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scanlne_reader for istream not worked #578
Description
Actual behavior
Code not compiles on msvc 16.9.1
see piece of build log below
1> d:\libraries\boost_1_75_0\boost\gil\io\get_reader.hpp(160,62): error C2039: 'type': is not a member of 'boost::gil::get_read_device<T,FormatTag,void>'
1> with
1> [
1> T=std::ifstream,
1> FormatTag=boost::gil::image_read_settings<boost::gil::jpeg_tag>
1> ]
1> d:\libraries\boost_1_75_0\boost\gil\io\get_reader.hpp(160): message : see declaration of 'boost::gil::get_read_device<T,FormatTag,void>'
1> with
1> [
1> T=std::ifstream,
1> FormatTag=boost::gil::image_read_settings<boost::gil::jpeg_tag>
1> ]
1> d:\libraries\boost_1_75_0\boost\gil\io\make_scanline_reader.hpp(95): message : see reference to class template instantiation 'boost::gil::get_scanline_reader<Device,boost::gil::image_read_settings<boost::gil::jpeg_tag>>' being compiled
1> with
1> [
1> Device=std::ifstream
1> ]
Expected behavior
I want use gil for read jpeg line by line from istream
C++ Minimal Example
#include <fstream>
#include <boost/gil.hpp>
#include <boost/gil/extension/io/jpeg.hpp>
namespace gil = boost::gil;
int main
{
using tag_t = gil::jpeg_tag;
using reader_t = gil::scanline_reader<typename gil::get_read_device<std::istream, tag_t>::type, tag_t>;
std::ifstream is("d:/test.jpg", std::ios::binary | std::ios::in);
reader_t reader = gil::make_scanline_reader(is, tag_t()); //Here an error
}Environment
Inside make_scanline_reader.hpp (line 84) - it seems function recursive:
template <typename Device, typename FormatTag>
inline
auto make_scanline_reader(Device& io_dev, FormatTag const&,
typename std::enable_if
<
mp11::mp_and
<
detail::is_adaptable_input_device<FormatTag, Device>,
is_format_tag<FormatTag>
>::value
>::type* /*dummy*/ = nullptr)
-> typename get_scanline_reader<Device, FormatTag>::type
{
return make_scanline_reader(io_dev, image_read_settings<FormatTag>());
}
- Compiler version: msvc 16.9.1
- Build settings: windows, 64bit
- boost 1.75
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