Ah, sorry I got confused in the review suggestions, and latter when
checking the code.
What I meant is:
Because the incoming strided_layout is required to be unique,
that implies that for each of strides are greater or equal to the extents.
As a consequence, other.required_span_size() is always greater than equal
to size of index_space,
so we can have static assert like:
static_assert(__mdspan::__representable_size<_OExtents, index_type>,
"other.required_span_size() must be representable as index_type");
In here:
if constexpr (cmp_greater(
numeric_limits<typename _StridedMapping::index_type>::max(),
numeric_limits<index_type>::max()))
{
static_assert(__mdspan::__representable_size<_OExtents,
index_type>,
"other.required_span_size() must be representable as
index_type")
__glibcxx_assert(!cmp_less(numeric_limits<index_type>::max(),
__other.required_span_size()));
}
On Wed, Jun 4, 2025 at 1:09 PM Luc Grosheintz <luc.groshei...@gmail.com>
wrote:
>
>
> On 6/3/25 15:24, Tomasz Kaminski wrote:
> > On Fri, May 30, 2025 at 6:44 PM Luc Grosheintz <luc.groshei...@gmail.com
> >
> > wrote:
> >
> >> Implements the tests for layout_stride and for the features of the other
> >> two layouts that depend on layout_stride.
> >>
> >> libstdc++-v3/ChangeLog:
> >>
> >> * testsuite/23_containers/mdspan/layouts/class_mandate_neg.cc:
> Add
> >> tests for layout_stride.
> >> * testsuite/23_containers/mdspan/layouts/ctors.cc: Add test for
> >> layout_stride and the interaction with other layouts.
> >> * testsuite/23_containers/mdspan/layouts/mapping.cc: Ditto.
> >> * testsuite/23_containers/mdspan/layouts/stride.cc: New test.
> >>
> >> Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
> >> ---
> >>
> > LTGM. Only one comment regarding the tests that we could add.
> >
> >> .../mdspan/layouts/class_mandate_neg.cc | 3 +
> >> .../23_containers/mdspan/layouts/ctors.cc | 99 ++++
> >> .../23_containers/mdspan/layouts/empty.cc | 1 +
> >> .../23_containers/mdspan/layouts/mapping.cc | 75 ++-
> >> .../23_containers/mdspan/layouts/stride.cc | 526 ++++++++++++++++++
> >> 5 files changed, 703 insertions(+), 1 deletion(-)
> >> create mode 100644
> >> libstdc++-v3/testsuite/23_containers/mdspan/layouts/stride.cc
> >>
> >> diff --git
> >>
> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/class_mandate_neg.cc
> >>
> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/class_mandate_neg.cc
> >> index 6469fa601e9..6862ed0c0ae 100644
> >> ---
> >>
> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/class_mandate_neg.cc
> >> +++
> >>
> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/class_mandate_neg.cc
> >> @@ -31,9 +31,12 @@ template<size_t Count, typename Layout, typename
> >> OLayout>
> >>
> >> A<std::layout_left> a_left; // { dg-error
> "required
> >> from" }
> >> A<std::layout_right> a_right; // { dg-error
> "required
> >> from" }
> >> +A<std::layout_stride> a_stride; // { dg-error
> "required
> >> from" }
> >>
> >> B<1, std::layout_left, std::layout_left> bll; // { dg-error
> "required
> >> here" }
> >> +B<2, std::layout_left, std::layout_stride> bls; // { dg-error
> "required
> >> here" }
> >>
> > With the message that we added to static assert to layout_stride
> > constructor:
> > >> "other.required_span_size() must be representable as index_type"
> > I believe you could add here:
> > B<2, std::layout_stride, std::layout_left>
> > And similarly for layout_right.
>
> I've tried (even before) and always failed miserably. Only good news
> is that the final
>
> // { dg-prune-output "must be representable as index_type" }
>
> isn't superfluous. I seem like the only string I can match against
> is the one associated with that line of code, in this case that's
>
> mdspan:773: error: static assertion failed: The size of OtherExtents
> must be representable as index_type
> [ ... ]
> class_mandate_neg.cc:40: note: synthesized method 'constexpr B<4,
> std::layout_right, std::layout_stride>::B()' first required here
>
> I unsure why you're saying that we added the message:
>
> "other.required_span_size() must be representable as index_type"
>
> to a static_assert, we added it to a __glibcxx_assert. The tests here
> are designed to trigger different assertions.
>
> "A" triggers:
>
> template<typename _Extents>
> class layout_*::mapping
> {
> public:
> // ...
