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692. get_money and put_money should be formatted I/O functions

Section: 31.7.8 [ext.manip] Status: CD1 Submitter: Martin Sebor Opened: 2007-06-22 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

In a private email Bill Plauger notes:

I believe that the function that implements get_money [from N2072] should behave as a formatted input function, and the function that implements put_money should behave as a formatted output function. This has implications regarding the skipping of whitespace and the handling of errors, among other things.

The words don't say that right now and I'm far from convinced that such a change is editorial.

Martin's response:

I agree that the manipulators should handle exceptions the same way as formatted I/O functions do. The text in N2072 assumes so but the Returns clause explicitly omits exception handling for the sake of brevity. The spec should be clarified to that effect.

As for dealing with whitespace, I also agree it would make sense for the extractors and inserters involving the new manipulators to treat it the same way as formatted I/O.

Proposed resolution:

Add a new paragraph immediately above p4 of 31.7.8 [ext.manip] with the following text:

Effects: The expression in >> get_money(mon, intl) described below behaves as a formatted input function (as described in 31.7.5.3.1 [istream.formatted.reqmts]).

Also change p4 of 31.7.8 [ext.manip] as follows:

Returns: An object s of unspecified type such that if in is an object of type basic_istream<charT, traits> then the expression in >> get_money(mon, intl) behaves as a formatted input function that calls f(in, mon, intl) were called. The function f can be defined as...

[ post Bellevue: ]

We recommend moving immediately to Review. We've looked at the issue and have a consensus that the proposed resolution is correct, but want an iostream expert to sign off. Alisdair has taken the action item to putt this up on the reflector for possible movement by Howard to Tenatively Ready.