[libc++][ranges] implement std::ranges::zip_transform_view (llvm#79605)

Fixes llvm#104977
Fixes llvm#105035

---------

Co-authored-by: Louis Dionne <[email protected]>
Co-authored-by: A. Jiang <[email protected]>

Author: 3 people

libcxx/docs/ReleaseNotes/22.rst

@@ -38,6 +38,7 @@ What's New in Libc++ 22.0.0?
 Implemented Papers
 ------------------
 
+- P2321R2: ``zip`` (`Github <https://github.com/llvm/llvm-project/issues/105169>`__) (The paper is partially implemented. ``zip_transform_view`` is implemented in this release)
 
 Improvements and New Features
 -----------------------------

libcxx/docs/Status/Cxx23Issues.csv

@@ -170,7 +170,7 @@
 "`LWG3687 <https://wg21.link/LWG3687>`__","``expected<cv void, E>`` move constructor should move","2022-07 (Virtual)","|Complete|","16",""
 "`LWG3692 <https://wg21.link/LWG3692>`__","``zip_view::iterator``'s ``operator<=>`` is overconstrained","2022-07 (Virtual)","|Complete|","20",""
 "`LWG3701 <https://wg21.link/LWG3701>`__","Make ``formatter<remove_cvref_t<const charT[N]>, charT>`` requirement explicit","2022-07 (Virtual)","|Complete|","15",""
-"`LWG3702 <https://wg21.link/LWG3702>`__","Should ``zip_transform_view::iterator`` remove ``operator<``","2022-07 (Virtual)","","",""
+"`LWG3702 <https://wg21.link/LWG3702>`__","Should ``zip_transform_view::iterator`` remove ``operator<``","2022-07 (Virtual)","|Complete|","22",""
 "`LWG3703 <https://wg21.link/LWG3703>`__","Missing requirements for ``expected<T, E>`` requires ``is_void<T>``","2022-07 (Virtual)","|Complete|","16",""
 "`LWG3704 <https://wg21.link/LWG3704>`__","LWG 2059 added overloads that might be ill-formed for sets","2022-07 (Virtual)","","",""
 "`LWG3705 <https://wg21.link/LWG3705>`__","Hashability shouldn't depend on basic_string's allocator","2022-07 (Virtual)","|Complete|","16",""
@@ -222,7 +222,7 @@
 "`LWG3765 <https://wg21.link/LWG3765>`__","``const_sentinel`` should be constrained","2022-11 (Kona)","","",""
 "`LWG3766 <https://wg21.link/LWG3766>`__","``view_interface::cbegin`` is underconstrained","2022-11 (Kona)","","",""
 "`LWG3770 <https://wg21.link/LWG3770>`__","``const_sentinel_t`` is missing","2022-11 (Kona)","","",""
-"`LWG3773 <https://wg21.link/LWG3773>`__","``views::zip_transform`` still requires ``F`` to be ``copy_constructible`` when empty pack","2022-11 (Kona)","","",""
+"`LWG3773 <https://wg21.link/LWG3773>`__","``views::zip_transform`` still requires ``F`` to be ``copy_constructible`` when empty pack","2022-11 (Kona)","|Complete|","22",""
 "`LWG3774 <https://wg21.link/LWG3774>`__","``<flat_set>`` should include ``<compare>``","2022-11 (Kona)","","",""
 "`LWG3775 <https://wg21.link/LWG3775>`__","Broken dependencies in the ``Cpp17Allocator`` requirements","2022-11 (Kona)","","",""
 "`LWG3778 <https://wg21.link/LWG3778>`__","``vector<bool>`` missing exception specifications","2022-11 (Kona)","|Complete|","3.7",""
@@ -234,7 +234,7 @@
 "`LWG3792 <https://wg21.link/LWG3792>`__","``__cpp_lib_constexpr_algorithms`` should also be defined in ``<utility>``","2022-11 (Kona)","|Complete|","16",""
 "`LWG3795 <https://wg21.link/LWG3795>`__","Self-move-assignment of ``std::future`` and ``std::shared_future`` have unimplementable postconditions","2022-11 (Kona)","","",""
 "`LWG3796 <https://wg21.link/LWG3796>`__","``movable-box`` as member should use ``default-initialization`` instead of ``copy-initialization``","2022-11 (Kona)","","",""
-"`LWG3798 <https://wg21.link/LWG3798>`__","Rvalue reference and ``iterator_category``","2022-11 (Kona)","|Partial|","","``join_with_view``, ``zip_transform_view``, and ``adjacent_transform_view`` haven't been done yet since these types aren't implemented yet"
+"`LWG3798 <https://wg21.link/LWG3798>`__","Rvalue reference and ``iterator_category``","2022-11 (Kona)","|Partial|","","``adjacent_transform_view`` hasn't been done yet since this type isn't implemented yet"
 "`LWG3801 <https://wg21.link/LWG3801>`__","``cartesian_product_view::iterator::distance-from`` ignores the size of last underlying range","2022-11 (Kona)","","",""
 "`LWG3814 <https://wg21.link/LWG3814>`__","Add freestanding items requested by NB comments","2022-11 (Kona)","","",""
 "`LWG3816 <https://wg21.link/LWG3816>`__","``flat_map`` and ``flat_multimap`` should impose sequence container requirements","2022-11 (Kona)","","",""

libcxx/include/CMakeLists.txt

@@ -737,6 +737,7 @@ set(files
   __ranges/transform_view.h
   __ranges/view_interface.h
   __ranges/views.h
+  __ranges/zip_transform_view.h
   __ranges/zip_view.h
   __split_buffer
   __std_mbstate_t.h