On Fri, Apr 18, 2025 at 1:37 PM Luc Grosheintz <luc.groshei...@gmail.com>
wrote:
> A prior commit added std::extents, this commit adds the tests. The bulk
> is focussed on testing the constructors. These are split into three
> groups:
>
> 1. the ctor from other extents and the copy ctor,
> 2. the ctor from a pack of integer-like objects,
> 3. the ctor from shapes, i.e. span and array.
>
> For each group check that the ctor:
> * produces an object with the expected values for extent,
> * is implicit if and only if required,
> * is constexpr,
> * doesn't change the rank of the extent.
>
> libstdc++-v3/ChangeLog:
>
> * testsuite/23_containers/mdspan/extents/class_mandates_neg.cc:
> New test.
> * testsuite/23_containers/mdspan/extents/ctor_copy.cc: New test.
> * testsuite/23_containers/mdspan/extents/ctor_ints.cc: New test.
> * testsuite/23_containers/mdspan/extents/ctor_shape.cc: New test.
> * testsuite/23_containers/mdspan/extents/custom_integer.cc: New
> test.
> * testsuite/23_containers/mdspan/extents/misc.cc: New test.
>
> Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
>
---
>
LGTM
> .../mdspan/extents/class_mandates_neg.cc | 8 +
> .../23_containers/mdspan/extents/ctor_copy.cc | 82 +++++++
> .../23_containers/mdspan/extents/ctor_ints.cc | 62 +++++
> .../mdspan/extents/ctor_shape.cc | 160 +++++++++++++
> .../mdspan/extents/custom_integer.cc | 87 +++++++
> .../23_containers/mdspan/extents/misc.cc | 223 ++++++++++++++++++
> 6 files changed, 622 insertions(+)
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/class_mandates_neg.cc
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape.cc
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
> create mode 100644
> libstdc++-v3/testsuite/23_containers/mdspan/extents/misc.cc
>
> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_mandates_neg.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_mandates_neg.cc
> new file mode 100644
> index 00000000000..bbb3e0ad144
> --- /dev/null
> +++
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_mandates_neg.cc
> @@ -0,0 +1,8 @@
> +// { dg-do compile { target c++23 } }
> +#include<mdspan>
> +
> +std::extents<std::int32_t, size_t(1) << 32> e1; // { dg-error "from here"
> }
> +std::extents<double, 1> e2; // { dg-error "from here"
> }
> +// { dg-prune-output "dynamic or representable as _IndexType" }
> +// { dg-prune-output "must be integral" }
> +// { dg-prune-output "invalid use of incomplete type" }
> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
> new file mode 100644
> index 00000000000..a7b3a169301
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
> @@ -0,0 +1,82 @@
> +// { dg-do run { target c++23 } }
> +#include <mdspan>
> +
> +#include <testsuite_hooks.h>
> +
> +// Test the copy ctor and the ctor from other extents.
> +
> +constexpr auto dyn = std::dynamic_extent;
> +
> +// Not constructible
> +static_assert(!std::is_constructible_v<std::extents<int>,
> + std::extents<int, 1>>);
> +
> +static_assert(!std::is_constructible_v<std::extents<int, 1, 1>,
> + std::extents<int, 1>>);
> +
> +static_assert(!std::is_constructible_v<std::extents<int, dyn>,
> + std::extents<int, dyn, dyn>>);
> +
> +static_assert(!std::is_constructible_v<std::extents<int, 2, 2>,
> + std::extents<int, 1, 2>>);
> +
> +// Nothrow constructible
> +static_assert(std::is_nothrow_constructible_v<std::extents<int, 1>,
> + std::extents<unsigned int,
> dyn>>);
> +static_assert(std::is_nothrow_constructible_v<std::extents<unsigned int,
