How to get the index of a value in a vector using for_each?

Question

I have the following code (compiler: MSVC++ 10):

std::vector data;
data.push_back(1.0f);
data.push_back(1.0f);
data.push_back(2.0f);

// lambda          


        

Answer 1

Something like this:

template 
FunctionT enumerate(IteratorT first, 
                    IteratorT last, 
                    typename std::iterator_traits::difference_type initial,
                    FunctionT func)
{
    for (;first != last; ++first, ++initial)
        func(initial, *first);
    return func;
}

Used as:

enumerate(data.begin(), data.end(), 0, [](unsigned index, float val)
{
    std::cout << index << " " << val << std::endl;
});