C++20 Idioms for Parameter Packs

Re:C++20 Idioms for Parameter Packs by nix0n on Tuesday February 27, 2024 @10:55AM (#39525545)

This is why the C preprocessor is superior to templates: gcc's "-E" option will show you the preprocessed source file. (I think clang also?)

My personal theory is that compiler authors have not provided a template equivalent, because they are embarrassed about the code that's being produced.

(If you disagree, prove me wrong!)

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Re:C++20 Idioms for Parameter Packs by planede on Tuesday February 27, 2024 @12:06PM (#39526493)

cppinsights.io shows expanded function templates as explicit specializations. It's built on LLVM, but I don't think that this tool is upstreamed.

https://cppinsights.io/lnk?code=dm9pZCBmb28oYXV0bykge30KCnZv...

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Re:C++20 Idioms for Parameter Packs by nix0n on Tuesday February 27, 2024 @12:22PM (#39526694)

Thank you! This is exactly the sort of thing I was looking for.

I found the source at https://github.com/andreasfertig/cppinsights

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Re:C++20 Idioms for Parameter Packs by gpderetta on Tuesday February 27, 2024 @11:05AM (#39525699)

> prove me wrong

Template don't "produce code". They get expanded well after parsing. There is no code to be embarrassed for.

Also you can ask GCC to dump any intermediate state: https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html.

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Re:C++20 Idioms for Parameter Packs by nix0n on Tuesday February 27, 2024 @11:26AM (#39525971)

Is there a specific "-fdump" that you recommend?

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