3f);

    std::list li{1, 2, 3};
    auto liter = li.begin();
    john::advance(liter, 2.5);

    std::vector vec{1, 2, 3};
    auto vIter = vec.begin();
    john::advance(vIter, 2);

    std::cout << "\n";
}

[John McMonagle]

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Maybe I didn’t describe it correctly, but if you check the video from 18:24 onwards, that should give you the context.

[John McMonagle]

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Welcome, Paul!

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