>
> static_assert(__mdspan::__representable_size<extents_type,
> index_type>,
> "The size of extents_type must be representable as index_type");
>
>
> "B" triggers:
>
> template<typename _OExtents>
> constexpr explicit
> mapping(const _OExtents& __oexts, __mdspan::__internal_ctor) noexcept
> : _M_extents(__oexts)
> {
> static_assert(__mdspan::__representable_size<_OExtents, index_type>,
> "The size of OtherExtents must be representable as index_type");
>
> We don't have tests that make __glibcxx_assert's fail. We could probably
> do it with constexpr variables with "dynamic" extents.
>
> >
> >>
> >> B<3, std::layout_right, std::layout_right> brr; // { dg-error
> "required
> >> here" }
> >> +B<4, std::layout_right, std::layout_stride> brs; // { dg-error
> "required
> >> here" }
> >>
> >> // { dg-prune-output "must be representable as index_type" }
> >> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/ctors.cc
> >> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/ctors.cc
> >> index b0e03161874..695e887ca87 100644
> >> --- a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/ctors.cc
> >> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/ctors.cc
> >> @@ -323,6 +323,104 @@ namespace from_left_or_right
> >> }
> >> }
> >>
> >> +// ctor: mapping(layout_stride::mapping<OExtents>)
> >> +namespace from_stride
> >> +{
> >> + template<typename Mapping>
> >> + constexpr auto
> >> + strides(Mapping m)
> >> + {
> >> + constexpr auto rank = Mapping::extents_type::rank();
> >> + std::array<typename Mapping::index_type, rank> s;
> >> +
> >> + if constexpr (rank > 0)
> >> + for(size_t i = 0; i < rank; ++i)
> >> + s[i] = m.stride(i);
> >> + return s;
> >> + }
> >> +
> >> + template<typename Layout, typename Extents, typename OExtents>
> >> + constexpr void
> >> + verify_convertible(OExtents oexts)
> >> + {
> >> + using Mapping = typename Layout::mapping<Extents>;
> >> + using OMapping = std::layout_stride::mapping<OExtents>;
> >> +
> >> + constexpr auto other = OMapping(oexts,
> >> strides(Mapping(Extents(oexts))));
> >> + if constexpr (std::is_same_v<Layout, std::layout_right>)
> >> + ::verify_nothrow_convertible<Mapping>(other);
> >> + else
> >> + ::verify_convertible<Mapping>(other);
> >> + }
> >> +
> >> + template<typename Layout, typename Extents, typename OExtents>
> >> + constexpr void
> >> + verify_constructible(OExtents oexts)
> >> + {
> >> + using Mapping = typename Layout::mapping<Extents>;
> >> + using OMapping = std::layout_stride::mapping<OExtents>;
> >> +
> >> + constexpr auto other = OMapping(oexts,
> >> strides(Mapping(Extents(oexts))));
> >> + if constexpr (std::is_same_v<Layout, std::layout_right>)
> >> + ::verify_nothrow_constructible<Mapping>(other);
> >> + else
> >> + ::verify_constructible<Mapping>(other);
> >> + }
> >> +
> >> + template<typename Layout>
> >> + constexpr bool
> >> + test_ctor()
> >> + {
> >> + assert_not_constructible<
> >> + typename Layout::mapping<std::extents<int>>,
> >> + std::layout_stride::mapping<std::extents<int, 1>>>();
> >> +
> >> + assert_not_constructible<
> >> + typename Layout::mapping<std::extents<int, 1>>,
> >> + std::layout_stride::mapping<std::extents<int>>>();
> >> +
> >> + assert_not_constructible<
> >> + typename Layout::mapping<std::extents<int, 2>>,
> >> + std::layout_stride::mapping<std::extents<int, 1>>>();
> >> +
> >> + verify_convertible<Layout,
> std::extents<int>>(std::extents<int>{});
> >> +
> >> + verify_convertible<Layout, std::extents<unsigned int>>(
> >> + std::extents<int>{});
> >> +
> >> + // Rank == 0 doesn't check IndexType for convertibility.
