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2015-07-01Improve reverse_iterate implementationBoris Kolpackov1-9/+6
If the passed range is an rvalue, then move it into our private copy. Otherwise, with nested ranges, there is no guarantee the thing will still be alive once we get to iterating over it.
2015-06-18Move some utilities from build2 to libbutlBoris Kolpackov1-0/+53