尝试编译以下代码：
#include <winrt/base.h>
int main() {}
使用以下编译器选项：
/permissive- /std:c++latest
最近发布的 Visual Studio 15.8 Preview 3.0 会导致以下编译错误：
1>------ Build started: Project: test1, Configuration: Debug x64 ------
1>Source.cpp
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(2185): error C3861: 'from_abi': identifier not found
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(2185): note: This diagnostic occurred in the compiler generated function 'conditional<_Test,T,_Ty2>::type winrt::impl::as(From *)'
1> with
1> [
1> _Ty2=winrt::com_ptr<T>
1> ]
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(2209): error C3861: 'from_abi': identifier not found
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(2209): note: This diagnostic occurred in the compiler generated function 'conditional<_Test,T,_Ty2>::type winrt::impl::try_as(From *) noexcept'
1> with
1> [
1> _Ty2=winrt::com_ptr<T>
1> ]
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(3850): error C3861: 'from_abi': identifier not found
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(3873): note: see reference to class template instantiation 'winrt::weak_ref<T>' being compiled
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(2984): note: see reference to class template instantiation 'winrt::com_ptr<ILanguageExceptionErrorInfo2>' being compiled
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(3054): note: see reference to class template instantiation 'winrt::com_ptr<IRestrictedErrorInfo>' being compiled
1>c:\program files (x86)\microsoft visual studio\preview\professional\vc\tools\msvc\14.15.26608\include\type_traits(616): note: see reference to class template instantiation 'std::basic_string_view<wchar_t,std::char_traits<wchar_t>>' being compiled
1>c:\program files (x86)\microsoft visual studio\preview\professional\vc\tools\msvc\14.15.26608\include\xstring(2124): note: see reference to class template instantiation 'std::is_convertible<const _StringViewIsh &,std::basic_string_view<wchar_t,std::char_traits<wchar_t>>>' being compiled
1> with
1> [
1> _StringViewIsh=const wchar_t *
1> ]
1>c:\program files (x86)\microsoft visual studio\preview\professional\vc\tools\msvc\14.15.26608\include\xstring(2122): note: see reference to variable template 'const bool conjunction_v<std::is_convertible<wchar_t const * const &,std::basic_string_view<wchar_t,std::char_traits<wchar_t> > >,std::negation<std::is_convertible<wchar_t const * const &,wchar_t const *> > >' being compiled
1>c:\program files (x86)\microsoft visual studio\preview\professional\vc\tools\msvc\14.15.26608\include\xstring(2281): note: see reference to alias template instantiation '_Is_string_view_ish<const wchar_t*>' being compiled
1>c:\program files (x86)\windows kits\10\include\10.0.17134.0\cppwinrt\winrt\base.h(6308): error C3861: 'to_abi': identifier not found
1>Done building project "test1.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
有什么解决办法吗？
这是一个已知问题，将在未来的 Windows 10 SDK 更新中解决。
您可以通过完全关闭一致性模式来解决这个问题（/permissive-)，-或者- 通过添加到来保持它其他选项 /Zc:twoPhase-禁用两阶段名称查找 https://blogs.msdn.microsoft.com/vcblog/2017/09/11/two-phase-name-lookup-support-comes-to-msvc/.
你应该使用/std:c++17并不是/std:c++latest与 VS 2017 for C++/WinRT 一起启用 C++17，而无需选择加入未来的草案更改。
UPDATE:此问题已使用 Windows 10 October 2018 Update SDK 解决（17763 https://blogs.windows.com/buildingapps/2018/10/02/start-developing-on-windows-10-october-2018-update-today/).
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