pointer to function template parameter

[Amadeus W. M.]

Don't laugh/get pissed off if I'm way off here, but is it possible to have
a template parameter a pointer to a function? If it's possible, an example
would be good.

I'm getting tired of implementing functors as wrappers for what should be
simple C functions.

[benben]

"Amadeus W. M." <am*******@cabl espeed.com> wrote in message
news:pa******** *************** *****@cablespee d.com...

Don't laugh/get pissed off if I'm way off here, but is it possible to have
a template parameter a pointer to a function? If it's possible, an example
would be good.

I'm getting tired of implementing functors as wrappers for what should be
simple C functions.

AFAIK a simple C function is a valid functor.

Ben

[Thierry Miceli]

Hello Amadeus W. M.,

Don't laugh/get pissed off if I'm way off here, but is it possible to
have a template parameter a pointer to a function? If it's possible,
an example would be good.

I'm getting tired of implementing functors as wrappers for what should
be simple C functions.

You should be able to pass a pointer to a function where you pass a functor.

example:

template< typename T > void foo( T fun )
{
fun();
}

void bar()
{
}

struct functor
{
void operator()();
};

main()
{
foo(bar); // pass pointer to function
foo(functor()); // pass functor instance
}

[John Harrison]

Amadeus W. M. wrote:

Don't laugh/get pissed off if I'm way off here, but is it possible to have
a template parameter a pointer to a function? If it's possible, an example
would be good.

I'm getting tired of implementing functors as wrappers for what should be
simple C functions.

Is this what you mean?

#include <amth.h>

template <double (*func)(double) >
double wierd_trig(doub le x)
{
return func(x);
}

int main()
{
wierd_trig<sin> (1.0);
wierd_trig<cos> (1.0);
}

Template terminology is confusing, but I believe that is what you asked.

john

[Amadeus W. M.]

On Sat, 03 Sep 2005 05:48:08 +0000, John Harrison wrote:

Amadeus W. M. wrote:

Don't laugh/get pissed off if I'm way off here, but is it possible to have
a template parameter a pointer to a function? If it's possible, an example
would be good.

I'm getting tired of implementing functors as wrappers for what should be
simple C functions.

Is this what you mean?

#include <amth.h>

template <double (*func)(double) >
double wierd_trig(doub le x)
{
return func(x);
}

int main()
{
wierd_trig<sin> (1.0);
wierd_trig<cos> (1.0);
}

Template terminology is confusing, but I believe that is what you asked.

john

That's precisely what I mean, thanks a lot!