How to build against libvcd https://github.com/edrosten/libcvd ?

[jiapei100]

It looks like current PTAM-GPL is problematic with
/cvd/internal/scalar_convert.h
error: with 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const'

In file included from /usr/local/include/cvd/internal/convert_pixel_types.h:7:0,
from /usr/local/include/cvd/internal/pixel_operations.h:7,
from /usr/local/include/cvd/vision.h:11,
from ....../PTAM/src/CalibCornerPatch.cc:6:
/usr/local/include/cvd/internal/scalar_convert.h:96:24: error: 'constexpr const T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const' cannot be overloaded
constexpr const T& operator[](size_t i) const
^
/usr/local/include/cvd/internal/scalar_convert.h:91:18: error: with 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const'
constexpr T& operator[](size_t i)
^
/usr/local/include/cvd/internal/scalar_convert.h: In instantiation of 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const [with T = float; int N = 512; size_t = long unsigned int]':
/usr/local/include/cvd/internal/scalar_convert.h:107:11: required from 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = float]'
/usr/local/include/cvd/internal/scalar_convert.h:112:88: required from here
/usr/local/include/cvd/internal/scalar_convert.h:93:18: error: binding 'const float' to reference of type 'float&' discards qualifiers
return elems[i];
^
/usr/local/include/cvd/internal/scalar_convert.h:94:5: error: body of constexpr function 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const [with T = float; int N = 512; size_t = long unsigned int]' not a return-statement
}
^
/usr/local/include/cvd/internal/scalar_convert.h: In instantiation of 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = float]':
/usr/local/include/cvd/internal/scalar_convert.h:112:88: required from here
/usr/local/include/cvd/internal/scalar_convert.h:110:4: error: body of constexpr function 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = float]' not a return-statement
}
^
/usr/local/include/cvd/internal/scalar_convert.h:112:88: error: 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = float]' called in a constant expression
constexpr static trivial_array<float, 512> float_for_byte = buildLookupTable();
^
/usr/local/include/cvd/internal/scalar_convert.h:103:36: note: 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = float]' is not usable as a constexpr function because:
constexpr trivial_array<S, 512> buildLookupTable()
^
/usr/local/include/cvd/internal/scalar_convert.h: In instantiation of 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const [with T = double; int N = 512; size_t = long unsigned int]':
/usr/local/include/cvd/internal/scalar_convert.h:107:11: required from 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = double]'
/usr/local/include/cvd/internal/scalar_convert.h:113:91: required from here
/usr/local/include/cvd/internal/scalar_convert.h:93:18: error: binding 'const double' to reference of type 'double&' discards qualifiers
return elems[i];
^
/usr/local/include/cvd/internal/scalar_convert.h:94:5: error: body of constexpr function 'constexpr T& CVD::Pixel::Internal::Internal::trivial_array<T, N>::operator const [with T = double; int N = 512; size_t = long unsigned int]' not a return-statement
}
^
/usr/local/include/cvd/internal/scalar_convert.h: In instantiation of 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = double]':
/usr/local/include/cvd/internal/scalar_convert.h:113:91: required from here
/usr/local/include/cvd/internal/scalar_convert.h:110:4: error: body of constexpr function 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = double]' not a return-statement
}
^
/usr/local/include/cvd/internal/scalar_convert.h:113:91: error: 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = double]' called in a constant expression
constexpr static trivial_array<double, 512> double_for_byte = buildLookupTable();
^
/usr/local/include/cvd/internal/scalar_convert.h:103:36: note: 'constexpr CVD::Pixel::Internal::Internal::trivial_array<S, 512> CVD::Pixel::Internal::Internal::buildLookupTable() [with S = double]' is not usable as a constexpr function because:
constexpr trivial_array<S, 512> buildLookupTable()
^
In file included from /usr/local/include/cvd/vision.h:12:0,
from ....../PTAM/src/CalibCornerPatch.cc:6:
/usr/local/include/cvd/utility.h: In instantiation of 'void CVD::copy(const CVD::BasicImage&, CVD::BasicImage&, CVD::ImageRef, CVD::ImageRef, CVD::ImageRef) [with S = float; T = float]':
....../PTAM/src/CalibCornerPatch.cc:49:79: required from here
/usr/local/include/cvd/utility.h:40:17: error: 'convert_image' was not declared in this scope
convert_image(in, out);
^
PTAM/CMakeFiles/PTAM.dir/build.make:134: recipe for target 'PTAM/CMakeFiles/PTAM.dir/src/CalibCornerPatch.cc.o' failed
make[2]: *** [PTAM/CMakeFiles/PTAM.dir/src/CalibCornerPatch.cc.o] Error 1
make[2]: *** Waiting for unfinished jobs....

Any suggestions?

Cheers
Pei