P1206R7 Conversions From Ranges To Containers ``: Implement `ranges::to`, guarded by `__cpp_lib_ranges_to_container`. The following are all guarded by `__cpp_lib_containers_ranges`: ``: 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. ``: Promote `_Get_final_iterator_unwrapped` here from ``. 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`. ``: Use `_Copy_memmove_n` (see ``) as appropriate. ``: `_HAS_CXX23` controls P1206R7, define `__cpp_lib_containers_ranges` and `__cpp_lib_ranges_to_container`. ``: Implement `from_range_t` constructor(s) and corresponding deduction guide(s), `prepend_range`, `append_range`, `assign_range`, and `insert_range`. ``: Implement `from_range_t` constructor(s) and corresponding deduction guide(s), `prepend_range`, `assign_range`, and `insert_range_after`. ``: Implement `from_range_t` constructor(s) and corresponding deduction guide(s), `prepend_range`, `append_range`, `assign_range`, and `insert_range`. `` and ``: For both `map`, `multimap`, `set`, and `multiset`, implement `from_range_t` constructor(s) and corresponding deduction guide(s). (Inherit `insert_range` from `_Tree`.) ``: 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`.) ``: Implement `from_range_t` constructor(s) and corresponding deduction guide(s), and `push_range`. `` and ``: 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`.) ``: For both `vector` and `vector`, implement `from_range_t` constructor(s) and corresponding deduction guide(s), `append_range`, `assign_range`, and `insert_range`. ``: 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 t`P1206R7_{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.

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P1206R7 Conversions From Ranges To Containers #2532

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