Hi! Thanks for contributing. I'll look through this more thoroughly when I can, hopefully tonight or tomorrow. At glance I'm confused by the example output in the README edit. "up" never prints? Can you verify the output is right? thanks.

It's just a little part of the output - there is ellipsis.
4 мая 2016 г. 19:02 пользователь "Ryan Haining" notifications@github.com
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Hi! Thanks for contributing. I'll look through this more thoroughly when I
can, hopefully tonight or tomorrow. At glance I'm confused by the example
output in the README edit. "up" never prints? Can you verify the output
is right? thanks.

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#26 (comment)

I'm seeing this as being the same output as product but in a different order. If I replace all the ResType alias to be multiset instead of vector, then replace every call to mixed_product with a call to product, your test file still passes. Could you add a test case that demonstrates that they are different?

Yes. The output is same as product, but in different order. It was the main point.
It's not very easy when you have only forward iterators, low memory and don't want the situation when the values are repeated from step to step.

Example:
file1 - 50MB
file2 - 50MB
I have machine with 512MB and want line-by-line Cartesian project of these files. But I don't want to repeat lines from step to step. So I have to move every iterator - in the first file and in the second.

Nit: there's no such thing as a "Cartesian project".

@aldanor -- sure, it was a typo, but this paper begs to differ.

@dnbaker ^ in the context of mathematics and algorithms, that is...

It's just a funny. That's all! :)