> >> + verify_convertible<Layout, std::extents<int>>(
> >> + std::extents<unsigned int>{});
> >> +
> >> + verify_constructible<Layout, std::extents<int, 3>>(
> >> + std::extents<int, 3>{});
> >> +
> >> + verify_constructible<Layout, std::extents<unsigned int, 3>>(
> >> + std::extents<int, 3>{});
> >> +
> >> + verify_constructible<Layout, std::extents<int, 3>>(
> >> + std::extents<unsigned int, 3>{});
> >> +
> >> + verify_constructible<Layout, std::extents<int, 3, 5>>(
> >> + std::extents<int, 3, 5>{});
> >> +
> >> + verify_constructible<Layout, std::extents<unsigned int, 3, 5>>(
> >> + std::extents<int, 3, 5>{});
> >> +
> >> + verify_constructible<Layout, std::extents<int, 3, 5>>(
> >> + std::extents<unsigned int, 3, 5>{});
> >> + return true;
> >> + }
> >> +
> >> + template<typename Layout>
> >> + constexpr void
> >> + test_all()
> >> + {
> >> + test_ctor<Layout>();
> >> + static_assert(test_ctor<Layout>());
> >> + }
> >> +}
> >> +
> >> template<typename Layout>
> >> constexpr void
> >> test_all()
> >> @@ -330,6 +428,7 @@ template<typename Layout>
> >> default_ctor::test_all<Layout>();
> >> from_extents::test_all<Layout>();
> >> from_same_layout::test_all<Layout>();
> >> + from_stride::test_all<Layout>();
> >> }
> >>
> >> int
> >> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/empty.cc
> >> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/empty.cc
> >> index dc2a95ebbe6..d550c0a8e84 100644
> >> --- a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/empty.cc
> >> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/empty.cc
> >> @@ -64,5 +64,6 @@ main()
> >> {
> >> static_assert(test_all<std::layout_left>());
> >> static_assert(test_all<std::layout_right>());
> >> + static_assert(test_all<std::layout_stride>());
> >> return 0;
> >> }
> >> diff --git
> >> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/mapping.cc
> >> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/mapping.cc
> >> index 4dc0db66865..963c804a369 100644
> >> --- a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/mapping.cc
> >> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/mapping.cc
> >> @@ -12,6 +12,7 @@ template<typename Layout, typename Extents>
> >> {
> >> using M = typename Layout::mapping<Extents>;
> >> static_assert(std::__mdspan::__is_extents<typename
> M::extents_type>);
> >> + static_assert(std::__mdspan::__mapping_alike<M>);
> >> static_assert(std::copyable<M>);
> >> static_assert(std::is_nothrow_move_constructible_v<M>);
> >> static_assert(std::is_nothrow_move_assignable_v<M>);
> >> @@ -30,6 +31,8 @@ template<typename Layout, typename Extents>
> >>
> >> static_assert(M::is_always_unique() && M::is_unique());
> >> static_assert(M::is_always_strided() && M::is_strided());
> >> + if constexpr (!std::is_same_v<Layout, std::layout_stride>)
> >> + static_assert(M::is_always_exhaustive() && M::is_exhaustive());
> >> return true;
> >> }
> >>
> >> @@ -105,6 +108,39 @@ template<typename Layout>
> >> { return exts; }
> >> };
> >>
> >> +template<>
> >> + struct MappingFactory<std::layout_stride>
> >> + {
> >> + template<typename Extents>
> >> + static constexpr std::layout_stride::mapping<Extents>
> >> + create(Extents exts)
> >> + {
> >> + if constexpr (Extents::rank() == 0)
> >> + {
> >> + auto strides = std::array<size_t, 0>{};
> >> + return std::layout_stride::mapping(exts, strides);
> >> + }
> >> + else if constexpr (Extents::rank() == 1)
> >> + {
> >> + auto strides = std::array<size_t, 1>{2};
> >> + return std::layout_stride::mapping(exts, strides);
> >> + }
> >> + else if constexpr (Extents::rank() == 2)
> >> + {
> >> + size_t m = exts.extent(1);
> >> + auto strides = std::array<size_t, 2>{3*m, 2};
> >> + return std::layout_stride::mapping(exts, strides);
> >> + }
> >> + else if constexpr (Extents::rank() == 3)
> >> + {
> >> + size_t n = exts.extent(0);
> >> + size_t m = exts.extent(1);
> >> + auto strides = std::array<size_t, 3>{3*m, 2, 11*m*n};
> >> + return std::layout_stride::mapping(exts, strides);
> >> + }
> >> + }
> >> + };
> >> +
> >> template<typename Layout>
> >> constexpr void
> >> test_linear_index_3d()
> >> @@ -280,6 +316,16 @@ template<typename Layout>