> dyn>,
> + std::extents<int, 1>>);
> +
> +// Implicit conversion
> +static_assert(!std::is_convertible_v<std::extents<unsigned int>,
> + std::extents<int>>);
> +static_assert(std::is_convertible_v<std::extents<int>,
> + std::extents<unsigned int>>);
> +
> +static_assert(!std::is_convertible_v<std::extents<unsigned int, 1>,
> + std::extents<int, 1>>);
> +static_assert(std::is_convertible_v<std::extents<int, 1>,
> + std::extents<unsigned int, 1>>);
> +
> +static_assert(!std::is_convertible_v<std::extents<int, dyn>,
> + std::extents<int, 1>>);
> +static_assert(std::is_convertible_v<std::extents<int, 1>,
> + std::extents<int, dyn>>);
> +
> +static_assert(!std::is_convertible_v<std::extents<unsigned int, 1>,
> + std::extents<int, dyn>>);
> +static_assert(std::is_convertible_v<std::extents<int, 1>,
> + std::extents<unsigned int, dyn>>);
> +
> +template<typename T, size_t... Extents, typename Other>
> + constexpr void
> + test_ctor(const Other& other)
> + {
> + auto e = std::extents<T, Extents...>(other);
> + VERIFY(e == other);
> + }
> +
> +constexpr int
> +test_all()
> +{
> + auto e0 = std::extents<int>();
> + test_ctor<int>(e0);
> +
> + auto e1 = std::extents<int, 1, 2, 3>();
> + test_ctor<int, 1, 2, 3>(e1);
> + test_ctor<int, 1, dyn, 3>(e1);
> + test_ctor<unsigned int, 1, dyn, 3>(e1);
> +
> + auto e2 = std::extents<unsigned int, 1, dyn, 3>{1, 2, 3};
> + test_ctor<int, 1, 2, 3>(e2);
> + test_ctor<int, 1, dyn, 3>(e2);
> + test_ctor<int, 1, dyn, dyn>(e2);
> + return true;
> +}
> +
> +int
> +main()
> +{
> + test_all();
> + static_assert(test_all());
> + return 0;
> +}
> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc
> new file mode 100644
> index 00000000000..53cf14d9bc5
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc
> @@ -0,0 +1,62 @@
> +// { dg-do run { target c++23 } }
> +#include <mdspan>
> +
> +#include <testsuite_hooks.h>
> +
> +constexpr auto dyn = std::dynamic_extent;
> +
> +class A {};
> +
> +// Not constructible if the number of integer-like arguments isn't either
> +// rank() or rank_dynamic().
> +static_assert(!std::is_constructible_v<std::extents<int>, int>);
> +static_assert(!std::is_constructible_v<std::extents<int, dyn, dyn>, int>);
> +static_assert(!std::is_constructible_v<std::extents<int, 1, dyn, 3>, int,
> int>);
> +
> +// Not constructible from non integer-like objects.
> +static_assert(!std::is_constructible_v<std::extents<int, 1>, int, A>);
> +
> +// No implicit conversion from integer-like objects.
> +template<typename Extent, typename... OExtents>
> + constexpr bool
> + is_explicit()
> + {
> + return std::is_nothrow_constructible_v<Extent, OExtents...>
> + && !std::is_convertible_v<Extent, OExtents...>;
> + }
> +
> +static_assert(is_explicit<std::extents<int, 1>, int>());
> +static_assert(is_explicit<std::extents<int, 1>, unsigned int>());
> +static_assert(is_explicit<std::extents<unsigned int, 1>, int>());
> +
> +constexpr bool
> +test_all()
> +{
> + auto expected = std::extents<int, 1, 2, 3>(1, 2, 3);
> +
> + // From all extents.
> + VERIFY((std::extents<int, 1, 2, 3>(1, 2, 3)) == expected);
> + VERIFY((std::extents<int, dyn, 2, 3>(1, 2, 3)) == expected);
> + VERIFY((std::extents<int, dyn, 2, dyn>(1, 2, 3)) == expected);
> +
> + VERIFY((std::extents<int, 1, 2, 3>{1, 2, 3}) == expected);
> + VERIFY((std::extents<int, dyn, 2, 3>{1, 2, 3}) == expected);
> + VERIFY((std::extents<int, dyn, 2, dyn>{1, 2, 3}) == expected);
> +
> + // From only dynamic extents.
