Visual Studio 2019 - Error C2440 compiling in C++20 mode

[massadop]

Hi, I Am rying the TDP under VS2109, with some the examples. However, it does not compile and give some errors. More in detail, the example I am using is the 05_producers_with_consumers.cpp and the errors I get from the compiler:

Build started...
1>------ Build started: Project: NPXserver, Configuration: Debug Win32 ------
1>NPXserver.cpp
1>C:\P2019\NPXserver\others\tdp\pipeline.impl.hpp(603,53): error C2440: '': cannot convert from 'initializer list' to 'tdp::detail::partial_pipeline<jtc::type_list<>,F,F_>'
1> with
1> [
1> F=main::<lambda_1>
1> ]
1>C:\P2019\NPXserver\others\tdp\pipeline.impl.hpp(605,1): message : No constructor could take the source type, or constructor overload resolution was ambiguous
1>C:\P2019\NPXserver\NPXserver\NPXserver.cpp(75): message : see reference to function template instantiation 'auto tdp::detail::producer<main::<lambda_1>>::operator >><const main::<lambda_2>&>(Fc) noexcept &&' being compiled
1> with
1> [
1> Fc=const main::<lambda_2> &
1> ]
1>C:\P2019\NPXserver\NPXserver\NPXserver.cpp(75,53): error C2677: binary '>>': no global operator found which takes type 'tdp::detail::consumer' (or there is no acceptable conversion)
1>Done building project "NPXserver.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[JoelFilho]

Hello @massadop, and thanks for trying out TDP!

C++20 changed how aggregates work, with P1008, in a non-backwards-compatible way. So it broke the partial_pipeline template, since it was an aggregate with deleted copy/move constructors.

It should be a quick upgrade path, though I'll also need to upgrade testing for the other compilers with C++20 support now. So I'll only be able to guarantee it's working on every platform in the weekend.

Until then, you can try checking out the update from #11. I've tested it on MSVC 2019 and it seems to be working.

[JoelFilho]

I've merged the solution to the main branch, after confirming the new CI setup works.

Thank you again for the contribution!