Are there any template trigonometry functions?

[PengYu.UT]

Hi,

I'm wondering if there are any template trigonometry functions in C++.
I used the following code for that purpose. But if the library has it,
it will be better.

Thanks,
Peng

#include <cmath>

template <typename T>
struct arctan2;

template <>
struct arctan2<double{
static double doit(double y, double x) { return atan2(y, x); }
};

template <>
struct arctan2<float{
static float doit(float y, float x) { return atan2f(y, x); }
};

template <>
struct arctan2<double{
static long double doit(long double y, long double x) { return
atan2l(y, x); }
};


Thanks,
Peng

[=?ISO-8859-1?Q?Erik_Wikstr=F6m?=]

On 2007-07-07 16:25, Pe*******@gmail.com wrote:

Hi,

I'm wondering if there are any template trigonometry functions in C++.
I used the following code for that purpose. But if the library has it,
it will be better.

What do you need parametrised versions for when there are overloaded ones?

The standard defines the following for atan2:

float atan2(float, float)
double atan2(double, double)
long double atan2(long double, long double)
--
Erik Wikström

[Kai-Uwe Bux]

Pe*******@gmail.com wrote:

Hi,

I'm wondering if there are any template trigonometry functions in C++.
I used the following code for that purpose. But if the library has it,
it will be better.

Thanks,
Peng

#include <cmath>

template <typename T>
struct arctan2;

template <>
struct arctan2<double{
static double doit(double y, double x) { return atan2(y, x); }
};

template <>
struct arctan2<float{
static float doit(float y, float x) { return atan2f(y, x); }
};

template <>
struct arctan2<double{
static long double doit(long double y, long double x) { return
atan2l(y, x); }
};

In addition to the double-versions, <cmathprovides overloads of the
math-functions for float and long double [26.5/5-6]. Thus, there are
already overloads for atan2 with the following signatures:

float atan2 ( float, float );
double atan2 ( double, double );
long double atan2 ( long double, long double );

Best

Kai-Uwe Bux