todouble() converts two ints, a numerator and a denominator, into a double and returns it. When I try to take the square root of the double, I get the errors below. As hard as it is to believe STLport will only take the square root of a float and a long double. (See _cmath.h, which is included in cmath.) When I cast the return of todouble() to long double it worked.

        std::cout << "Fraction x is " << x << "\tsqrt x is "<<
std::sqrt(x.todouble()) << std::endl;
                                 ^
ftest6.cpp(40) : Error: ambiguous reference to symbol
Had: std::_inline_sqrt(float )
and: std::_inline_sqrt(long double )
frac6WR.cpp:
ftest6.cpp:
--- errorlevel 1

Some of math functions, and sqrt among them, are #define'd in math.h. Defines serve to promote sqrt/sin/cos an other calls to intrinsic calls. But this surely prevents normal usage of STL.

When ported Blitz to DMC++, I used the code below to suppress this errors:
-----------
#include <math.h>
#undef sin
#undef cos
#undef fabs
#undef sqrt

inline double cos (double x) { return _inline_cos(x);}
inline double sin (double x) { return _inline_sin(x);}
inline double fabs (double x) { return _inline_fabs(x);}
inline double sqrt (double x) { return _inline_sqrt(x);}
------------
You should insert it before you make calls to std::sqrt.

Or even simpler solution, write sqrt instead of std::sqrt.

Nic Tiger.

"Jim Jennings" <jwjenn@mindspring.com> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:b57s60$16lp$1@digitaldaemon.com...
> todouble() converts two ints, a numerator and a denominator, into a double and returns it. When I try to take the square root of the double, I get
the
> errors below. As hard as it is to believe STLport will only take the
square
> root of a float and a long double. (See _cmath.h, which is included in
> cmath.) When I cast the return of todouble() to long double it worked.
>
>         std::cout << "Fraction x is " << x << "\tsqrt x is "<<
> std::sqrt(x.todouble()) << std::endl;
>                                  ^
> ftest6.cpp(40) : Error: ambiguous reference to symbol
> Had: std::_inline_sqrt(float )
> and: std::_inline_sqrt(long double )
> frac6WR.cpp:
> ftest6.cpp:
> --- errorlevel 1
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>

Thank you, Nic.
This works. I have filed this away, and will use it in the future.
JIm

"Nic Tiger" <nictiger@progtech.ru> wrote in message news:b588j0$1gpb$1@digitaldaemon.com...
> Some of math functions, and sqrt among them, are #define'd in math.h. Defines serve to promote sqrt/sin/cos an other calls to intrinsic calls.
But
> this surely prevents normal usage of STL.
>
> When ported Blitz to DMC++, I used the code below to suppress this errors:
> -----------
> #include <math.h>
> #undef sin
> #undef cos
> #undef fabs
> #undef sqrt
>
> inline double cos (double x) { return _inline_cos(x);}
> inline double sin (double x) { return _inline_sin(x);}
> inline double fabs (double x) { return _inline_fabs(x);}
> inline double sqrt (double x) { return _inline_sqrt(x);}
> ------------
> You should insert it before you make calls to std::sqrt.
>
> Or even simpler solution, write sqrt instead of std::sqrt.
>
> Nic Tiger.
>