boost.python incompatible with -std=c++17 with `noexcept` on g++-7 about python

[stefanseefeld]

I can't claim to understand the full issue yet, but from looking at the line in question (invoke.hpp:75) it seems the issue is that the A::do_nothing member pointer isn't recognized as a pointer-to-member. I'll have to play around with g++7 to see why that is, i.e. whether boost's own is_member_function_pointer trait yields the wrong value.
Given that you are already using g++7, perhaps you could do that experiment yourself, and tentatively replace boost::is_member_function_pointer by std::is_member_function_pointer.
(It would be a good idea for Boost.Python in general to substitute all the type traits by standard equivalents, when compiling with a C++-11 compiler.)

[Chengifei]

The error had gone!(by changing boost:: to std::) Thanks a lot for your advice, and for internal structure of boost.python. But still, don't know how that's related to noexcept... Thanks again!

[stefanseefeld]

Great. I'v added a new task to do more of that replacement.
I'm glad to see it was that easy. :-)

[jwakely]

For the record, the problem was due to noexcept being part of the function type in C++17, so traits like is_function need to be enhanced to handle noexcept function types in C++17. Presumably that hadn't been done for the Boost traits.