> + VERIFY((std::extents<int, dyn, 2, 3>(1)) == expected);
> + VERIFY((std::extents<int, dyn, 2, dyn>(1, 3)) == expected);
> +
> + VERIFY((std::extents<int, dyn, 2, 3>{1}) == expected);
> + VERIFY((std::extents<int, dyn, 2, dyn>{1, 3}) == expected);
> +
> + return true;
> +}
> +
> +int
> +main()
> +{
> + test_all();
> + static_assert(test_all);
> + return 0;
> +}
> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape.cc
> new file mode 100644
> index 00000000000..72e06df42ce
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape.cc
> @@ -0,0 +1,160 @@
> +// { dg-do run { target c++23 } }
> +#include <mdspan>
> +
> +#include <testsuite_hooks.h>
> +
> +constexpr auto dyn = std::dynamic_extent;
> +
> +template<typename Extent, typename T, size_t N>
> + constexpr bool
> + constructible()
> + {
> + return std::is_nothrow_constructible_v<Extent, std::array<T, N>>
> + && std::is_nothrow_constructible_v<Extent, std::span<T, N>>;
> + }
> +
> +template<typename Extent, typename T, size_t N>
> + constexpr bool
> + not_constructible()
> + {
> + return !std::is_constructible_v<Extent, std::array<T, N>>
> + && !std::is_constructible_v<Extent, std::span<T, N>>;
> + }
> +
> +template<typename Extent, typename T, size_t N>
> + constexpr bool
> + convertible()
> + {
> + return std::is_convertible_v<std::array<T, N>, Extent>
> + && std::is_convertible_v<std::span<T, N>, Extent>;
> + }
> +
> +template<typename Extent, typename T, size_t N>
> + constexpr bool
> + not_convertible()
> + {
> + return !std::is_convertible_v<std::array<T, N>, Extent>
> + && !std::is_convertible_v<std::span<T, N>, Extent>;
> + }
> +
> +static_assert(constructible<std::extents<int, 1, 2>, int, 2>);
> +static_assert(not_constructible<std::extents<int, 1, 2>, int, 1>);
> +
> +static_assert(constructible<std::extents<int>, int, 0>());
> +static_assert(convertible<std::extents<int>, int, 0>());
> +static_assert(convertible<std::extents<unsigned int>, int, 0>());
> +static_assert(convertible<std::extents<int>, unsigned int, 0>());
> +
> +static_assert(constructible<std::extents<int, 1, dyn>, int, 1>());
> +static_assert(convertible<std::extents<int, 1, dyn>, int, 1>());
> +static_assert(convertible<std::extents<unsigned int, 1, dyn>, int, 1>());
> +static_assert(convertible<std::extents<int, 1, dyn>, unsigned int, 1>());
> +
> +static_assert(constructible<std::extents<int, 1, dyn>, int, 2>());
> +static_assert(not_convertible<std::extents<int, 1, dyn>, int, 2>());
> +static_assert(not_convertible<std::extents<unsigned int, 1, dyn>, int,
> 2>());
> +static_assert(not_convertible<std::extents<int, 1, dyn>, unsigned int,
> 2>());
> +
> +// Non-integer, but convertible.
> +static_assert(constructible<std::extents<int, dyn>, double, 1>());
> +static_assert(convertible<std::extents<int, dyn>, double, 1>());
> +
> +namespace all_extents
> +{
> + template<typename Shape>
> + constexpr void
> + test_ctor(Shape shape)
> + {
> + auto expected = std::extents<int, 1, 2, 3>();
> + VERIFY((std::extents<int, 1, dyn, 3>(shape)) == expected);
> + VERIFY((std::extents<int, dyn, dyn, dyn>(shape)) == expected);
> + VERIFY((std::extents<int, 1, 2, 3>(shape)) == expected);
> + }
> +
> + constexpr void
> + test_common_shapes()
> + {
> + auto array = std::array<int, 3>{1, 2, 3};
> + auto span_const = std::span<const int, 3>(array);
> + auto span = std::span<int, 3>(array);
> +
> + test_ctor(array);
> + test_ctor(span);
> + test_ctor(span_const);
> + }
> +
> + constexpr void
> + test_empty_shapes()
> + {
> + auto shape = std::array<int, 0>();
> + auto span = std::span<int, 0>(shape);
> +
> + auto expected = std::extents<int>();
> + VERIFY((std::extents<int>(shape)) == expected);
> + VERIFY((std::extents<int>(span)) == expected);
> + }
> +
> + constexpr bool
> + test_all()
> + {
> + test_common_shapes();
> + test_empty_shapes();
> + return true;
> + }
> +}
> +
> +namespace only_dynamic_extents
> +{
> + template<typename Extents, typename Shape>
> + constexpr void
> + test_ctor(const Shape& shape)
> + {
> + Extents e = shape;
> +
> + VERIFY(e.rank_dynamic() == shape.size());
> +
> + size_t di = 0;
> + for(size_t i = 0; i < e.rank(); ++i)
> + if(e.static_extent(i) == dyn)
> + VERIFY(e.extent(i) == shape[di++]);
> + }
> +
> + template<typename Extents, typename T, size_t N>
> + constexpr void
> + test_all_shape_types(std::array<T, N> shape)
> + {
> + test_ctor<Extents>(shape);
> + test_ctor<Extents>(std::span<T, N>(shape));
> + test_ctor<Extents>(std::span<const T, N>(shape));
> + }
> +
> + constexpr void
> + test_common_shapes()
> + {
> + auto s = std::array<int, 0>{};
> + auto s2 = std::array<int, 1>{2};
> + auto s123 = std::array<int, 3>{1, 2, 3};
> +
> + test_all_shape_types<std::extents<int, 1, dyn, 3>>(s2);
> + test_all_shape_types<std::extents<int, dyn, dyn, dyn>>(s123);
> + test_all_shape_types<std::extents<int, 1, 2, 3>>(s);
> + }
> +
> + constexpr bool
> + test_all()
> + {
> + test_common_shapes();
> + return true;
> + }
> +}
> +
> +int
> +main()
> +{
> + all_extents::test_all();
> + static_assert(all_extents::test_all());
> +
> + only_dynamic_extents::test_all();
> + static_assert(only_dynamic_extents::test_all());
> + return 0;
> +}
> diff --git
> a/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
> new file mode 100644
> index 00000000000..2907ad12ae7
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
> @@ -0,0 +1,87 @@
> +// { dg-do run { target c++23 } }
> +#include <mdspan>
> +
> +#include <testsuite_hooks.h>
> +
> +// Test construction from a custom integer-like object, that has
> +// no copy/move ctor or copy/move assignment operator.
