[Bug libstdc++/22634] partial_sum is too constrained

["squell at alumina dot nl" <gcc-bugzilla@gcc.gnu.org>]

------- Additional Comments From squell at alumina dot nl  2005-07-25 14:01 -------
(In reply to comment #13)
> I've attached the work-around I personally use to this kind of problem, which is
> wrapping the iterator in another iterator which changes the value_type. 

I tried this approach as well :) I called it a 'cast_iterator'. However,
writing a full iterator class is involved, especially if you don't want to 
restrict the iterator class to 'input_iterator_tag'.

Second, I felt it was 'writing to the implementation'. I know that libstdc++
uses the 'value_type' to determine the type, but this doesn't mean other
implementations use it! In the end, it is a non-solution.

If you've want the non-expanding behaviour, this will always be possible by
simply using a function object. For example;

   std::partial_sum(begin, end, std::plus<char>())

This is *guaranteed* not to expand.

~Marc.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22634