Re: [Boost-users] GIL: New file io, almost there, but can't compile 'write_view'

Subject: Re: [Boost-users] GIL: New file io, almost there, but can't compile 'write_view'
From: Mateusz Loskot (mateusz_at_[hidden])
Date: 2018-12-08 10:34:35

On Sat, 8 Dec 2018 at 02:46, Dan Bloomquist via Boost-users
<boost-users_at_[hidden]> wrote:
>
> I get to my code, in case it matters:
>          bg::rgb8_image_t destImg( res, x );
>          resize_view( view( sourceImg ), view( destImg ),
> bg::bilinear_sampler( ) );
>
> and rgb8_image_t should be a good one from what I read:
> <https://www.boost.org/doc/libs/1_68_0/libs/gil/doc/html/io.html>

At glance, the docs look fine.

> With either:
>          bg::write_view( path_to, destImg, bg::jpeg_tag() );
> or:
>          bg::image_write_info<bg::jpeg_tag> write_setttings;
>          bg::write_view( path_to, destImg, write_setttings );
>
> ms140 complains:
> 1>C:\cpp\boost_1_68_0\boost/gil/extension/toolbox/metafunctions/get_pixel_type.hpp(33):
> error C2039: 'reference': is not a member of
> 'boost::gil::image<boost::gil::rgb8_pixel_t,false,std::allocator<unsigned
> char>>'
> 1>  c:\cpp\boost_1_68_0\boost\gil\typedefs.hpp(176): note: see
> declaration of
> 'boost::gil::image<boost::gil::rgb8_pixel_t,false,std::allocator<unsigned
> char>>'
> 1>  console_test.cpp(248): note: see reference to class template
> instantiation 'boost::gil::get_pixel_type<boost::gil::rgb8_image_t>'
> being compiled
> 1>C:\cpp\boost_1_68_0\boost/gil/extension/toolbox/metafunctions/get_pixel_type.hpp(34):
> error C2146: syntax error: missing '>' before identifier 'reference'
>
> What am I missing?

I suspect, you are missing some headers.

I have just updated GIL example resize.cpp to catch it up with the new GIL IO
https://github.com/boostorg/gil/commit/531e671b4919420af029568e8e33ffb2baa47c2b

I verified it compiles without errors using Visual Studio 2017 15.9.3
Preview 1.0
(FYI, I configured x64 build with Ninja using the CMake configuration
provided and
https://github.com/boostorg/gil/blob/develop/example/cmake/CMakeSettings.json)

Please, git pull and git checkout develop branch, and try out the example
if it compiles for you as well. I hope it does.
If it does, compare your program against it to see what is different/missing.

p.s. FYI, if you prefer, there is also
https://lists.boost.org/mailman/listinfo.cgi/boost-gil

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net