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[libc++] Clarify the release note for uncaught_exception removal and deprecation #123118

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Jan 16, 2025
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[libc++] Clarify the release note for uncaught_exception removal and deprecation #123118

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11 changes: 6 additions & 5 deletions libcxx/docs/ReleaseNotes/20.rst
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Expand Up @@ -55,7 +55,8 @@ Improvements and New Features
- The ``_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER`` macro has been added to make ``std::get_temporary_buffer`` and
``std::return_temporary_buffer`` available.

- The ``_LIBCPP_ENABLE_CXX20_REMOVED_UNCAUGHT_EXCEPTION`` macro has been added to make ``std::uncaught_exception``
- The ``std::uncaught_exception`` function was marked as deprecated since C++17 and removed since C++20. The
``_LIBCPP_ENABLE_CXX20_REMOVED_UNCAUGHT_EXCEPTION`` macro has been added to make ``std::uncaught_exception``
available in C++20 and later modes.

- The internal structure ``__compressed_pair`` has been replaced with ``[[no_unique_address]]``, resulting in reduced
Expand All @@ -69,12 +70,12 @@ Improvements and New Features
- The ``_LIBCPP_ABI_BOUNDED_ITERATORS_IN_STD_ARRAY`` ABI configuration was added, which allows storing valid bounds
in ``std::array::iterator`` and detecting OOB accesses when the appropriate hardening mode is enabled.

- The ``input_iterator``-pair overload of ``void assign(InputIt, InputIt)`` has been optimized for ``std::vector``,
resulting in a performance improvement of up to 2x for trivial element types (e.g., ``std::vector<int>``), and up
- The ``input_iterator``-pair overload of ``void assign(InputIt, InputIt)`` has been optimized for ``std::vector``,
resulting in a performance improvement of up to 2x for trivial element types (e.g., ``std::vector<int>``), and up
to 3.4x for non-trivial element types (e.g., ``std::vector<std::vector<int>>``).

- The ``input_iterator``-pair overload of ``iterator insert(const_iterator, InputIt, InputIt)`` has been optimized
for ``std::vector``, resulting in a performance improvement of up to 10x for ``std::vector<int>``, and up to 2.3x
- The ``input_iterator``-pair overload of ``iterator insert(const_iterator, InputIt, InputIt)`` has been optimized
for ``std::vector``, resulting in a performance improvement of up to 10x for ``std::vector<int>``, and up to 2.3x
for ``std::vector<std::vector<int>>``.

- On Windows, ``<system_error>``'s ``std::system_category`` is now distinct from ``std::generic_category``. The behavior
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