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By calling `std::move` for related functions when the iterator is
possibly input-only. Also slightly changes the conditions of branch for
contiguous iterators to avoid error.
Fixes #116502
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Found while running libc++'s test suite with MSVC's STL.
This is structured into a series of commits for easier reviewing; I
could also split this into smaller PRs if desired.
* Add void-casts for `invoke_r` calls to fix MSVC STL `[[nodiscard]]`
warnings.
+ Our rationale is that if someone is calling `invoke_r<NonVoidType>`,
it sure looks like they care about the return value.
* Add `[[maybe_unused]]` to silence `-Wunused-parameter` warnings.
+ This happens because the parameters are used within `LIBCPP_ASSERT`,
which vanishes for MSVC's STL. This also motivates the following
changes.
* Add `[[maybe_unused]]` to fix `-Wunused-variable` warnings.
* Always void-cast `debug_comparisons` to fix `-Wunused-variable`
warnings.
+ As this was already unused with a void-cast in one
`_LIBCPP_HARDENING_MODE` branch, I'm simply lifting it next to the
variable definition.
* Add `[[maybe_unused]]` to fix `-Wunused-local-typedef` warnings.
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(`ranges::to`):
- add the `from_range_t` constructors and the related deduction guides;
- add the `insert_range`/`assign_range`/etc. member functions.
(Note: this patch is split from https://reviews.llvm.org/D142335)
Differential Revision: https://reviews.llvm.org/D149832
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