Several range algorithms #565

CaseyCarter · 2020-02-28T06:58:28Z

Description

[NB: This includes the changes in #514 for coherence, we need to merge that PR first.]

In <algorithm>, implement:

the generic algorithm result types from P2106R0 (lines 75-227)
ranges::for_each and its result alias for_each_result (lines 289-322)
ranges::for_each_n and its result alias for_each_result_n (lines 324-351) from P1243R4
ranges::find (lines 353-384)
ranges::find_if (lines 396-426)
ranges::find_if_not (lines 454-484)
ranges::count (lines 526-568)
ranges::count_if (lines 587-617)
ranges::mismatch and its result alias mismatch_result (lines 798-891)
ranges::equal (lines 893-980)
ranges::all_of (lines 1006-1033)
ranges::any_of (lines 1060-1087)
ranges::none_of (lines 1114-1141)
ranges::copy and its result alias copy_result (lines 1143-1175)
ranges::copy_n and its result alias copy_n_result (lines 1177-1207)
ranges::copy_if and its result alias copy_if_result (lines 1262-1302)

In <concepts>:

implement LWG-3194 which includes the resolution of LWG-3151 (lines 51-53)
LWG-3175 has been merged, remove conditional implementation (line 183)
replace boolean concept with boolean-testable concept from P1964R2 (lines 198-237, 283)
move movable (pun intended) into synopsis order (lines 254-256)
Modify concept copyable per P2102R0 (lines 260-261)
Implement concept equivalence_relation from P1716R3 (lines 290-293)

In <xutility>:

promote identity from <functional> for visibility in <algorithm> (lines 160-168)
promote common_range from <ranges> for visibility in <algorithm> (lines 3091-3095)
remove LWG-3247 and LWG-3299 annotations (lines 622, 626, and 963)
prefix indirectly_ to the names of readable_traits, readable, and writable (a great many lines); and modify iter_value_t (lines 366-367), iter_reference_t (lines ), iter_difference_t, iter_rvalue_reference_t, indirectly_readable (lines 688-701) and indirectly_swappable per P1878R1
define alias template _Make_unsigned_like_t to implement P1522R1's make-unsigned-like-t (it does nothing interesting yet, since we provide no integer-class types) (lines 727-729)
implement the "Indirect callable" concepts indirectly_unary_invocable, indirectly_regular_unary_invocable, indirect_unary_predicate, indirect_binary_predicate, and helpers indirect_result_t and projected (lines 852-926)
implement indirectly_copyable concept (lines 939-952)
implement indirectly_swappable, indirectly_comparable concepts (lines 1032-1061)
rename safe_range and enable_safe_range to borrowed_range and enable_borrowed_range per LWG-3379 (lines 2168-2173 and 2327-2330)
remove "Implements D2091R0" comments (various lines in 2175-2710)
add ranges::data to the list of access CPOs that hard error for arrays of incomplete element types (lines 2204-2205 and 2277-2278)
ranges::empty rejects arrays of unbound bound per P2091R0 (lines 2664-2692)
implement concept _Not_same_as (the exposition-only not-same-as from the working draft) (lines 3087-3089)
implement ranges::dangling (lines 3097-3102)
implement ranges::borrowed_iterator_t (lines 3104-3106)

In <yvals_core.h>:

Indicate implementation of:
- P1207R4 Movability of Single-Pass Iterators
- P1248R1 Fixing Relations
- P1474R1 Helpful Pointers For contiguous_iterator
- P1716R3 Range Comparison Algorithms Are Over-Constrained
- P1878R1 Constraining Readable Types
- P1964R2 Replacing boolean with boolean-testable
- P2091R0 Fixing Issues With Range Access CPOs
- P2102R0 Make "implicit expression variations" More Explicit
and partial implementation of:
- P1243R4 Rangify New Algorithms
remove conditional definition of _HAS_STD_BOOLEAN (we never has std::boolean now)

tests/std/include/instantiate_algorithms.hpp:

define non-movable type Immobile, and use it to ensure that standard algorithms neither copy nor move random number generators nor uniform random bit generators

