On Mon, Mar 31, 2003 at 02:46:05PM +0800, Ying-Chieh Liao wrote:
> the following code snippet works fine with gcc 2.95.4 on RELENG_4
> but failed on my -current
>
> <code>
> #include <iostream>
> #include <cmath>
>
> using namespace std;
>
> int main(void)
> {
> cout << isnan(1.0) << endl;
> return 0;
> }
> </code>
>
> <err>
> test.cpp: In function `int main()':
> test.cpp:8: `isnan' undeclared (first use this function)
> test.cpp:8: (Each undeclared identifier is reported only once for each function
> it appears in.)
> </err>
>
> what's wrong with my system ? or what can I do for it ?
The isnan() macro is a new feature of C99 and thus not (yet) part of
C++. Nevertheless you can use -D_GLIBCPP_USE_C99 to include this and
some other non-standard C++ features.
Regards,
Stefan Farfeleder
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