I think that the STD should have one more variant of parial_sum which would
look like this:

template <class InputIterator, class OutputIterator, class BinaryOperation>
OutputIterator
partial_sum (InputIterator first, InputIterator last,
             OutputIterator result, BinaryOperation binary_op,
             typename iterator_traits<OutputIterator>::value_type init);

Where init would be inital value of the partial sum. Why? Because it would
allow me to do partial_sum over input collection that stores structures that
are not convertible to value_type with output to collection that stores
value_type.


VH



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