Supplies non-type argument to mpl::integral_c and breaks in gil/channel_algorithm.hpp:54

[anonymous]

--- k3dsdk/CMakeFiles/k3dsdk.dir/utility_gl.cpp.o ---
In file included from /usr/ports/graphics/k3d/work/k3d-7111d0e/k3dsdk/utility_gl.cpp:37:
In file included from /usr/ports/graphics/k3d/work/k3d-7111d0e/k3dsdk/utility_gl.h:28:
In file included from /usr/ports/graphics/k3d/work/k3d-7111d0e/k3dsdk/bitmap.h:36:
In file included from /usr/local/include/boost/gil/gil_all.hpp:26:
/usr/local/include/boost/gil/channel_algorithm.hpp:54:85: error: non-type template argument evaluates to -1, which cannot be narrowed to type 'unsigned long' [-Wc++11-narrowing]
struct unsigned_integral_max_value : public mpl::integral_c<UnsignedIntegralChannel,-1> {};
                                                                                    ^
/usr/local/include/boost/gil/channel_algorithm.hpp:204:19: note: in instantiation of template class 'boost::gil::detail::unsigned_integral_max_value<unsigned long>' requested here
        if (src > unsigned_integral_max_value<uintmax_t>::value - div2)
                  ^

boost-libs-1.65.1_1 on FreeBSD 11.1

[anonymous]

Substituting -1 with static_cast<UnsignedIntegralChannel>(-1) helps.

The project is K-3D/k3d on github.

[yuri <yuri@…>]

The downstream bug report: ​https://github.com/K-3D/k3d/issues/31

[Mateusz Loskot]

This issue has been fixed in GIL released in Boost 1.68

​https://github.com/boostorg/gil/commit/18eacb424baf69852bb24858e1b3a5c86e1f9033