How to make clang-format 11 put a space after variadic template decleration

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I'm not sure what's going on and how to accurately describe it. Here's the source code

template <typename ...Args>
void foo(Args &&...args)
{
    bar(std::forward<Args>(args)...);
}

My friend with clang-format 10 on Ubuntu generated this

template <typename ... Args>
void foo(Args &&... args)
{
    bar(std::forward<Args>(args)...);
}

But my clang-format 11 on Arch with the same .clang-format file generated the following:


template <typename ...Args>
void foo(Args &&...args)
//              ^^^^ Notice the missing space after ...
{
    bar(std::forward<Args>(args)...);
}

I didn't find suspicious changes in clang-fotmat 11's changelog. What am I missing?

clang-format c++
1 Answers

Since I had the same issue, after some git bisecting, I found the commit that introduced this change: https://reviews.llvm.org/D83564

clang-format does not obey PointerAlignment: Right for ellipsis in declarator for pack

The reasoning behind this change is that you can either consider the annotation &&... part of the type (PointerAlignment: Left) or of the variable (PointerAlignment: Right) or if you want, put it in the middle (PointerAlignment: Middle). This change was meant to prevent an inconsistency between having a && and &&... parameter (pack), which would be formatted like this

template <typename Arg, typename ...Args>
void foo(Arg &&arg, Args &&... args)
{
    bar(std::forward<Args>(args)...);
}

with an older clang-format, but like this

template <typename Arg, typename ...Args>
void foo(Arg &&arg, Args &&...args)
{
    bar(std::forward<Args>(args)...);
}

with a more recent one.

user_82171800
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