> +
> +constexpr size_t dyn = std::dynamic_extent;
> +
> +class IntLike
> +{
> +public:
> + explicit
> + IntLike(int i)
> + : _M_i(i)
> + { }
> +
> + IntLike() = delete;
> + IntLike(const IntLike&) = delete;
> + IntLike(IntLike&&) = delete;
> +
> + const IntLike&
> + operator=(const IntLike&) = delete;
> +
> + const IntLike&
> + operator=(IntLike&&) = delete;
> +
> + constexpr
> + operator int() const noexcept
> + { return _M_i; }
> +
> +private:
> + int _M_i;
> +};
> +
> +static_assert(std::is_convertible_v<IntLike, int>);
> +static_assert(std::is_nothrow_constructible_v<int, IntLike>);
> +
> +void
> +test_shape(const auto& s2, const auto& s23)
> +{
> + std::extents<int, 2, 3> expected;
> +
> + std::extents<int, 2, 3> e1(s23);
> + VERIFY(e1 == expected);
> +
> + std::extents<int, dyn, 3> e2(s2);
> + VERIFY(e2 == expected);
> +
> + std::extents<int, dyn, 3> e3(s23);
> + VERIFY(e3 == expected);
> +
> + std::extents<int, dyn, dyn> e4(s23);
> + VERIFY(e4 == expected);
> +}
> +
> +void
> +test_pack()
> +{
> + std::extents<int, 2, 3> expected;
> +
> + std::extents<int, dyn, 3> e1(IntLike(2));
> + VERIFY(e1 == expected);
> +
> + std::extents<int, dyn, 3> e2(IntLike(2), IntLike(3));
> + VERIFY(e2 == expected);
> +
> + std::extents<int, dyn, dyn> e3(IntLike(2), IntLike(3));
> + VERIFY(e3 == expected);
> +}
> +
> +int
> +main()
> +{
> + auto a2 = std::array<IntLike, 1>{IntLike(2)};
> + auto s2 = std::span<IntLike, 1>(a2);
> +
> + auto a23 = std::array<IntLike, 2>{IntLike(2), IntLike(3)};
> + auto s23 = std::span<IntLike, 2>(a23);
> +
> + test_shape(a2, a23);
> + test_shape(s2, s23);
> + test_pack();
> +
> + return 0;
> +}
> diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/misc.cc
> b/libstdc++-v3/testsuite/23_containers/mdspan/extents/misc.cc
> new file mode 100644
> index 00000000000..98c47ce7892
> --- /dev/null
> +++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/misc.cc
> @@ -0,0 +1,223 @@
> +// { dg-do run { target c++23 } }
> +#include <mdspan>
> +
> +#include <testsuite_hooks.h>
> +
> +constexpr size_t dyn = std::dynamic_extent;
> +
> +// Check class traits.
> +static_assert(std::regular<std::extents<int>>);
> +static_assert(std::regular<std::extents<int, 1>>);
> +static_assert(std::regular<std::extents<int, dyn>>);
> +
> +static_assert(std::is_trivially_copyable_v<std::extents<int>>);
> +static_assert(std::is_trivially_copyable_v<std::extents<int, 1>>);
> +static_assert(std::is_trivially_copyable_v<std::extents<int, dyn>>);
> +
> +// Check member typedefs.
> +static_assert(std::is_same_v<std::extents<int, 1, 2>::rank_type, size_t>);
> +
> +static_assert(std::is_unsigned_v<std::extents<int, 2>::size_type>);
> +static_assert(std::is_unsigned_v<std::extents<unsigned int,
> 2>::size_type>);
> +
> +static_assert(std::is_same_v<std::extents<char, 2>::index_type, char>);
> +static_assert(std::is_same_v<std::extents<int, 2>::index_type, int>);
> +static_assert(std::is_same_v<std::extents<unsigned int, 2>::index_type,
> + unsigned int>);
> +
> +// Check `rank`.