Add header tests/std/include/range_algorithm_support.hpp with support machinery for the ranges algorithm tests. It notably defines:

is_permissive for determining whether we are compiling in MSVC's permissive mode (lines 18-37)
A class template borrowed<bool> whose specializations always model range and model borrowed_range iff the template parameter is true (lines 39-46)
Function objects get_first and get_second which project the pertinent member from pair arguments (lines 48-54)
A class template move_only_range<T> which adapts a contiguous_range of T into a move-only view with move-only input_iterators (lines 56-150)
A "phony" iterator class template test_iterator with tunable category, value type, and difference capability for instantiation tests (lines 152-363)
A similar "phony" class template test_range with tunable category, size, and commonality (i.e., is the sentinel type the same as the iterator type) (lines 365-423)
"phony" predicate and projection types for instantiation tests (lines 425-442)
combinatoric instantiation machinery for instantiation tests that instantiate with all interesting kinds of output iterators or input ranges (lines 444-529)

A new compile-only test tests/std/tests/P0896R4_ranges_algorithm_machinery which covers:

indirectly_unary_invocable/indirectly_regular_unary_invocable
indirect_unary_predicate/indirect_binary_predicate/indirect_result_t
projected
indirectly_copyable/indirectly_swappable/indirectly_comparable
dangling/borrowed_iterator_t
the result types in_found_result/in_fun_result/in_in_result/in_out_result/in_in_out_result/in_out_out_result/min_max_result

Very simple smoke and instantiation tests for the 15 new algorithms in:

tests/std/tests/P0896R4_ranges_alg_all_of
tests/std/tests/P0896R4_ranges_alg_any_of
tests/std/tests/P0896R4_ranges_alg_copy
tests/std/tests/P0896R4_ranges_alg_copy_if
tests/std/tests/P0896R4_ranges_alg_copy_n
tests/std/tests/P0896R4_ranges_alg_count
tests/std/tests/P0896R4_ranges_alg_count_if
tests/std/tests/P0896R4_ranges_alg_equal
tests/std/tests/P0896R4_ranges_alg_find
tests/std/tests/P0896R4_ranges_alg_find_if
tests/std/tests/P0896R4_ranges_alg_find_if_not
tests/std/tests/P0896R4_ranges_alg_for_each
tests/std/tests/P0896R4_ranges_alg_for_each_n
tests/std/tests/P0896R4_ranges_alg_mismatch
tests/std/tests/P0896R4_ranges_alg_none_of

Resolves:

<concepts>: LWG-3175 has been accepted, so we should remove commented-out code #537 <concepts>: LWG-3175 has been accepted, so we should remove commented-out code
LWG-3194 ConvertibleTo prose does not match code #540 LWG-3194 ConvertibleTo prose does not match code
LWG-3379 safe in several library names is misleading #546 LWG-3379 safe in several library names is misleading
P1964R2 Replacing boolean With boolean-testable #559 P1964R2 "Replacing boolean with boolean-testable"
P2102R0 Making "Implicit Expression Variations" More Explicit #561 P2102R0 "Making 'Implicit Expression Variations' More Explicit"
P2091R0 Fixing Issues With Range Access CPOs #563 P2091R0 "Fixing Issues With Range Access CPOs"

[This is a dual of internal MSVC-PR-232367.]

Checklist

Be sure you've read README.md and understand the scope of this repo.

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leave this unchecked for initial submission).
These changes introduce no known ABI breaks (adding members, renaming
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These changes were written from scratch using only this repository,
the C++ Working Draft (including any cited standards), other WG21 papers
(excluding reference implementations outside of proposed standard wording),
and LWG issues as reference material. If they were derived from a project
that's already listed in NOTICE.txt, that's fine, but please mention it.
If they were derived from any other project (including Boost and libc++,
which are not yet listed in NOTICE.txt), you must mention it here,
so we can determine whether the license is compatible and what else needs
to be done.

