gistfile1.cpp

template<typename InputIterator, typename T>
void fill_ap(InputIterator first, InputIterator last, T first_term, T common_difference)
{
	T n{};
	while (first != last)
	{
		*first = first_term + n * common_difference;
		++n;
		++first;
	}
}

template<typename OutputIterator, typename T>
void unfold_ap(T value, T first_term, T common_difference, OutputIterator result)
{
	T n{};
	while (value > T{})
	{
		T x = first_term + n * common_difference;
		*result = x;
		value -= x;
		++n;
	}
}