[Boost-users] [Gil] Unknown compilation error (VS10)

Subject: [Boost-users] [Gil] Unknown compilation error (VS10)
From: Sapp, Mark (Mark.Sapp_at_[hidden])
Date: 2011-11-07 13:12:57

Hi all,

I have encountered a compilation error in Visual Studio 2010 that I can't find any information online about. The error is:

        error C2338: (is_same<typename Layout::color_space_t, gray_t>::value)

It occurs when I call transform_pixels (..) on image views that are not grayscale. Below is example code that reproduces the error and I have attached the build output. If you comment out the first absolute difference call, the program compiles as expected. Also, if it helps, I was able to get similar code working intermittently by commenting the line and rebuilding, then un-commenting and building (not rebuilding). That made me think it may be something related to the template definitions during compile time and the previous build results effecting something.

#include "stdafx.h"
#include <boost/gil/image.hpp>
#include <boost/gil/typedefs.hpp>

using namespace boost::gil;

template <typename Out>
struct op_absoluteDifference {
        template <typename T> Out operator()(const T& in1, const T& in2) const {
                return Out(abs(in2-in1));
        }
};

template <typename SrcView1, typename SrcView2, typename DstView>
void absoluteDifference(const SrcView1& src1, const SrcView2& src2, const DstView& dst)
{
        typedef typename channel_type<DstView>::type dst_channel_t;
        transform_pixels(src1, src2, dst, op_absoluteDifference<dst_channel_t>());
}

int _tmain(int argc, _TCHAR* argv[])
{
        rgb8_image_t img1(100,100);
        fill_pixels(view(img1), rgb8_pixel_t(0,0,0));
        rgb8_image_t img2(100,100);
        fill_pixels(view(img2), rgb8_pixel_t(10,20,30));
        rgb8_image_t img3(100,100);
            fill_pixels(view(img3), rgb8_pixel_t(0,0,0));
        absoluteDifference(const_view(img1), const_view(img2), view(img3));   //causes compilation error C2338: (is_same<typename Layout::color_space_t, gray_t>::value)
        gray16_image_t img4(100,100);
        fill_pixels(view(img4), gray16_pixel_t(0));
        gray16_image_t img5(100,100);
        fill_pixels(view(img5), gray16_pixel_t(10));
        gray16_image_t img6(100,100);
        fill_pixels(view(img6), gray16_pixel_t(0));
        absoluteDifference(const_view(img4), const_view(img5), view(img6));
        return 0;
}

I'm very new to the library so I wouldn't be surprised if I was doing something incorrectly. I appreciate any help or guidance.

Thank you for your time,
Mark

Mark Sapp
Aeroflex
O: 512-327-4401 x278
F:  512-327-3341
mark.sapp_at_[hidden]
www.aeroflex.com

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