[NB: This includes the changes in microsoft#514 for coherence, we need to merge that PR first.] In `<algorithm>`, implement: * the generic algorithm result types from P2106R0 (lines 75-227) * `ranges::for_each` and its result alias `for_each_result` (lines 289-322) * `ranges::for_each_n` and its result alias `for_each_result_n` (lines 324-351) from P1243R4 * `ranges::find` (lines 353-384) * `ranges::find_if` (lines 396-426) * `ranges::find_if_not` (lines 454-484) * `ranges::count` (lines 526-568) * `ranges::count_if` (lines 587-617) * `ranges::mismatch` and its result alias `mismatch_result` (lines 798-891) * `ranges::equal` (lines 893-980) * `ranges::all_of` (lines 1006-1033) * `ranges::any_of` (lines 1060-1087) * `ranges::none_of` (lines 1114-1141) * `ranges::copy` and its result alias `copy_result` (lines 1143-1175) * `ranges::copy_n` and its result alias `copy_n_result` (lines 1177-1207) * `ranges::copy_if` and its result alias `copy_if_result` (lines 1262-1302) In `<concepts>`: * implement LWG-3194 which includes the resolution of LWG-3151 (lines 51-53) * LWG-3175 has been merged, remove conditional implementation (line 183) * replace `boolean` concept with _`boolean-testable`_ concept from P1964R2 (lines 198-237, 283) * move `movable` (pun intended) into synopsis order (lines 254-256) * Modify concept `copyable` per P2102R0 (lines 260-261) * Implement concept `equivalence_relation` from P1716R3 (lines 290-293) In `<xutility>`: * promote `identity` from `<functional>` for visibility in `<algorithm>` (lines 160-168) * promote `common_range` from `<ranges>` for visibility in `<algorithm>` (lines 3091-3095) * remove LWG-3247 and LWG-3299 annotations (lines 622, 626, and 963) * prefix `indirectly_` to the names of `readable_traits`, `readable`, and `writable` (a great many lines); and modify `iter_value_t` (lines 366-367), `iter_reference_t` (lines ), `iter_difference_t`, `iter_rvalue_reference_t`, `indirectly_readable` (lines 688-701) and `indirectly_swappable` per P1878R1 * define alias template `_Make_unsigned_like_t` to implement P1522R1's _`make-unsigned-like-t`_ (it does nothing interesting yet, since we provide no integer-class types) (lines 727-729) * implement the "Indirect callable" concepts `indirectly_unary_invocable`, `indirectly_regular_unary_invocable`, `indirect_unary_predicate`, `indirect_binary_predicate`, `indirect_equivalence_relation`, `indirect_strict_weak_order`, and helpers `indirect_result_t` and `projected` (lines 852-926) * implement `indirectly_copyable` and `indirectly_copyable_storable` concepts (lines 939-952) * implement `indirectly_swappable`, `indirectly_comparable`, `permutable`, `mergeable`, and `sortable` concepts (lines 1032-1061) * rename `safe_range` and `enable_safe_range` to `borrowed_range` and `enable_borrowed_range` per LWG-3379 (lines 2168-2173 and 2327-2330) * remove "Implements D2091R0" comments (various lines in 2175-2710) * add `ranges::data` to the list of access CPOs that hard error for arrays of incomplete element types (lines 2204-2205 and 2277-2278) * `ranges::empty` rejects arrays of unbound bound per P2091R0 (lines 2664-2692) * implement concept `_Not_same_as` (the exposition-only _`not-same-as`_ from the working draft) (lines 3087-3089) * implement `ranges::dangling` (lines 3097-3102) * implement `ranges::borrowed_iterator_t` (lines 3104-3106) In `<yvals_core.h>`: * Indicate implementation of: * P1207R4 Movability of Single-Pass Iterators * P1248R1 Fixing Relations * P1474R1 Helpful Pointers For contiguous_iterator * P1716R3 Range Comparison Algorithms Are Over-Constrained * P1878R1 Constraining Readable Types * P1964R2 Replacing `boolean` with _`boolean-testable`_ * P2091R0 Fixing Issues With Range Access CPOs * P2102R0 Make "implicit expression variations" More Explicit * and partial implementation of: * P1243R4 Rangify New Algorithms * remove conditional definition of `_HAS_STD_BOOLEAN` (we never has `std::boolean` now) `tests/std/include/instantiate_algorithms.hpp`: * define non-movable type `Immobile`, and use it to ensure that standard algorithms neither copy nor move random number generators nor uniform random bit generators Add header `tests/std/include/range_algorithm_support.hpp` with support machinery for the ranges algorithm tests. It notably defines: * `is_permissive` for determining whether we are compiling in MSVC's permissive mode (lines 18-37) * A class template `borrowed<bool>` whose specializations always model `range` and model `borrowed_range` iff the template parameter is `true` (lines 39-46) * Function objects `get_first` and `get_second` which project the pertinent member from `pair` arguments (lines 48-54) * A class template `move_only_range<T>` which adapts a `contiguous_range` of `T` into a move-only `view` with move-only `input_iterator`s (lines 56-150) * A "phony" iterator class template `test_iterator` with tunable category, value type, and difference capability for instantiation tests (lines 152-363) * A similar "phony" class template `test_range` with tunable category, size, and commonality (i.e., is the sentinel type the same as the iterator type) (lines 365-423) * "phony" predicate and projection types for instantiation tests (lines 425-442) * combinatoric instantiation machinery for instantiation tests that instantiate with all interesting kinds of output iterators or input ranges (lines 444-529) A new compile-only test `tests/std/tests/P0896R4_ranges_algorithm_machinery` which covers: * `indirectly_unary_invocable`/`indirectly_regular_unary_invocable` * `indirect_unary_predicate`/`indirect_binary_predicate`/`indirect_result_t` * `projected` * `indirectly_copyable`/`indirectly_swappable`/`indirectly_comparable` * `dangling`/`borrowed_iterator_t` * the result types `in_found_result`/`in_fun_result`/`in_in_result`/`in_out_result`/`in_in_out_result`/`in_out_out_result`/`min_max_result` Very simple smoke and instantiation tests for the 15 new algorithms in: * `tests/std/tests/P0896R4_ranges_alg_all_of` * `tests/std/tests/P0896R4_ranges_alg_any_of` * `tests/std/tests/P0896R4_ranges_alg_copy` * `tests/std/tests/P0896R4_ranges_alg_copy_if` * `tests/std/tests/P0896R4_ranges_alg_copy_n` * `tests/std/tests/P0896R4_ranges_alg_count` * `tests/std/tests/P0896R4_ranges_alg_count_if` * `tests/std/tests/P0896R4_ranges_alg_equal` * `tests/std/tests/P0896R4_ranges_alg_find` * `tests/std/tests/P0896R4_ranges_alg_find_if` * `tests/std/tests/P0896R4_ranges_alg_find_if_not` * `tests/std/tests/P0896R4_ranges_alg_for_each` * `tests/std/tests/P0896R4_ranges_alg_for_each_n` * `tests/std/tests/P0896R4_ranges_alg_mismatch` * `tests/std/tests/P0896R4_ranges_alg_none_of` Resolves: * microsoft#537 `<concepts>`: LWG-3175 has been accepted, so we should remove commented-out code * microsoft#540 LWG-3194 `ConvertibleTo` prose does not match code * microsoft#546 LWG-3379 `safe` in several library names is misleading * microsoft#559 P1964R2 "Replacing `boolean` with _`boolean-testable`_" * microsoft#561 P2102R0 "Making 'Implicit Expression Variations' More Explicit" * microsoft#563 P2091R0 "Fixing Issues With Range Access CPOs"