> >> VERIFY(m.stride(0) == 1);
> >> }
> >>
> >> +template<>
> >> + constexpr void
> >> + test_stride_1d<std::layout_stride>()
> >> + {
> >> + std::array<int, 1> strides{13};
> >> + std::layout_stride::mapping m(std::extents<int, 3>{}, strides);
> >> + VERIFY(m.stride(0) == strides[0]);
> >> + VERIFY(m.strides() == strides);
> >> + }
> >> +
> >> template<typename Layout>
> >> constexpr void
> >> test_stride_2d();
> >> @@ -302,6 +348,17 @@ template<>
> >> VERIFY(m.stride(1) == 1);
> >> }
> >>
> >> +template<>
> >> + constexpr void
> >> + test_stride_2d<std::layout_stride>()
> >> + {
> >> + std::array<int, 2> strides{13, 2};
> >> + std::layout_stride::mapping m(std::extents<int, 3, 5>{}, strides);
> >> + VERIFY(m.stride(0) == strides[0]);
> >> + VERIFY(m.stride(1) == strides[1]);
> >> + VERIFY(m.strides() == strides);
> >> + }
> >> +
> >> template<typename Layout>
> >> constexpr void
> >> test_stride_3d();
> >> @@ -326,6 +383,19 @@ template<>
> >> VERIFY(m.stride(2) == 1);
> >> }
> >>
> >> +template<>
> >> + constexpr void
> >> + test_stride_3d<std::layout_stride>()
> >> + {
> >> + std::dextents<int, 3> exts(3, 5, 7);
> >> + std::array<int, 3> strides{11, 2, 41};
> >> + std::layout_stride::mapping<std::dextents<int, 3>> m(exts,
> strides);
> >> + VERIFY(m.stride(0) == strides[0]);
> >> + VERIFY(m.stride(1) == strides[1]);
> >> + VERIFY(m.stride(2) == strides[2]);
> >> + VERIFY(m.strides() == strides);
> >> + }
> >> +
> >> template<typename Layout>
> >> constexpr bool
> >> test_stride_all()
> >> @@ -347,7 +417,7 @@ template<typename Layout>
> >> test_has_stride_0d()
> >> {
> >> using Mapping = typename Layout::mapping<std::extents<int>>;
> >> - constexpr bool expected = false;
> >> + constexpr bool expected = std::is_same_v<Layout,
> std::layout_stride>;
> >> static_assert(has_stride<Mapping> == expected);
> >> }
> >>
> >> @@ -488,8 +558,11 @@ main()
> >> {
> >> test_all<std::layout_left>();
> >> test_all<std::layout_right>();
> >> + test_all<std::layout_stride>();
> >>
> >> test_has_op_eq<std::layout_right, std::layout_left, false>();
> >> + test_has_op_eq<std::layout_right, std::layout_stride, true>();
> >> + test_has_op_eq<std::layout_left, std::layout_stride, true>();
> >> test_has_op_eq_peculiar();
> >> return 0;
> >> }
> >> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/layouts/stride.cc
> >> b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/stride.cc
> >> new file mode 100644
> >> index 00000000000..c8af5c61254
> >> --- /dev/null
> >> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/layouts/stride.cc
> >> @@ -0,0 +1,526 @@
> >> +// { dg-do run { target c++23 } }
> >> +#include <mdspan>
> >> +
> >> +#include <testsuite_hooks.h>
> >> +
> >> +constexpr size_t dyn = std::dynamic_extent;
> >> +
> >> +template<typename MappingStride>
> >> + constexpr void
> >> + test_ctor_default_stride()
> >> + {
> >> + using Extents = typename MappingStride::extents_type;
> >> + MappingStride actual;
> >> + typename std::layout_right::mapping<Extents> expected;
> >> +
> >> + constexpr auto rank = MappingStride::extents_type::rank();
> >> + if constexpr (rank > 0)
> >> + for(size_t i = 0; i < rank; ++i)
> >> + VERIFY(actual.stride(i) == expected.stride(i));
> >> + }
> >> +
> >> +constexpr bool
> >> +test_ctor_default_stride_all()
> >> +{
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::extents<int, 3>>>();
> >> +
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::extents<int, 3, 5, 7>>>();
> >> +
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::dextents<int, 3>>>();
> >> +
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::extents<int, 0, 5, 7>>>();
> >> +
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::extents<int, 3, dyn, dyn>>>();
> >> +
> >> + test_ctor_default_stride<
> >> + std::layout_stride::mapping<std::extents<int, dyn, dyn, 3>>>();
> >> + return true;
> >> +}
> >> +
> >> +struct IntLikeA
> >> +{
> >> + operator int()
> >> + { return 0; }
> >> +};
> >> +
> >> +struct IntLikeB
> >> +{
> >> + operator int() noexcept
> >> + { return 0; }
> >> +};
> >> +
> >> +struct NotIntLike
> >> +{ };
> >> +
