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Change the CompletionCondition concept so that:
- It is now evaluated before the first call to the underlying
*_some() operation, as well as after every operation.
- The return value is a number of bytes, which indicates the maximum
length to be transferred on the subsequent *_some() operation. If
the return value is 0 then the composed operation completes.
Add missing unit tests for read_at and write_at.
[SVN r48418]
Christopher Kohlhoff