[PATCH] PR libstdc++/59568 fix error handling for std::complex stream extraction

[Jonathan Wakely]

On 13/12/17 18:42 +0000, Jonathan Wakely wrote:
>The bug here is that we called putback even if the initial __is >> __ch
>extraction failed and set eofbit, and putback clears the eofbit. I
>found a number of other problems though, such as not even trying to
>call putback after failing to find the ',' and ')' characters.
>
>I decided to rewrite the function following the proposed resolution
>for https://wg21.link/lwg2714 which is a much more precise
>specification for much more desirable semantics.
>
>	PR libstdc++/59568
>	* include/std/complex (operator>>): Implement proposed resolution to
>	LWG 2714. Use putback if and only if a character has been successfully
>	extracted but isn't a delimiter. Use ctype::widen and traits::eq when
>	testing if extracted characters match delimiters.
>	* testsuite/26_numerics/complex/dr2714.cc: New test.
>
>Tested powerpc64le-linux, committed to trunk.

Here's a tweak for the testcase. Tested x86_64-linux, committed to trunk.


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