[libc++][ranges] P2164R9: Implements `views::enumerate` #73617

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Merged

ldionne merged 131 commits into llvm:main from H-G-Hristov:hgh/libcxx/P2164R9-ranges-enumerate_view

Apr 22, 2026

libcxx/docs/FeatureTestMacroTable.rst

-Original file line number
+Diff line change
@@ Expand Up / @@ -376,6 +376,8 @@ Status @@
         ---------------------------------------------------------- -----------------
         ``__cpp_lib_ranges_contains``                              ``202207L``
         ---------------------------------------------------------- -----------------
+        ``__cpp_lib_ranges_enumerate``                             ``202302L``
+        ---------------------------------------------------------- -----------------
         ``__cpp_lib_ranges_find_last``                             ``202207L``
         ---------------------------------------------------------- -----------------
         ``__cpp_lib_ranges_iota``                                  ``202202L``
@@ Expand Down @@

libcxx/docs/ReleaseNotes/23.rst

-Original file line number
+Diff line change
@@ Expand Up / @@ -44,6 +44,7 @@ Implemented Papers @@
     - P4052R0: Renaming saturation arithmetic functions (`Github <https://llvm.org/PR189589>`__)
     - P2781R9: ``std::constant_wrapper`` (`Github <https://llvm.org/PR148179>`__)
     - P3978R3: ``constant_wrapper`` should unwrap on call and subscript (`Github <https://llvm.org/PR189605>`__)
+    - P2164R9: ``views::enumerate`` (`Github <https://llvm.org/PR105251>`__)
     Improvements and New Features
     -----------------------------
@@ Expand Down @@

libcxx/docs/Status/Cxx23Papers.csv

-Original file line number
+Diff line change
@@ Expand Up / @@ -104,7 +104,7 @@ @@
     "","","","","","",""
     "`P0290R4 <https://wg21.link/P0290R4>`__","``apply()`` for ``synchronized_value<T>``","2023-02 (Issaquah)","","","`#105249 <https://github.com/llvm/llvm-project/issues/105249>`__",""
     "`P2770R0 <https://wg21.link/P2770R0>`__","Stashing stashing ``iterators`` for proper flattening","2023-02 (Issaquah)","|Complete|","21","`#105250 <https://github.com/llvm/llvm-project/issues/105250>`__",""
-    "`P2164R9 <https://wg21.link/P2164R9>`__","``views::enumerate``","2023-02 (Issaquah)","","","`#105251 <https://github.com/llvm/llvm-project/issues/105251>`__",""
+    "`P2164R9 <https://wg21.link/P2164R9>`__","``views::enumerate``","2023-02 (Issaquah)","|Complete|","23","`#105251 <https://github.com/llvm/llvm-project/issues/105251>`__",""
     "`P2711R1 <https://wg21.link/P2711R1>`__","Making multi-param constructors of ``views`` ``explicit``","2023-02 (Issaquah)","|Complete|","21","`#105252 <https://github.com/llvm/llvm-project/issues/105252>`__",""
     "`P2609R3 <https://wg21.link/P2609R3>`__","Relaxing Ranges Just A Smidge","2023-02 (Issaquah)","|Complete|","20","`#105253 <https://github.com/llvm/llvm-project/issues/105253>`__","Implemented as a DR in C++20. Other implementations will do the same."
     "`P2713R1 <https://wg21.link/P2713R1>`__","Escaping improvements in ``std::format``","2023-02 (Issaquah)","|Complete|","19","`#105254 <https://github.com/llvm/llvm-project/issues/105254>`__",""
@@ Expand Down @@

libcxx/docs/Status/Cxx2cIssues.csv

            
                      Original file line number
                      Diff line number
                      Diff line change
                  
    @@ -8,8 +8,8 @@
  
    "`LWG3903 <https://wg21.link/LWG3903>`__","span destructor is redundantly noexcept","2023-06 (Varna)","|Complete|","7","`#105275 <https://github.com/llvm/llvm-project/issues/105275>`__",""

    "`LWG3904 <https://wg21.link/LWG3904>`__","``lazy_split_view::outer-iterator``'s const-converting constructor isn't setting ``trailing_empty_``","2023-06 (Varna)","","","`#105276 <https://github.com/llvm/llvm-project/issues/105276>`__",""

