[libcxx-dev] Why does std::allocator<T>::allocate throw std::length_error?

[Mikhail Maltsev via libcxx-dev]

Hi,

I noticed that for some reason in libc++ the function
std::allocator<T>::allocate throws std::length_error when the allocation size
exceeds the maximum size, wheres the C++ standard [allocator.members] requires
to throw std::bad_alloc or std::bad_­array_­new_­length depending on the version
of the standard.

AFAICT this deviation from the standard was introduced intentionally in the
following commit:

commit 4524d6e73953322eafee72aba62ddebef8f7c5cd
Author: Eric Fiselier <eric at efcs.ca>
Date:   Sat May 7 03:12:24 2016 +0000

    Change allocator<T>::allocate to throw length_error, not bad_alloc

    llvm-svn: 268842

What is the rationale behind this change?

--
Regards,
  Mikhail Maltsev