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### 41. Ios_base needs clear(), exceptions()

Section: 29.5.2 [ios.base] Status: TC1 Submitter: Nathan Myers Opened: 1998-08-06 Last modified: 2016-01-28

Priority: Not Prioritized

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Duplicate of: 157

Discussion:

The description of ios_base::iword() and pword() in 29.5.2.5 [ios.members.static], say that if they fail, they "set badbit, which may throw an exception". However, ios_base offers no interface to set or to test badbit; those interfaces are defined in basic_ios<>.

Proposed resolution:

Change the description in 29.5.2.6 [ios.base.storage] in paragraph 2, and also in paragraph 4, as follows. Replace

> If the function fails it sets badbit, which may throw an exception.

with

> If the function fails, and `*this` is a base sub-object of a `basic_ios<>` object or sub-object, the effect is equivalent to calling `basic_ios<>::setstate(badbit)` on the derived object (which may throw `failure`).

[Kona: LWG reviewed wording; setstate(failbit) changed to setstate(badbit).]