> >> +template<typename E, typename E_arg, typename T, size_t N, bool
> Expected>
> >> +constexpr void
> >> +test_stride_constructible()
> >> +{
> >> + static_assert(std::is_nothrow_constructible_v<
> >> + std::layout_stride::mapping<E>, E_arg, std::span<T, N>> ==
> >> Expected);
> >> + static_assert(std::is_nothrow_constructible_v<
> >> + std::layout_stride::mapping<E>, E_arg, std::array<T, N>> ==
> >> Expected);
> >> +
> static_assert(!std::is_constructible_v<std::layout_stride::mapping<E>,
> >> + E_arg>);
> >> +}
> >> +
> >> +constexpr void
> >> +test_stride_constructible_all()
> >> +{
> >> + using E0 = std::extents<int>;
> >> + using E1 = std::extents<int, 2>;
> >> + using E2 = std::extents<int, dyn>;
> >> +
> >> + test_stride_constructible<E0, E0, int, 0, true>();
> >> + test_stride_constructible<E0, E0, IntLikeA, 0, false>();
> >> + test_stride_constructible<E0, E0, IntLikeB, 0, true>();
> >> + test_stride_constructible<E0, E0, NotIntLike, 0, false>();
> >> + test_stride_constructible<E1, E1, int, 1, true>();
> >> + test_stride_constructible<E2, E1, int, 1, true>();
> >> + test_stride_constructible<E1, E1, int, 2, false>();
> >> + test_stride_constructible<E1, E0, int, 1, false>();
> >> +}
> >> +
> >> +template<typename Extents, typename Shape>
> >> + constexpr void
> >> + test_ctor_shape_strides(Extents exts, Shape strides)
> >> + {
> >> + using M = std::layout_stride::mapping<Extents>;
> >> + M m(exts, strides);
> >> +
> >> + if constexpr (Extents::rank() > 0)
> >> + for(size_t i = 0; i < exts.rank(); ++i)
> >> + {
> >> + VERIFY(m.stride(i) == strides[i]);
> >> + VERIFY(m.extents().extent(i) == exts.extent(i));
> >> + }
> >> + }
> >> +
> >> +constexpr bool
> >> +test_ctor_shape_stride_all()
> >> +{
> >> + test_ctor_shape_strides(std::extents<int>{}, std::array<int, 0>{});
> >> + test_ctor_shape_strides(std::extents<int, 2>{}, std::array<int,
> 1>{3});
> >> + test_ctor_shape_strides(std::extents<int, 2, 4, 6>{},
> >> + std::array<int, 3>{20, 5, 45});
> >> + return true;
> >> +}
> >> +
> >> +template<typename Extents, std::array<bool, 2> Strided,
> >> + std::array<bool, 2> Unique, std::array<bool, 2> Exhautive,
> >> + typename Extents::index_type Offset = 0>
> >> + struct MappingLike
> >> + {
> >> + using extents_type = Extents;
> >> + using index_type = typename Extents::index_type;
> >> +
> >> + constexpr
> >> + MappingLike(extents_type extents,
> >> + std::array<index_type, Extents::rank()> strides)
> >> + : _extents(extents), _strides(strides)
> >> + { }
> >> +
> >> + static constexpr bool
> >> + is_always_strided() requires (Strided[0])
> >> + { return Strided[1]; }
> >> +
> >> + static constexpr bool
> >> + is_always_unique() requires (Unique[0])
> >> + { return Unique[1]; }
> >> +
> >> + static constexpr bool
> >> + is_always_exhaustive() requires (Exhautive[0])
> >> + { return Exhautive[1]; }
> >> +
> >> + constexpr Extents
> >> + extents() const { return _extents; }
> >> +
> >> + constexpr index_type
> >> + stride(size_t i) const { return _strides[i]; }
> >> +
> >> + template<typename... Indices>
> >> + constexpr index_type
> >> + operator()(Indices... indices) const
> >> + {
> >> + if (empty())
> >> + VERIFY(false);
> >> +
> >> + std::array<index_type, Extents::rank()> ind_arr{indices...};
> >> + index_type ret = Offset;
> >> + for(size_t i = 0; i < Extents::rank(); ++i)
> >> + ret += ind_arr[i]*_strides[i];
> >> + return ret;
> >> + }
> >> +
> >> + private:
> >> + constexpr bool
> >> + empty() const
> >> + {
> >> + for (size_t i = 0; i < extents_type::rank(); ++i)
> >> + if (_extents.extent(i) == 0)
> >> + return true;
> >> + return false;
> >> + }
> >> +
> >> + Extents _extents;
> >> + std::array<index_type, Extents::rank()> _strides;
> >> + };
> >> +
> >> +
> >> +template<size_t Rank>
> >> +struct ExtentLike
> >> +{
> >> + using index_type = int;
> >> +
> >> + static constexpr size_t
> >> + rank() { return Rank; }
> >> +};
> >> +
> >> +
> >> +template<typename E1>
> >> +constexpr void
> >> +test_mapping_like_constructible()
> >> +{
> >> + using M = std::layout_stride::mapping<E1>;
> >> + using E2 = std::dextents<typename E1::index_type, E1::rank()>;
