Section: 27.2.3 [input.iterators] Status: NAD Submitter: Chris Jefferson Opened: 2004-12-13 Last modified: 2016-02-10
Priority: Not Prioritized
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1) In 24.1.1/3, the following text is currently present.
"Note: For input iterators, a==b does not imply ++a=++b (Equality does not guarantee the substitution property or referential transparency)."
However, when in Table 72, part of the definition of ++r is given as:
"pre: r is dereferenceable. post: any copies of the previous value of r are no longer required either to be dereferenceable ..."
While a==b does not imply that b is a copy of a, this statement should perhaps still be made more clear.
2) There are no changes to intended behaviour
3) This Note should be altered to say "Note: For input iterators a==b, when its behaviour is defined ++a==++b may still be false (Equality does not guarantee the substitution property or referential transparency).
This is descriptive text, not normative, and the meaning is clear.