[libcxx-commits] [libcxx] [libc++] Add __pointer_int_pair (PR #94324)

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huixie90 wrote:

Out of interest, how is this useful in the implementation of move_only_function ? I was thinking of

union {
   void* heap_callable_,
   alignas(void*) unsigned char buffer_[N]
   }
   
const vtable* vtable_

Where vtable contains
call
move
Destroy

We don’t seem to need a bool because the vtable function implementation should deal with question whether or not the object is in the buffer or in the heap


https://github.com/llvm/llvm-project/pull/94324