> >> + using E3 = std::dextents<typename E1::index_type, E1::rank() + 1>;
> >> + using E4 = ExtentLike<E1::rank()>;
> >> +
> >> + constexpr auto TT = std::array{true, true};
> >> + constexpr auto FT = std::array{false, true};
> >> + constexpr auto TF = std::array{true, false};
> >> +
> >> + static_assert(std::is_constructible_v<M, MappingLike<E1, TT, TT,
> TT>>);
> >> + static_assert(std::is_constructible_v<M, MappingLike<E2, TT, TT,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E3, TT, TT,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E1, FT, TT,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E1, TF, TT,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E1, TT, FT,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E1, TT, TF,
> TT>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E1, TT, TT,
> FT>>);
> >> + static_assert(std::is_constructible_v<M, MappingLike<E1, TT, TT,
> TF>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E4, TT, TT,
> TF>>);
> >> + static_assert(!std::is_constructible_v<M, MappingLike<E4, TT, TT,
> TT>>);
> >> +}
> >> +
> >> +constexpr void
> >> +test_mapping_like_constructible_all()
> >> +{
> >> + test_mapping_like_constructible<std::extents<int>>();
> >> + test_mapping_like_constructible<std::extents<int, 2>>();
> >> + test_mapping_like_constructible<std::extents<int, 2, 3>>();
> >> +}
> >> +
> >> +template<typename E1, typename E2>
> >> +constexpr void
> >> +test_mapping_like_convertible()
> >> +{
> >> + using M1 = std::layout_stride::mapping<E1>;
> >> + using M2 = std::layout_stride::mapping<E2>;
> >> + constexpr auto TT = std::array{true, true};
> >> +
> >> + static_assert(!std::is_convertible_v<MappingLike<E1, TT, TT, TT>,
> M1>);
> >> + static_assert(!std::is_convertible_v<MappingLike<E2, TT, TT, TT>,
> M1>);
> >> + static_assert(!std::is_convertible_v<MappingLike<E1, TT, TT, TT>,
> M2>);
> >> +
> >> + static_assert(std::is_convertible_v<std::layout_stride::mapping<E2>,
> >> M1>);
> >> + static_assert(std::is_convertible_v<std::layout_left::mapping<E2>,
> M1>);
> >> + static_assert(std::is_convertible_v<std::layout_right::mapping<E2>,
> >> M1>);
> >> +
> >> + static_assert(!std::is_convertible_v<std::layout_stride::mapping<E1>,
> >> M2>);
> >> + static_assert(!std::is_convertible_v<std::layout_left::mapping<E1>,
> >> M2>);
> >> + static_assert(!std::is_convertible_v<std::layout_right::mapping<E1>,
> >> M2>);
> >> +}
> >> +
> >> +constexpr void
> >> +test_mapping_like_convertible_all()
> >> +{
> >> + test_mapping_like_convertible<std::extents<unsigned int>,
> >> + std::extents<int>>();
> >> + test_mapping_like_convertible<std::extents<unsigned int, 2>,
> >> + std::extents<int, 2>>();
> >> + test_mapping_like_convertible<std::extents<int, dyn, 3>,
> >> + std::extents<int, 2, 3>>();
> >> +}
> >> +
> >> +template<typename Extents>
> >> +constexpr void
> >> +test_ctor_stride_like(Extents exts, std::array<int, Extents::rank()>
> >> strides)
> >> +{
> >> + auto other_right = std::layout_right::mapping(exts);
> >> + auto other_left = std::layout_left::mapping(exts);
> >> + auto other_stride = std::layout_stride::mapping(exts, strides);
> >> +
> >> + VERIFY(std::layout_stride::mapping<Extents>(other_right) ==
> >> other_right);
> >> + VERIFY(std::layout_stride::mapping<Extents>(other_left) ==
> other_left);
> >> + VERIFY(std::layout_stride::mapping<Extents>(other_stride) ==
> >> other_stride);
> >> +}
> >> +
> >> +constexpr void
> >> +test_ctor_stride_like_all()
> >> +{
> >> + using E1 = std::extents<int>;
> >> + auto s1 = std::array<int, 0>{};
> >> + test_ctor_stride_like(E1{}, s1);
> >> +
> >> + using E2 = std::extents<int, 3>;
> >> + auto s2 = std::array<int, 1>{2};
> >> + test_ctor_stride_like(E2{}, s2);
> >> +
> >> + using E3 = std::extents<int, 3, 5, 7>;
> >> + auto s3 = std::array<int, 3>{5, 1, 15};
> >> + test_ctor_stride_like(E3{}, s3);
> >> +}
> >> +
> >> +constexpr bool
> >> +test_ctor_strides_all()
> >> +{
> >> + test_ctor_default_stride_all();
> >> + test_ctor_shape_stride_all();
> >> + test_ctor_stride_like_all();
> >> + return true;
> >> +}
> >> +
> >> +// Check is_exhaustive.
