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[libc++][docs] Confirm that P3136R1 Retiring niebloids is Complete #135932

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May 7, 2025
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[libc++][docs] Confirm that P3136R1 Retiring niebloids is Complete #135932

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e375ab7
[libc++][docs] Confirm that P3136R1 is Nothing To Do
frederick-vs-ja Apr 16, 2025
b8dd9e2
P3136R1 was essentially implemented in LLVM 14
frederick-vs-ja Apr 27, 2025
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2 changes: 1 addition & 1 deletion libcxx/docs/Status/Cxx2cPapers.csv
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Expand Up @@ -76,7 +76,7 @@
"`P2422R1 <https://wg21.link/P2422R1>`__","Remove ``nodiscard`` annotations from the standard library specification","2024-06 (St. Louis)","|Complete|","19","``nodiscard`` attributes were kept as a conforming extension"
"`P2300R10 <https://wg21.link/P2300R10>`__","``std::execution``","2024-06 (St. Louis)","","",""
"","","","","",""
"`P3136R1 <https://wg21.link/P3136R1>`__","Retiring niebloids","2024-11 (Wrocław)","","",""
"`P3136R1 <https://wg21.link/P3136R1>`__","Retiring niebloids","2024-11 (Wrocław)","|Nothing To Do|","","libc++ has been implementing niebloids as customization point objects since they are initially added."
"`P3138R5 <https://wg21.link/P3138R5>`__","``views::cache_latest``","2024-11 (Wrocław)","","",""
"`P3379R0 <https://wg21.link/P3379R0>`__","Constrain ``std::expected`` equality operators","2024-11 (Wrocław)","","",""
"`P2862R1 <https://wg21.link/P2862R1>`__","``text_encoding::name()`` should never return null values","2024-11 (Wrocław)","","",""
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2 changes: 1 addition & 1 deletion libcxx/test/std/algorithms/ranges_robust_against_omitting_invoke.pass.cpp
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Expand Up @@ -35,7 +35,7 @@ struct Bar {
Bar create() const { return Bar(); }
};

// Invokes both the (iterator, sentinel, ...) and the (range, ...) overloads of the given niebloid.
// Invokes both the (iterator, sentinel, ...) and the (range, ...) overloads of the given algorithm function object.

// (in, ...)
template <class Func, std::ranges::range Input, class... Args>
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13 changes: 8 additions & 5 deletions .../std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp
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Expand Up @@ -9,6 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// REQUIRES: stdlib=libc++

// [alg.func.obj]
// [algorithms.requirements]/2
// [range.iter.ops.general]/2

Expand All @@ -24,12 +25,14 @@

#include "test_macros.h"

// Niebloids, unlike CPOs, are *not* required to be semiregular or even to have
// a declared type at all; they are specified as "magic" overload sets whose
// names are not found by argument-dependent lookup and which inhibit
// argument-dependent lookup if they are found via a `using`-declaration.
// Before P3136R1, niebloids were pedantically not CPOs, and they were *not* required to be semiregular or
// even to have a declared type at all; they were specified as "magic" overload sets
// whose names are not found by argument-dependent lookup and
// which inhibit argument-dependent lookup if they are found via a `using`-declaration.
//
// libc++ implements them using the same function-object technique we use for CPOs;
// As of P3136R1, niebloids (formally known as algorithm function objects) are required to be CPOs.
//
// libc++ always implements niebloids in the same way as CPOs;
// therefore this file should stay in sync with ./cpo.compile.pass.cpp.

template <class CPO, class... Args>
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