miscco

Generally I believe that there should be a bigger focus on readability of the concepts. Currently a lot of the more complex concepts are really hard to grog due to unfortunate formatting. I believe that we would gain a lot by spending a few lines more to improve the general readability.

I know that this is a lot of inter twined stuff, but this PR is gargantuan. It would help a lot if small and trivial things like moving identity and renaming safe_range or readable_range would be inside their own PR so that the churn is not that bad.

One can always just base the PR upon the previous ones so one doesnt really loose anything

stl/inc/concepts

stl/inc/xutility

tests/std/include/range_algorithm_support.hpp

CaseyCarter · 2020-02-28T22:02:38Z

Generally I believe that there should be a bigger focus on readability of the concepts. Currently a lot of the more complex concepts are really hard to grog due to unfortunate formatting. I believe that we would gain a lot by spending a few lines more to improve the general readability.

I agree. I've been trying to format the constraint-expressions in concepts as clang-format would - with the expectation that it will reduce churn someday when clang-format learns to understand concepts and requires-clauses - but I've started cheating here and there when it helps readability. We should simply go all in and format them one-term-per-line (except for very simple cases) as in the Ranges TS.

I'll update the concept definitions that this PR touches, and file an issue (#570) to make a general audit.

I know that this is a lot of intertwined stuff, but this PR is gargantuan. It would help a lot if small and trivial things like moving identity and renaming safe_range or readable_range would be inside their own PR so that the churn is not that bad.

One can always just base the PR upon the previous ones so one doesn't really lose anything

I apologize to all reviewers: this is a textbook example of a bad PR. I'm trying to cram a large chunk of functionality into a single commit to ease porting to the 16.6 release branch. (This is coming in after the feature freeze via a special exception.)

stl/inc/algorithm

BillyONeal · 2020-02-28T23:25:04Z

stl/inc/algorithm

+
+        template <input_iterator _It, sentinel_for<_It> _Se, class _Pj = identity,
+            indirectly_unary_invocable<projected<_It, _Pj>> _Fn>
+        constexpr for_each_result<_It, _Fn> operator()(_It _First, _Se _Last, _Fn _Func, _Pj _Proj = {}) const {


I know this is hot under the wire for .6 but for future algorithms like this I think we need non-_Proj versions so that upgrading to the ranges version doesn't cause serious perf regressions.

