Thread: Type/value mismatch while passing type as parameter to function

Inside a function x_gradient(), I declare a type dst_channel_t like so:

Code:

typedef typename channel_type<DstView>::type dst_channel_t;

I'm trying to pass this type as a parameter to a another function (x_gradient_par()) which runs in a thread like so:

Code:

mythreads[i] = std::thread(&x_gradient_par<const SrcView&, const DstView&>, src, dst, dst_channel_t, start, end);

This is what function x_gradient_par() looks like:

Code:

template <typename SrcView, typename DstView>
void x_gradient_par(const SrcView& src, const DstView& dst, const typename channel_type<DstView>::type dst_channel_t, int start, int end) {
    //typedef typename channel_type<DstView>::type dst_channel_t; //I was previously trying to define the type here, but it would always generate an 'invalid use of incomplete type..' error.

    for (int y = start; y < end; ++y)
    {
        typename SrcView::x_iterator src_it = src.row_begin(y);
        typename DstView::x_iterator dst_it = dst.row_begin(y);

        for (int x = 1; x < src.width() - 1; ++x)
        {
            static_transform(src_it[x - 1], src_it[x + 1], dst_it[x],
                             halfdiff_cast_channels<dst_channel_t>());
        }
    }
}

Any hints?

I've attached both the header file and a log file that contains the errors being produced.

x_gradient_par.h
log.txt

No difference. I actually don't think there would be anything wrong with the includes since this is an assignment and that part at least was provided by the lecturer.

It turns out I needed to state the type when calling the function and I wan't doing that. What I was doing was attempt to pass a type as a parameter to the function.
Here's what changed:

When calling the function, I state all types used in the template and no longer pass the type dst_channel_t as a parameter.

Code:

mythreads[i] = std::thread(&x_gradient_par<const SrcView&, const DstView&, const dst_channel_t&>, src, dst, start, end);

Similarly with the function declaration.

Code:

template <typename SrcView, typename DstView, typename dst_channel_t> 
void x_gradient_par(const SrcView& src, const DstView& dst, int start, int end) 
{
    ...
}