On 03/12/08 08:22, Max Motovilov wrote: [snip]
A solution is posted here:
http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?CPPTM_Answers...
It would be interesting to compare the two solutions. The exercise just specified 2 input sequences whereas your's allows (I guess) any n>0 number of input sequences.
No, they don't look similar. As far as I can tell from a one-minute look, the solution is simply a nested for_each loop and does not provide an actual sequence adapter, despite the name cross_product_view. [snip] From one of your previous post's, the output is a crossproduct which requires a nested for_each loop to printout first the rows and for each row the elements in that row. That's the only reason for the static print_each and struct element_printer. I realize now that should have been commented to indicate it was not part of the solution but only used to demonstrate the correctness, which I hoped the printout:
Running 2 test cases... row.col=0.100 row.col=0.101 row.col=0.102 ... would have demonstrated. Also, I am not sure that cross_product_view: does not provide an actual sequence adapter because the superclass of cross_product_view is a transform_view and the first page of chapter 7 states: A sequence view ... is a lazy adapter So, in view of that, could you explain why it's not a sequence adapter?