[libc++][ranges] P2542R8: Implement views::concat

libcxx/docs/FeatureTestMacroTable.rst

@@ -486,7 +486,7 @@ Status
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_philox_engine``                                *unimplemented*
     ---------------------------------------------------------- -----------------
-    ``__cpp_lib_ranges_concat``                                *unimplemented*
+    ``__cpp_lib_ranges_concat``                                ``202403L``
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_ratio``                                        ``202306L``
     ---------------------------------------------------------- -----------------

libcxx/docs/ReleaseNotes/22.rst

@@ -38,6 +38,7 @@ What's New in Libc++ 22.0.0?
 Implemented Papers
 ------------------
 
+- P2542R8: ``views::concat`` (`Github <https://llvm.org/PR105419>`__)
 - P2321R2: ``zip`` (`Github <https://llvm.org/PR105169>`__) (The paper is partially implemented. ``zip_transform_view``
   is implemented in this release)
 - P3168R2: Give ``std::optional`` Range Support (`Github <https://llvm.org/PR105430>`__)

libcxx/docs/Status/Cxx2cPapers.csv

@@ -54,7 +54,7 @@
 "`P3142R0 <https://wg21.link/P3142R0>`__","Printing Blank Lines with ``println``","2024-03 (Tokyo)","|Complete|","19","`#105415 <https://github.com/llvm/llvm-project/issues/105415>`__","Implemented as a DR against C++23. (MSVC STL and libstdc++ will do the same.)"
 "`P2845R8 <https://wg21.link/P2845R8>`__","Formatting of ``std::filesystem::path``","2024-03 (Tokyo)","","","`#105416 <https://github.com/llvm/llvm-project/issues/105416>`__",""
 "`P0493R5 <https://wg21.link/P0493R5>`__","Atomic minimum/maximum","2024-03 (Tokyo)","","","`#105418 <https://github.com/llvm/llvm-project/issues/105418>`__",""
-"`P2542R8 <https://wg21.link/P2542R8>`__","``views::concat``","2024-03 (Tokyo)","","","`#105419 <https://github.com/llvm/llvm-project/issues/105419>`__",""
+"`P2542R8 <https://wg21.link/P2542R8>`__","``views::concat``","2024-03 (Tokyo)","|Complete|","22","`#105419 <https://github.com/llvm/llvm-project/issues/105419>`__",""
 "`P2591R5 <https://wg21.link/P2591R5>`__","Concatenation of strings and string views","2024-03 (Tokyo)","|Complete|","19","`#105420 <https://github.com/llvm/llvm-project/issues/105420>`__",""
 "`P2248R8 <https://wg21.link/P2248R8>`__","Enabling list-initialization for algorithms","2024-03 (Tokyo)","","","`#105421 <https://github.com/llvm/llvm-project/issues/105421>`__",""
 "`P2810R4 <https://wg21.link/P2810R4>`__","``is_debugger_present`` ``is_replaceable``","2024-03 (Tokyo)","","","`#105422 <https://github.com/llvm/llvm-project/issues/105422>`__",""

libcxx/include/CMakeLists.txt

@@ -699,6 +699,7 @@ set(files
   __ranges/as_rvalue_view.h
   __ranges/chunk_by_view.h
   __ranges/common_view.h
+  __ranges/concat_view.h
   __ranges/concepts.h
   __ranges/container_compatible_range.h
   __ranges/counted.h
@@ -735,6 +736,7 @@ set(files
   __ranges/take_while_view.h
   __ranges/to.h
   __ranges/transform_view.h
+  __ranges/tuple_helpers.h
   __ranges/view_interface.h
   __ranges/views.h
   __ranges/zip_transform_view.h