P1206R7 Conversions From Ranges To Containers

[CaseyCarter]

<ranges>: Implement ranges::to, guarded by __cpp_lib_ranges_to_container.

The following are all guarded by __cpp_lib_containers_ranges:
<xmemory>: Generalize _Uninitialized_copy to iterator+sentinel ranges; add _Uninitialized_copy_n for counted ranges. Implement from_range_t, from_range, and exposition-only helper concepts / type aliases.
<xutility>: Promote _Get_final_iterator_unwrapped here from <algorithm>. Add _Copy_memmove_n (_Copy_n_unchecked), similar to _Copy_memmove (resp. _Copy_unchecked) but for counted ranges. Generalize _Iter_copy_cat to _Sent_copy_cat.
<memory>: Use _Copy_memmove_n (see <xutility>) as appropriate.

<yvals_core.h>: _HAS_CXX23 controls P1206R7, define __cpp_lib_containers_ranges and __cpp_lib_ranges_to_container.

<deque>: Implement from_range_t constructor(s) and corresponding deduction guide(s), prepend_range, append_range, assign_range, and insert_range.
<forward_list>: Implement from_range_t constructor(s) and corresponding deduction guide(s), prepend_range, assign_range, and insert_range_after.
<list>: Implement from_range_t constructor(s) and corresponding deduction guide(s), prepend_range, append_range, assign_range, and insert_range.
<map> and <set>: For both map, multimap, set, and multiset, implement from_range_t constructor(s) and corresponding deduction guide(s). (Inherit insert_range from _Tree.)
<queue>: For both queue and priority_queue, implement from_range_t constructor(s) and corresponding deduction guide(s), and push_range. (I've speculatively implemented priority_queue::push_range by calling append_range on the container per the resolution I've proposed for an LWG issue I submitted specifically to allow implementation via append_range.)
<stack>: Implement from_range_t constructor(s) and corresponding deduction guide(s), and push_range.
<unordered_map> and <unordered_set>: For both unordered_map, unordered_multimap, unordered_set, and unordered_multiset, implement from_range_t constructor(s) and corresponding deduction guide(s). (Inherit insert_range from _Hash.)
<vector>: For both vector and vector<bool>, implement from_range_t constructor(s) and corresponding deduction guide(s), append_range, assign_range, and insert_range.
<xstring>: For both basic_string, implement from_range_t constructor(s) and corresponding deduction guide(s), append_range, assign_range, insert_range, and replace_with_range.

Test both new feature-test macros in tests/std/tests/VSO_0157762_feature_test_macros.
Test all new deduction guides in tests/std/tests/P0433R2_deduction_guides.
Test _Copy_n_unchecked in tests/std/tests/P0784R7_library_machinery.
Add new tP1206R7_{container}_{operation} "range algorithm"-style tests for each new container (or container adapter) member function.
Add new P1206R7_from_range test for from_range and from_range_t.
Add new P1206R7_ranges_to test for ranges::to.

Fixes #2532.

[StephanTLavavej]

There are numerous real test failures - please investigate, fix, and verify before we begin reviewing this small PR. 😹

[frederick-vs-ja]

A strange value 202200L is used to test feature-test macros.

I have not idea why the test for deque failed now...

[frederick-vs-ja]

We shouldn't use _RERAISE again (see #2308).

[miscco]

Partial review until ranges header

[miscco]

Partial review until xstring

[StephanTLavavej]

Extremely partial video code review 😹

[StephanTLavavej]

Another partial video review 📺 and more progress! I've reviewed:

• algorithm
• deque
• forward_list
• list
• xhash/unordered_map/unordered_set
• xtree/map/set
• xutility
• yvals_core.h
• feature-test macros test

[StephanTLavavej]

@CaseyCarter @strega-nil-ms I've pushed changes nicely structured as a series of commits for double-checking. Please meow if you have meows!

[strega-nil-ms]

I am so excited to have ranges::to for tests!

[CaseyCarter]

@CaseyCarter @strega-nil-ms I've pushed changes nicely structured as a series of commits for double-checking. Please meow if you have meows!

Thanks for keeping these short and simple - very easy to review. You know, compared to, say, a hypothetical 7,000 line change.

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[StephanTLavavej]

Thanks for implementing this tiny feature - I believe that to is the shortest function name in the STL! 🐈 😻 😹

[hewillk]

I noticed this issue recently too.
And when I used MSVC-STL for resolution validation I found that you already dealt with it. Are you planning to file this LWG and stride_view::iterator::operator+= recently?