> >> +template<typename Extents, typename Strides>
> >> + constexpr void
> >> + test_is_exhaustive(Extents extents, Strides strides, bool expected)
> >> + {
> >> + std::layout_stride::mapping<Extents> m(extents, strides);
> >> + VERIFY(m.is_exhaustive() == expected);
> >> +
> >> + bool always_exhaustive = extents.rank() == 0 ||
> >> m.required_span_size() == 0;
> >> + VERIFY(m.is_always_exhaustive() == always_exhaustive);
> >> + }
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_zero_1d()
> >> +{
> >> + std::extents<int, 0> extents;
> >> + test_is_exhaustive(extents, std::array{1}, true);
> >> + test_is_exhaustive(extents, std::array{2}, true);
> >> +}
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_zero_3d()
> >> +{
> >> + std::extents<int, 3, 0, 7> extents;
> >> +
> >> + test_is_exhaustive(extents, std::array{1, 1, 1}, true);
> >> + test_is_exhaustive(extents, std::array{1, 2*21, 2*3}, true);
> >> + test_is_exhaustive(extents, std::array{7, 2*21, 1}, true);
> >> + test_is_exhaustive(extents, std::array{1, 21, 3}, true);
> >> + test_is_exhaustive(extents, std::array{7, 21, 1}, true);
> >> +}
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_0d()
> >> +{
> >> + std::extents<int> extents;
> >> + test_is_exhaustive(extents, std::array<int, 0>{}, true);
> >> +}
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_1d()
> >> +{
> >> + std::extents<int, 3> extents;
> >> + test_is_exhaustive(extents, std::array{1}, true);
> >> + test_is_exhaustive(extents, std::array{3}, false);
> >> +}
> >> +
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_3d()
> >> +{
> >> + std::extents<int, 3, dyn, 7> extents(5);
> >> +
> >> + test_is_exhaustive(extents, std::array{1, 3, 3*5}, true);
> >> + test_is_exhaustive(extents, std::array{5*7, 1, 5}, true);
> >> + test_is_exhaustive(extents, std::array{7, 3*7, 1}, true);
> >> +
> >> + test_is_exhaustive(extents, std::array{1, 3, 2*3*5}, false);
> >> + test_is_exhaustive(extents, std::array{2*5*7, 1, 2*5}, false);
> >> + test_is_exhaustive(extents, std::array{2*7, 2*3*7, 2}, false);
> >> +}
> >> +
> >> +constexpr void
> >> +test_is_exhaustive_ones()
> >> +{
> >> + std::extents<int, 1, 1, 3, 1> extents;
> >> + test_is_exhaustive(extents, std::array{1, 1, 1, 1}, true);
> >> + test_is_exhaustive(extents, std::array{1, 1, 1, 3}, true);
> >> + test_is_exhaustive(extents, std::array{3, 3, 1, 3}, true);
> >> + test_is_exhaustive(extents, std::array{3, 1, 1, 3}, true);
> >> +}
> >> +
> >> +constexpr bool
> >> +test_is_exhaustive_all()
> >> +{
> >> + test_is_exhaustive_zero_1d();
> >> + test_is_exhaustive_zero_3d();
> >> + test_is_exhaustive_ones();
> >> + test_is_exhaustive_0d();
> >> + test_is_exhaustive_1d();
> >> + test_is_exhaustive_3d();
> >> + return true;
> >> +}
> >> +
> >> +template<typename Extents, int Offset>
> >> + using OffsetMapping = MappingLike<Extents, {true, true}, {true,
> true},
> >> + {true, false}, Offset>;
> >> +
> >> +template<typename Extents>
> >> + constexpr void
> >> + test_eq(Extents exts,
> >> + std::array<typename Extents::index_type, Extents::rank()>
> >> left_strides,
> >> + std::array<typename Extents::index_type, Extents::rank()>
> >> right_strides,
> >> + std::array<typename Extents::index_type, Extents::rank()>
> >> padded_strides)
> >> + {
> >> + using DExtents = std::dextents<int, Extents::rank()>;
> >> +
> >> + std::layout_left::mapping<Extents> ml;
> >> + std::layout_right::mapping<DExtents> mr(exts);
> >> +
> >> + std::layout_stride::mapping<Extents> msd;
> >> + std::layout_stride::mapping<Extents> msl(exts, left_strides);
> >> + std::layout_stride::mapping<Extents> msr(exts, right_strides);
> >> + std::layout_stride::mapping<Extents> msp(exts, padded_strides);
