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Section: 184.108.40.206 [structure.specifications] Status: C++11 Submitter: Thomas Plum Opened: 2009-03-03 Last modified: 2016-01-28
Priority: Not Prioritized
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Addresses UK-163 [CD1]
Many functions are defined as "Effects: Equivalent to a...", which seems to also define the preconditions, effects, etc. But this is not made clear.
After studying the occurrences of "Effects: Equivalent to", I agree with the diagnosis but disagree with the solution. In 220.127.116.11 [string.cons] we find
14 Effects: If InputIterator is an integral type, equivalent to basic_string(static_cast<size_type>(begin), static_cast<value_type>(end), a)
15 Otherwise constructs a string from the values in the range [begin, end), as indicated in the Sequence Requirements table (see 23.1.3).
This would be devishly difficult to re-write with an explicit "Equivalent to:" clause. Instead, I propose the following, which will result in much less editorial re-work.
[ 2009-05-09 Alisdair adds: ]
This issue is related to 492.
[ Batavia (2009-05): ]
We agree with the proposed resolution. Move to Tentatively Ready.
Add a new paragraph after 18.104.22.168 [structure.specifications], p3:
-3- Descriptions of function semantics contain the following elements (as appropriate):154
- Requires: the preconditions for calling the function
- Effects: the actions performed by the function
- Postconditions: the observable results established by the function
- Returns: a description of the value(s) returned by the function
- Throws: any exceptions thrown by the function, and the conditions that would cause the exception
- Complexity: the time and/or space complexity of the function
- Remarks: additional semantic constraints on the function
- Error conditions: the error conditions for error codes reported by the function.
- Notes: non-normative comments about the function