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copied!<p>First, reading the string "-1" as a negative number is locale dependent (it would be possible for a locale to identify negative numbers by enclosing them in parenthesis). <a href="http://www.research.att.com/~bs/3rd_loc.pdf" rel="nofollow noreferrer">Your default standard is the "classic" C locale</a>:</p> <blockquote> <p>By far the dominant use of <em>locales</em> is implicitly, in stream I/O. Each <em>istream</em> and <em>ostream</em> has its own <em>locale</em>. The <em>locale</em> of a stream is by default the global <em>locale</em> at the time of the stream’s creation (page 6). ...</p> <p>Initially, the global locale is the standard C locale, <em>locale::classic()</em> (page 11).</p> </blockquote> <p><strike>According to the GCC guys, <a href="http://gcc.gnu.org/ml/gcc-prs/2002-01/msg00693.html" rel="nofollow noreferrer">numeric overflow is allowed to fail the stream input operation</a> (talking about negative numbers that overflowed a signed int):</p> <blockquote> <p>[T]he behaviour of libstdc++-v3 is strictly standard conforming. ... When the read is attempted it does <em>not</em> fit in a signed int i, and it fails.</strike></p> </blockquote> <p>Thanks to another answer, <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39802" rel="nofollow noreferrer">a bug was filed and this behavior changed</a>:</p> <blockquote> <p>Oops, apparently we never parsed correctly negative values for unsigned. The fix is simple. ...</p> <p>Fixed in mainline, will be fixed in 4.4.1 too.</p> </blockquote> <p>Second, although integer overflow is generally predictable, I believe it's <a href="http://dobbscodetalk.com/index.php?option=com_myblog&show=A-parable-about-undefined-behavior.html&Itemid=29" rel="nofollow noreferrer">officially undefined behavior</a>, so while I can't say why -32769" converts to 32767, I think it's allowed.</p>

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