Why is D's GC slower than GO's?

[Walter Bright]

On 10/29/2022 7:14 PM, 12345swordy wrote:
> C++/CLI is used manually to create a gateway to the .net framework from c++ and 
> back. That and the fact the implementation is windows only so that greatly 
> hinders the adoption of the language.

I do understand that. But if it was a winner, why have none of the other C++ 
compilers adopted it? Why isn't in the C++ Standard? Why isn't it in the C Standard?