> >> +
> >> + OffsetMapping<Extents, 0> mor{exts, right_strides};
> >> + OffsetMapping<Extents, 0> mol{exts, left_strides};
> >> + OffsetMapping<Extents, 0> mop{exts, padded_strides};
> >> + OffsetMapping<Extents, 1> moo{exts, right_strides};
> >> +
> >> + VERIFY(msd == mr);
> >> + VERIFY(msd == mor);
> >> + VERIFY(msd != msp);
> >> + VERIFY(msd != mop);
> >> +
> >> + VERIFY(msl == ml);
> >> + VERIFY(msl == mol);
> >> + VERIFY(msd != msp);
> >> + VERIFY(msl != mop);
> >> +
> >> + VERIFY(msp == mop);
> >> + VERIFY(msp != ml);
> >> + VERIFY(msp != mr);
> >> +
> >> + VERIFY(msd != moo);
> >> + }
> >> +
> >> +constexpr void
> >> +test_eq_0d()
> >> +{
> >> + using Extents = std::extents<int>;
> >> + Extents exts;
> >> + std::layout_left::mapping<Extents> ml;
> >> + std::layout_right::mapping<Extents> mr;
> >> + std::layout_stride::mapping<Extents> ms;
> >> + OffsetMapping<Extents, 0> mor{exts, {}};
> >> + OffsetMapping<Extents, 1> moo{exts, {}};
> >> +
> >> + VERIFY(ms == ml);
> >> + VERIFY(ms == mr);
> >> + VERIFY(ms == mor);
> >> + VERIFY(ms != moo);
> >> +}
> >> +
> >> +constexpr void
> >> +test_eq_1d()
> >> +{
> >> + using Extents = std::extents<int, 2>;
> >> + auto exhaustive_strides = std::array{1};
> >> + auto padded_strides = std::array{2};
> >> +
> >> + test_eq(Extents{}, exhaustive_strides, exhaustive_strides,
> >> padded_strides);
> >> +}
> >> +
> >> +constexpr void
> >> +test_eq_2d()
> >> +{
> >> + using Extents = std::extents<int, 1, 2>;
> >> + auto left_strides = std::array{1, 1};
> >> + auto right_strides = std::array{2, 1};
> >> + auto padded_strides = std::array{2, 8};
> >> +
> >> + test_eq(Extents{}, left_strides, right_strides, padded_strides);
> >> +}
> >> +
> >> +constexpr void
> >> +test_eq_zero()
> >> +{
> >> + using Extents = std::extents<int, 0, 2>;
> >> + using Mapping = std::layout_stride::mapping<Extents>;
> >> +
> >> + Extents exts;
> >> + std::array<int, 2> sl{1, 5};
> >> + std::array<int, 2> sr{5, 1};
> >> +
> >> + Mapping m1(exts, sl);
> >> + Mapping m2(exts, sl);
> >> + Mapping m3(exts, sr);
> >> + OffsetMapping<Extents, 0> m4(exts, sl);
> >> +
> >> + VERIFY(m1 == m2);
> >> + VERIFY(m1 != m3);
> >> + VERIFY(m1 == m4);
> >> +
> >> +}
> >> +
> >> +constexpr bool
> >> +test_eq_all()
> >> +{
> >> + test_eq_0d();
> >> + test_eq_1d();
> >> + test_eq_2d();
> >> + test_eq_zero();
> >> + return true;
> >> +}
> >> +
> >> +template<typename M1, typename M2>
> >> + concept has_op_eq = requires (M1 m1, M2 m2)
> >> + {
> >> + { m1 == m2 } -> std::same_as<bool>;
> >> + { m2 == m1 } -> std::same_as<bool>;
> >> + { m1 != m2 } -> std::same_as<bool>;
> >> + { m2 != m1 } -> std::same_as<bool>;
> >> + };
> >> +
> >> +constexpr void
> >> +test_has_op_eq()
> >> +{
> >> + using E1 = std::extents<int>;
> >> + using E2 = std::extents<int, 2>;
> >> + using E3 = std::extents<int, 1, 2>;
> >> + constexpr auto FT = std::array{false, true};
> >> +
> >> + static_assert(!has_op_eq<
> >> + std::layout_stride::mapping<E1>, MappingLike<E1, FT, FT, FT>>);
> >> +
> >> + static_assert(!has_op_eq<
> >> + std::layout_stride::mapping<E2>, MappingLike<E2, FT, FT, FT>>);
> >> +
> >> + static_assert(!has_op_eq<
> >> + std::layout_stride::mapping<E3>, MappingLike<E3, FT, FT, FT>>);
> >> +}
> >> +
> >> +int
> >> +main()
> >> +{
> >> + test_ctor_strides_all();
> >> + static_assert(test_ctor_strides_all());
> >> + test_mapping_like_convertible_all();
> >> + test_mapping_like_constructible_all();
> >> + test_stride_constructible_all();
> >> + test_is_exhaustive_all();
> >> + static_assert(test_is_exhaustive_all());
> >> + test_eq_all();
> >> + static_assert(test_eq_all());
> >> + test_has_op_eq();
> >> + return 0;
> >> +}
> >> --
> >> 2.49.0
> >>
> >>
> >
>
>
