filebuf.in_avail

[Anthony Williams]

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For an empty file, filebuf.in_avail() returns -1, which is checked
for in the test suite.

However, I wonder whether this is in fact compliant. Surely it makes
no sense to be able to retrieve -1 characters without error? Isn't
zero a far more sensible value?
It certainly wouldn't be in violation of the standard for an
implementation to return zero, so this ought to be permitted in the
testsuite.

Anthony

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