566. array forms of unformatted input function undefined for zero-element arrays

Section: 30.7.4.3 [istream.unformatted] Status: CD1 Submitter: Martin Sebor Opened: 2006-02-23 Last modified: 2016-02-10

Priority: Not Prioritized

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Discussion:

The array forms of unformatted input functions don't have well-defined semantics for zero-element arrays in a couple of cases. The affected ones (istream::get() and getline()) are supposed to terminate when (n - 1) characters are stored, which obviously can never be true when (n == 0) to start with.

Proposed resolution:

I propose the following changes (references are relative to the Working Draft (document N1804).

Change 27.6.1.3, p8 (istream::get()), bullet 1 as follows:

if (n < 1) is true or (n - 1) characters are stored;

Similarly, change 27.6.1.3, p18 (istream::getline()), bullet 3 as follows:

(n < 1) is true or (n - 1) characters are stored (in which case the function calls setstate(failbit)).

Finally, change p21 as follows:

In any case, provided (n > 0) is true, it then stores a null character (using charT()) into the next successive location of the array.