Re: [boost] "is-assignable" compile error using Boost 1.68 / LLVM-Clang / Windows

On 20/09/2018 16:47, Adam Hartshorne wrote:

Looks like boost::variant is the problem.

No, those are just plain includes. Nothing to see there.

2>C:\boost_1_68_0\boost/type_traits/has_trivial_move_assign.hpp(49): error : no template named 'is_assignable'; did you mean 'std::is_assignable'? 2>C:\boost_1_68_0\boost/type_traits/intrinsics.hpp(233): note: expanded from macro 'BOOST_HAS_TRIVIAL_MOVE_ASSIGN'

The problem is actually here. As degski suggests, it's probably a compiler detection quirk where the BOOST_HAS_TRIVIAL_MOVE_ASSIGN macro has been defined because __has_feature exists but was not included because __clang doesn't exist. Or something like that. This usually doesn't happen when using MSVC or Clang directly, but since you're using a hybrid the logic is confused.