[libcxx-commits] [libcxx] [libc++][format][3/3] Improves formatting performance. (PR #108990)

[Mark de Wever via libcxx-commits]

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@@ -53,24 +56,147 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace __format {
 
+// A helper to limit the total size of code units written.
+class _LIBCPP_HIDE_FROM_ABI __max_output_size {
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mordante wrote:

We've done that a few times where we want a private struct not be part of the ABI. I've looked with @ldionne at the best way to mark these and we concluded `_LIBCPP_HIDE_FROM_ABI` would work.

https://github.com/llvm/llvm-project/pull/108990