which compiler is right (either to compile or to barf)...

[LIU Hao]

在 2022/12/1 12:51, leon zadorin via Gcc-help 写道:
> Hi everyone,
> 
> I would be interested to hear the opinions of C++ standard experts on which
> compiler is correctly dealing with the below code (GCC 12.2 -std=c++20
>   compiles fine, MSVC19.33 /std:c++20 compiles fine, Clang 15.0.0 -std=c++20
> barfs)
> 

I think this is a bug in Clang. Instantiation of `shared_ptr<T<U>>` is not meant to instantiate 
`T<U>`. Your code actually compiles fine if the definition of `J` was not provided.

-- 
Best regards,
LIU Hao

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