explanation regarding Template arguments

hi
i have a working code which uses templates.But the number of template arguments mismatch with the call to template object. please explain the code below.

In the below statement one argument is passed to vmmul(ie,<0> ).

Code:

 // Perform element-wise multiply for each pulse.
	tmp = vmmul<0>(replica, tmp);

but in the actual template definition the number of template arguments vary.The vmmul template definition is below.

Code:

template <dimension_type Dim,
typename T0,
typename T1,
typename Block0,
typename Block1>
typename vsip::impl::Vmmul_traits<Dim, T0, T1, Block0, Block1>::view_type
vmmul(
		const_Vector<T0, Block0> v,
		const_Matrix<T1, Block1> m)
VSIP_NOTHROW
{
	typedef impl::Vmmul_traits<Dim, T0, T1, Block0, Block1> traits;
	typedef typename traits::block_type block_type;
	typedef typename traits::view_type view_type;

	return view_type(block_type(v.block(), m.block()));
}

Well obviously, unless the function has been specialized somewhere else, you will need to supply 6 template arguments to the function...

Apparently, everything else can be deduced from what you passed into the function.

With template functions you don't need to specify all the types between <> if the rest of them can be deduced by the compiler.

Anon's right, of course. I should know better than to post before I've had my coffee.

Thanks for reply
But there is no default values specified at the template arguments

Originally Posted by babu198649

Thanks for reply
But there is no default values specified at the template arguments

No, but the compiler "can figure out" what those values should be from what you have passed. Don't ask me how that works, but that's what happens.

--
Mats

Is it compulsary to provide atleast one template argument.(Because without any template arguments i get error).
Also without creating the object arguments are passed to the constructor,how could that happen.

Originally Posted by babu198649

Is it compulsary to provide atleast one template argument.(Because without any template arguments i get error).
Also without creating the object arguments are passed to the constructor,how could that happen.

It can only deduce the template arguments from the function arguments. Since "Dim" isn't used in the function arguments, you must specify it explicitly.

What you send to the constructor of the arguments passed as parameters v and m has no bearing on the function.

Thank u king mir,
That solved all my doubts(I was thiniking too much about class templates ,that i forgot to see that vmmul is actually a function template).