clang-format: Allow empty structs and classes on single line

[AdamBucior]

When I format this example code:

struct A
{
  int i;
};

struct B {};

class C
{
  void foo();
};

class D {};

With this .clang-format file:

BraceWrapping:
 AfterClass: true
 AfterStruct: true
 SplitEmptyRecord: false

BreakBeforeBraces: Custom

I get this ugly result:

struct A
{
  int i;
};

struct B
{};

class C
{
  void foo();
};

class D
{};

I would like there to be an option to allow empty structs and classes on a single line (so that the example code is left unchanged) just like it is possible with functions by using AllowShortFunctionsOnASingleLine.

[llvmbot]

@llvm/issue-subscribers-clang-format

[triplejam]

I agree. I want this feature too.

Whenever there is a lot of any sort of template metaprogramming, it's not uncommon for there to be types used simply as some sort of identifier.

[Ahajha]

+1 for this. I've seen a few threads asking for this dating back to at least clang 12, would love to have this.