[Bug libstdc++/12065] Strange fpos arithmetic.

[peturr02 at ru dot is]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12065



------- Additional Comments From peturr02 at ru dot is  2003-08-26 13:26 -------
Created an attachment (id=4653)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=4653&action=view)
Test case

Here is the output I get from running this program:

typeid(p) = std::fpos<__mbstate_t>
typeid(q) = std::fpos<__mbstate_t>
typeid(o) = l
typeid(p + o) = std::fpos<__mbstate_t>
typeid(q + o) = l
typeid(p - o) = std::fpos<__mbstate_t>
typeid(q - o) = l
typeid(p - q) = std::fpos<__mbstate_t>
typeid(q - p) = l

Note how the type of the result changes depending on only the constness of
the arguments.