Compilation error on MSVC 19.36

[valgur]

I'm in the process of adding proxy to Conan Center Index (conan-io/conan-center-index#22362) and a test build of proxy v2.1.0 against a copy of the main.cpp example provided in the repo fails on MSVC 19.36.32532.0:

proxy/proxy.h(622,45): error C3546: '...': there are no parameter packs available to expand
proxy/proxy.h(624,2): message : see reference to class template instantiation 'pro::details::combined_dispatch_prototype<Ds...>' being compiled

Full log:

======== Input profiles ========
Profile host:
[settings]
arch=x86_64
build_type=Release
compiler=msvc
compiler.cppstd=20
compiler.runtime=dynamic
compiler.runtime_type=Release
compiler.version=193
os=Windows

======== Testing the package: Building ========
proxy/2.1.0 (test package): RUN: cmake -G "Visual Studio 17 2022" -DCMAKE_TOOLCHAIN_FILE="C:/J2/w/prod-v2/bsr/cci-b6f0142c/recipes/proxy/all/test_package/build/msvc-193-x86_64-20-release/generators/conan_toolchain.cmake" -DCMAKE_INSTALL_PREFIX="C:/J2/w/prod-v2/bsr/cci-b6f0142c/recipes/proxy/all/test_package" -DCMAKE_POLICY_DEFAULT_CMP0091="NEW" "C:\J2\w\prod-v2\bsr\cci-b6f0142c\recipes\proxy\all\test_package"
-- Using Conan toolchain: C:/J2/w/prod-v2/bsr/cci-b6f0142c/recipes/proxy/all/test_package/build/msvc-193-x86_64-20-release/generators/conan_toolchain.cmake
-- Conan toolchain: C++ Standard 20 with extensions OFF
-- The CXX compiler identification is MSVC 19.36.32532.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.36.32532/bin/Hostx64/x64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: Target declared 'msft_proxy'
-- Configuring done
-- Generating done
-- Build files have been written to: C:/J2/w/prod-v2/bsr/cci-b6f0142c/recipes/proxy/all/test_package/build/msvc-193-x86_64-20-release

proxy/2.1.0 (test package): Running CMake.build()
proxy/2.1.0 (test package): RUN: cmake --build "C:\J2\w\prod-v2\bsr\cci-b6f0142c\recipes\proxy\all\test_package\build\msvc-193-x86_64-20-release" --config Release
MSBuild version 17.6.3+07e294721 for .NET Framework

  Checking Build System
  Building Custom Rule C:/J2/w/prod-v2/bsr/cci-b6f0142c/recipes/proxy/all/test_package/CMakeLists.txt
  test_package.cpp
C:\J2\w\prod-v2\bsr\75336\ccfff\p\proxy5414b57492048\p\include\proxy/proxy.h(622,45): error C3546: '...': there are no parameter packs available to expand [C:\J2\w\prod-v2\bsr\cci-b6f0142c\recipes\proxy\all\test_package\build\msvc-193-x86_64-20-release\test_package.vcxproj]
C:\J2\w\prod-v2\bsr\75336\ccfff\p\proxy5414b57492048\p\include\proxy/proxy.h(624,2): message : see reference to class template instantiation 'pro::details::combined_dispatch_prototype<Ds...>' being compiled [C:\J2\w\prod-v2\bsr\cci-b6f0142c\recipes\proxy\all\test_package\build\msvc-193-x86_64-20-release\test_package.vcxproj]

GCC, Clang and AppleClang built without issues in the CI.

[mingxwa]

Thanks for the information. We have updated the implementation. Please try 2.1.1.