Casey's miscellaneous changes, definitive edition #5014
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Define a new macro instead of conditionally inserting `_CONSTEXPR20`. Drive-by: Combine nested conditionals.
…_library_header_units`
Discovered this has been fixed in 19.1.0 after reducing a repro to file.
We had to workaround the fact that hidden friends aren't hidden in permissive mode by stuffing `unreachable_sentinel_t`'s `operator==` into a detail namespace. Now that the changes to C++20 relational expressions are implemented, we can use a member `operator==` instead of a `friend` to more simply achieve the same effect. See https://godbolt.org/z/x5ffjdxYf for a proof-of-concept.
* Remove nested type names that are extraneous in C++20 to help us avoid depending on the existence of said nested type names. * Always declare the "nested 5 iterator traits" (or the subset of them a given iterator provides) in canonical order at the top of the first public section in a class body. * When the "nested 5 iterator traits" _are_ available, use their names in the semantically appropriate places in member function declarations. For example, `reference operator*() const`.
For consistency with other algorithms that take unwrapped iterators.
`_Unchecked_begin`/`_Unchecked_end` are semi-documented, so their presence doesn't necessarily indicate a specialization is library-defined. Use our `_Is_from_primary` tech, and remove the now-unused `_Has_unchecked_begin_end`.
`_Uninitialized_copy`, `_Uninitialized_copy_n`, and `_Uninitialized_move` in `<xmemory>` are internal-only, and trust that the caller has passed arguments that denote a valid range. I am not so trusting. `_STL_INTERNAL_CHECK((_STD _Adl_verify_range(_First, _Last), true))` feels like a bit of a hack - I could be convinced to simply wrap the `_Adl_verify_range` call in `#ifdef _ENABLE_STL_INTERNAL_CHECK`.
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"I don't need to redo the full test run; surely this small |
…te a range They must per N4988 [range.subrange.ctor] para 1 and 3. As a rule, we never verify that `[begin(meow), end(meow))` for a range `meow` actually denotes a range, so `subrange`'s constructors are the only chance we have to verify these user-supplied values.
StephanTLavavej
requested changes
Oct 14, 2024
tests/std/tests/GH_004109_iter_value_t_direct_initialization/test.compile.pass.cpp
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tests/std/tests/P2165R4_tuple_like_relational_operators/test.compile.pass.cpp
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StephanTLavavej
approved these changes
Oct 14, 2024
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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Nice bite-sized commits:
Improve formatting of
_Default_allocate_traits; define a new macro instead of conditionally inserting_CONSTEXPR20. Drive-by: Combine nested conditionals.Fix
TRANSITIONcomment for disabled EDG config inP1502R1_standard_library_header_units.Annotate workaround for Clang constrained-friends issue with
TRANSITION, Clang 19. I discovered this has been fixed in 19.1.0 after reducing a repro to file, didn't try to dig up the fix.Remove extraneous
constexprinP2502R2_generatorSimplify
unreachable_sentinel_t. We had to workaround the fact that hidden friends aren't hidden in permissive mode by stuffingunreachable_sentinel_t'soperator==into a detail namespace. Now that the changes to C++20 relational expressions are implemented, we can use a memberoperator==instead of afriendto more simply achieve the same effect. See https://godbolt.org/z/x5ffjdxYf for a proof-of-concept.Uniformly annotate undefined members of fake iterators
Cleanup some iterator definitions
reference operator*() const.Rename
_Merge_moveto_Merge_move_uncheckedfor consistency with other algorithms that take unwrapped iterators.Improve detection of library-defined
arrayspecializations._Unchecked_begin/_Unchecked_endare semi-documented, so their presence doesn't necessarily indicate a specialization is library-defined. Use our_Is_from_primarytech, and remove the now-unused_Has_unchecked_begin_end.Add some internal checks to internal algorithms.
_Uninitialized_copy,_Uninitialized_copy_n, and_Uninitialized_movein<xmemory>are internal-only, and trust that the caller has passed arguments that denote a valid range. I am not so trusting._STL_INTERNAL_CHECK((_STD _Adl_verify_range(_First, _Last), true))feels like a bit of a hack - I could be convinced to simply wrap the_Adl_verify_rangecall in#ifdef _ENABLE_STL_INTERNAL_CHECK.Verify that arguments to
subrange's iter/sentinel constructors denote a range. They must per N4988 [range.subrange.ctor] para 1 and 3. As a rule, we never verify that[begin(meow), end(meow))for a rangemeowactually denotes a range, sosubrange's constructors are the only chance we have to verify these user-supplied values.