    "`LWG3905 <https://wg21.link/LWG3905>`__","Type of ``std::fexcept_t``","2023-06 (Varna)","|Complete|","3.4","`#105277 <https://github.com/llvm/llvm-project/issues/105277>`__",""

    "`LWG3912 <https://wg21.link/LWG3912>`__","``enumerate_view::iterator::operator-`` should be ``noexcept``","2023-06 (Varna)","","","`#105279 <https://github.com/llvm/llvm-project/issues/105279>`__",""

    "`LWG3914 <https://wg21.link/LWG3914>`__","Inconsistent template-head of ``ranges::enumerate_view``","2023-06 (Varna)","","","`#105280 <https://github.com/llvm/llvm-project/issues/105280>`__",""

    "`LWG3912 <https://wg21.link/LWG3912>`__","``enumerate_view::iterator::operator-`` should be ``noexcept``","2023-06 (Varna)","|Complete|","23","`#105279 <https://github.com/llvm/llvm-project/issues/105279>`__",""

    "`LWG3914 <https://wg21.link/LWG3914>`__","Inconsistent template-head of ``ranges::enumerate_view``","2023-06 (Varna)","|Complete|","23","`#105280 <https://github.com/llvm/llvm-project/issues/105280>`__",""

    "`LWG3915 <https://wg21.link/LWG3915>`__","Redundant paragraph about expression variations","2023-06 (Varna)","","","`#105281 <https://github.com/llvm/llvm-project/issues/105281>`__",""

    "`LWG3925 <https://wg21.link/LWG3925>`__","Concept ``formattable``'s definition is incorrect","2023-06 (Varna)","|Complete|","17","`#105282 <https://github.com/llvm/llvm-project/issues/105282>`__",""

    "`LWG3927 <https://wg21.link/LWG3927>`__","Unclear preconditions for ``operator[]`` for sequence containers","2023-06 (Varna)","|Nothing To Do|","","`#105283 <https://github.com/llvm/llvm-project/issues/105283>`__",""

    @@ -41,7 +41,7 @@
  
    "`LWG4001 <https://wg21.link/LWG4001>`__","``iota_view`` should provide ``empty``","2023-11 (Kona)","|Complete|","19","`#105311 <https://github.com/llvm/llvm-project/issues/105311>`__",""

    "","","","","","",""

    "`LWG3767 <https://wg21.link/LWG3767>`__","``codecvt<charN_t, char8_t, mbstate_t>`` incorrectly added to locale","2024-03 (Tokyo)","","","`#105313 <https://github.com/llvm/llvm-project/issues/105313>`__",""

    "`LWG3919 <https://wg21.link/LWG3919>`__","``enumerate_view`` may invoke UB for sized common non-forward underlying ranges","2024-03 (Tokyo)","","","`#105315 <https://github.com/llvm/llvm-project/issues/105315>`__",""

    "`LWG3919 <https://wg21.link/LWG3919>`__","``enumerate_view`` may invoke UB for sized common non-forward underlying ranges","2024-03 (Tokyo)","|Complete|","23","`#105315 <https://github.com/llvm/llvm-project/issues/105315>`__",""

    "`LWG3950 <https://wg21.link/LWG3950>`__","``std::basic_string_view`` comparison operators are overspecified","2024-03 (Tokyo)","|Complete|","18","`#105316 <https://github.com/llvm/llvm-project/issues/105316>`__",""

    "`LWG3975 <https://wg21.link/LWG3975>`__","Specializations of ``basic_format_context`` should not be permitted","2024-03 (Tokyo)","|Nothing To Do|","","`#105317 <https://github.com/llvm/llvm-project/issues/105317>`__",""

    "`LWG3984 <https://wg21.link/LWG3984>`__","``ranges::to``'s recursion branch may be ill-formed","2024-03 (Tokyo)","|Complete|","19","`#105318 <https://github.com/llvm/llvm-project/issues/105318>`__",""

libcxx/include/CMakeLists.txt

-Original file line number
+Diff line change
@@ Expand Up / @@ -731,6 +731,7 @@ set(files @@
       __ranges/empty_view.h
       __ranges/enable_borrowed_range.h
       __ranges/enable_view.h
+      __ranges/enumerate_view.h
       __ranges/filter_view.h
       __ranges/from_range.h
       __ranges/iota_view.h
@@ Expand Down @@

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[libc++][ranges] P2164R9: Implements `views::enumerate` #73617

[libc++][ranges] P2164R9: Implements `views::enumerate` #73617