All three of these comments:

non-projected overloads (or if constexpred "don't project when the projection is identity)

reusing bodies with both std and ranges algorithms

engaging low-level optimizations (memcpy, memcmp)

are interrelated in interesting ways. After thinking through some of the alternatives, I decided they are out of scope for this PR: I don't want to rush out a design, and I especially don't want to break anything in std and delay the release.

Note to self: collect these handwavy promises into the tentative Ranges plan-of-attack and post the result in #39.

BillyONeal · 2020-02-28T23:28:33Z

stl/inc/algorithm

+    using mismatch_result = in_in_result<_In, _Out>;
+
+    // VARIABLE ranges::mismatch
+    class _Mismatch_fn : private _Not_quite_object {


Should we be considering powering the older algorithms with these to avoid repeated definitions?

Yes, in the future ;)

Future-Casey is going to love Past-Casey

BillyONeal · 2020-02-28T23:53:04Z

stl/inc/algorithm

+            _Adl_verify_range(_First, _Last);
+            auto _UFirst      = _Get_unwrapped(_STD move(_First));
+            const auto _ULast = _Get_unwrapped(_STD move(_Last));
+            for (; _UFirst != _ULast; ++_UFirst, (void) ++_Result) {


Lack of attempt to memcpy makes me sad... :(

Yes, future work ;)

tests/std/include/range_algorithm_support.hpp

BillyONeal

I haven't checked that all these things actually do what the Standard says, but given that you wrote most of that .... :)

tests/std/tests/P0896R4_ranges_alg_equal/test.cpp

tests/std/tests/P0896R4_ranges_alg_find/test.cpp

tests/std/tests/P0896R4_ranges_algorithm_machinery/test.cpp

* Use an asymmetric predicate to test `ranges::equal` * Mirror the structure if `ranges::find_if`'s test in the `ranges::find` test * Remove unused and untested concepts `indirect_equivalence_relation`, `indirect_strict_weak_order`, `indirectly_copyable_storable`, `permutable`, `mergeable`, and `sortable`

stl/inc/algorithm

tests/std/tests/P0898R3_concepts/test.cpp

tests/std/tests/P0896R4_ranges_iterator_machinery/test.cpp

tests/std/tests/P0122R7_span/test.cpp

stl/inc/yvals_core.h

tests/std/tests/P0896R4_ranges_alg_count_if/test.cpp

tests/std/tests/P0896R4_ranges_alg_equal/test.cpp

tests/std/tests/P0896R4_ranges_alg_find_if/test.cpp

tests/std/tests/P0896R4_ranges_alg_mismatch/test.cpp

stl/inc/algorithm

StephanTLavavej

One naming typo, otherwise great. Thanks!

tests/std/tests/P0896R4_ranges_alg_mismatch/test.cpp

Several range algorithms (microsoft#565)

miscco · 2020-03-05T07:26:48Z

Is there a price for "Highest number of issues closed with a single PR"?

Great work 🚀

CaseyCarter requested a review from a team as a code owner February 28, 2020 06:58

CaseyCarter self-assigned this Feb 28, 2020

CaseyCarter added the cxx20 C++20 feature label Feb 28, 2020

miscco reviewed Feb 28, 2020

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CaseyCarter mentioned this pull request Feb 28, 2020

STL: Cleanup concept definitions #570

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Merge remote-tracking branch 'origin/master' into alg

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CaseyCarter requested review from BillyONeal and StephanTLavavej March 4, 2020 07:41

Missed review comment to rename P1870R1 in yvals_core.h

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<functional> Avoid layers of forwards in invoke #585

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Remove last vestiges of "out" from the mismatch test

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Implement range_size_t #514

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Merge pull request #46 from microsoft/master

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Several range algorithms (microsoft#565)

CaseyCarter deleted the alg branch March 5, 2020 16:19

CaseyCarter mentioned this pull request Mar 16, 2020

P0896R4 <ranges> #39

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Modernize ranges::copy #956

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Meta LWG issue: 2021-10 meeting #2236

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frederick-vs-ja mentioned this pull request May 30, 2025

<xutility>: Usage of decltype(auto) in the operator() of ranges::iter_move's type seems buggy #5555

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Several range algorithms #565

Several range algorithms #565

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