C++ has a standard function isinf()? like isnan()?
If yes, it returns true in case of +inf and -inf also?
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Jump to Postisnan() is from C99; and is not part of C++98. See http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.15
In C++0x, isnan() is part of TR1.You could easily roll out isnan() and isinf() on your own, though:
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