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2675. register_callback can fail

Section: [ios.base.callback] Status: New Submitter: David Krauss Opened: 2016-03-14 Last modified: 2019-06-15

Priority: 3

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register_callback allocates memory and so it can fail, but the case is unspecified. libc++ sets badbit, which is consistent with iword and pword. libstdc++ throws std::bad_alloc.

[2019-06-13; Billy comments]

Just as an additional data point: MSVC++ agrees with libstdc++ and also throws std::bad_alloc.

Proposed resolution: