On Mon, 17 Apr 2023, 05:28 Patrick Palka via Libstdc++, <
libstd...@gcc.gnu.org> wrote:
> On Fri, 14 Apr 2023, Patrick Palka wrote:
>
> > Tested on x86_64-pc-linux-gnu, does this look OK for trunk?
> >
> > PR libstdc++/108827
> >
> > libstdc++-v3/ChangeLog:
> >
> > * include/bits/ranges_cmp.h (__cpp_lib_ranges): Bump value
> > for C++23.
> > * include/std/ranges (range_adaptor_closure): Define for C++23.
> > * include/std/version (__cpp_lib_ranges): Bump value for
> > C++23.
> > * testsuite/std/ranges/version_c++23.cc: Bump expected value
> > of __cpp_lib_ranges.
> > * testsuite/std/ranges/range_adaptor_closure.cc: New test.
>
> Here's a standalone version of this patch (not dependent on the first
> patch in the series) it terms of the current non-CRTP representation
> of _RangeAdaptorClosure:
>
OK, thanks for separating this from the other change.
> -- >8 --
>
> Subject: [PATCH] libstdc++: Implement range_adaptor_closure from P2387R3
> [PR108827]
>
> Tested on x86_64-pc-linux-gnu, does this look OK for trunk?
>
> PR libstdc++/108827
>
> libstdc++-v3/ChangeLog:
>
> * include/bits/ranges_cmp.h (__cpp_lib_ranges): Bump value
> for C++23.
> * include/std/ranges (range_adaptor_closure): Define for C++23.
> * include/std/version (__cpp_lib_ranges): Bump value for
> C++23.
> * testsuite/std/ranges/version_c++23.cc: Bump expected value
> of __cpp_lib_ranges.
> * testsuite/std/ranges/range_adaptor_closure.cc: New test.
> ---
> libstdc++-v3/include/bits/ranges_cmp.h | 4 ++
> libstdc++-v3/include/std/ranges | 8 ++++
> libstdc++-v3/include/std/version | 3 ++
> .../std/ranges/range_adaptor_closure.cc | 46 +++++++++++++++++++
> .../testsuite/std/ranges/version_c++23.cc | 2 +-
> 5 files changed, 62 insertions(+), 1 deletion(-)
> create mode 100644
> libstdc++-v3/testsuite/std/ranges/range_adaptor_closure.cc
>
> diff --git a/libstdc++-v3/include/bits/ranges_cmp.h
> b/libstdc++-v3/include/bits/ranges_cmp.h
> index 85c1a77ccf7..6710d829a37 100644
> --- a/libstdc++-v3/include/bits/ranges_cmp.h
> +++ b/libstdc++-v3/include/bits/ranges_cmp.h
> @@ -57,7 +57,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>
> #ifdef __cpp_lib_concepts
> // Define this here, included by all the headers that need to define it.
> +#if __cplusplus > 202002L
> +#define __cpp_lib_ranges 202202L
> +#else
> #define __cpp_lib_ranges 202110L
> +#endif
>
> namespace ranges
> {
> diff --git a/libstdc++-v3/include/std/ranges
> b/libstdc++-v3/include/std/ranges
> index 1714f3fb16c..c4d4d85bf90 100644
> --- a/libstdc++-v3/include/std/ranges
> +++ b/libstdc++-v3/include/std/ranges
> @@ -1122,6 +1122,14 @@ namespace views::__adaptor
> };
> } // namespace views::__adaptor
>
> +#if __cplusplus > 202002L
> + template<typename _Derived>
> + requires is_class_v<_Derived> && same_as<_Derived,
> remove_cv_t<_Derived>>
> + class range_adaptor_closure
> + : public views::__adaptor::_RangeAdaptorClosure
> + { };
> +#endif
> +
> template<range _Range> requires is_object_v<_Range>
> class ref_view : public view_interface<ref_view<_Range>>
> {
> diff --git a/libstdc++-v3/include/std/version
> b/libstdc++-v3/include/std/version
> index 027e5711ec5..02ead8f1443 100644
> --- a/libstdc++-v3/include/std/version
> +++ b/libstdc++-v3/include/std/version
> @@ -265,8 +265,10 @@
> #define __cpp_lib_interpolate 201902L
> #if __cpp_lib_concepts
> # define __cpp_lib_move_iterator_concept 202207L
> +#if __cplusplus <= 202002L // N.B. updated value in C++23
> # define __cpp_lib_ranges 202110L
> #endif
> +#endif
> #define __cpp_lib_shift 201806L
>
> #if _GLIBCXX_HOSTED
> @@ -330,6 +332,7 @@
> #define __cpp_lib_reference_from_temporary 202202L
> #define __cpp_lib_to_underlying 202102L
> #define __cpp_lib_unreachable 202202L
> +#define __cpp_lib_ranges 202202L
> #define __cpp_lib_ranges_zip 202110L
> #define __cpp_lib_ranges_chunk 202202L
> #define __cpp_lib_ranges_slide 202202L
> diff --git a/libstdc++-v3/testsuite/std/ranges/range_adaptor_closure.cc
> b/libstdc++-v3/testsuite/std/ranges/range_adaptor_closure.cc
> new file mode 100644
> index 00000000000..6221f071331
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/std/ranges/range_adaptor_closure.cc
> @@ -0,0 +1,46 @@
> +// { dg-options "-std=gnu++23" }
> +// { dg-do run { target c++23 } }
> +
> +#include <ranges>
> +#include <algorithm>
> +#include <testsuite_hooks.h>
> +
> +namespace ranges = std::ranges;
> +namespace views = std::views;
> +
> +struct _Negate : ranges::range_adaptor_closure<_Negate>
> +{
> + template<ranges::viewable_range _Range>
> + constexpr auto
> + operator()(_Range&& __r) const
> + requires requires { views::transform(std::declval<_Range>(),
> std::negate{}); }
> + { return views::transform(std::forward<_Range>(__r), std::negate{}); }
> +};
> +
> +constexpr _Negate negate;
> +
> +constexpr bool
> +test01()
> +{
> + int x[] = {1, 2, 3};
> + VERIFY( ranges::equal(x | negate, (int[]){-1, -2, -3}) );
> + VERIFY( ranges::equal(x | negate | negate, x) );
> + VERIFY( ranges::equal(x | (negate | negate), x) );
> + VERIFY( ranges::equal(x | views::reverse | negate, x | negate |
> views::reverse) );
> + VERIFY( ranges::equal(x | (views::reverse | negate), x | (negate |
> views::reverse)) );
> +#if 0
> + // These asserts currently fail for the same reason as the disabled
> asserts
> + // in std/ranges/adaptors/all.cc.
> + static_assert( sizeof(negate | views::reverse | views::join) == 1 );
> + static_assert( sizeof(views::reverse | negate | views::join) == 1 );
> + static_assert( sizeof(views::reverse | views::join | negate) == 1 );
> +#endif
> +
> + return true;
> +}
> +
> +int
> +main()
> +{
> + static_assert(test01());
> +}
> diff --git a/libstdc++-v3/testsuite/std/ranges/version_c++23.cc
> b/libstdc++-v3/testsuite/std/ranges/version_c++23.cc
> index 04609bb602c..e8342fa986a 100644
> --- a/libstdc++-v3/testsuite/std/ranges/version_c++23.cc
> +++ b/libstdc++-v3/testsuite/std/ranges/version_c++23.cc
> @@ -4,7 +4,7 @@
> #include <version>
>
> #if __STDC_HOSTED__
> -# if __cpp_lib_ranges != 202110L
> +# if __cpp_lib_ranges != 202202L
> # error "Feature-test macro __cpp_lib_ranges has wrong value in
> <version>"
> # endif
> #endif
> --
> 2.40.0.335.g9857273be0
>
>