> +static_assert(std::extents<int, 1>::rank() == 1);
> +static_assert(std::extents<int, dyn>::rank() == 1);
> +static_assert(std::extents<int, 2, dyn>::rank() == 2);
> +
> +// Check `rank_dynamic`.
> +static_assert(std::extents<int, 1>::rank_dynamic() == 0);
> +static_assert(std::extents<int, dyn>::rank_dynamic() == 1);
> +static_assert(std::extents<int, 2, dyn>::rank_dynamic() == 1);
> +static_assert(std::extents<int, dyn, dyn>::rank_dynamic() == 2);
> +
> +template<typename T, size_t... Extents>
> + constexpr bool
> + check_rank_return_types()
> + {
> + auto e = std::extents<T, Extents...>();
> + return std::is_same_v<decltype(e.rank()), size_t>
> + && std::is_same_v<decltype(e.rank_dynamic()), size_t>;
> + }
> +
> +static_assert(check_rank_return_types<int, 1>());
> +
> +// Check that the static extents don't take up space.
> +static_assert(sizeof(std::extents<int, 1, dyn>) == sizeof(int));
> +static_assert(sizeof(std::extents<char, 1, dyn>) == sizeof(char));
> +
> +template<typename Extents>
> +class Container
> +{
> + int dummy;
> + [[no_unique_address]] std::extents<size_t> b0;
> +};
> +
> +static_assert(sizeof(Container<std::extents<char, 1, 2>>) == sizeof(int));
> +static_assert(sizeof(Container<std::extents<size_t, 1, 2>>) ==
> sizeof(int));
> +
> +// operator=
> +static_assert(std::is_nothrow_assignable_v<std::extents<int, dyn, 2>,
> + std::extents<int, 1, 2>>);
> +
> +constexpr bool
> +test_assign()
> +{
> + auto e1 = std::extents<int, 1, 2>();
> + auto e2 = std::extents<int, 1, 2>();
> +
> + e2 = e1;
> + VERIFY(e2 == e1);
> +
> + auto e5 = std::extents<int, 1, dyn>();
> + e5 = e1;
> + VERIFY(e5 == e1);
> +
> + auto e3 = std::extents<int, dyn, dyn>(1, 2);
> + auto e4 = std::extents<int, dyn, dyn>(3, 4);
> + e3 = e4;
> + VERIFY(e3 == e4);
> + return true;
> +}
> +
> +// Deduction guide
> +template<size_t Rank, typename... Extents>
> +constexpr void
> +test_deduction(Extents... exts)
> +{
> + std::array<size_t, sizeof...(exts)> shape{static_cast<size_t>(exts)...};
> + std::dextents<size_t, Rank> expected(shape);
> + std::extents e(exts...);
> + static_assert(std::is_same_v<decltype(e), std::dextents<size_t, Rank>>);
> + VERIFY(e == expected);
> +}
> +
> +constexpr bool
> +test_deduction_all()
> +{
> + test_deduction<0>();
> + test_deduction<1>(1);
> + test_deduction<2>(1.0, 2.0f);
> + test_deduction<3>(int(1), char(2), size_t(3));
> + return true;
> +}
> +
> +class A {};
> +
> +template<typename... Extents>
> + concept deducible = requires
> + {
> + { std::extents(Extents{}...) }
> + -> std::convertible_to<std::dextents<size_t, sizeof...(Extents)>>;
> + };
> +
> +static_assert(deducible<int>);
> +static_assert(!deducible<A, A>);
> +
> +// dextents
> +static_assert(std::is_same_v<std::dextents<int, 0>, std::extents<int>>);
> +static_assert(std::is_same_v<std::dextents<int, 1>, std::extents<int,
> dyn>>);
> +static_assert(std::is_same_v<std::dextents<int, 5>,
> + std::extents<int, dyn, dyn, dyn, dyn, dyn>>);
> +
> +static_assert(std::dextents<int, 5>::rank() == 5);
> +static_assert(std::dextents<int, 5>::rank_dynamic() == 5);
> +static_assert(std::is_same_v<typename std::dextents<int, 5>::index_type,
> int>);
> +
> +// static_extent
> +static_assert(std::extents<int, 1, 2>::static_extent(0) == 1);
> +static_assert(std::extents<int, 1, 2>::static_extent(1) == 2);
> +
> +static_assert(std::extents<int, 1, dyn>::static_extent(0) == 1);
> +static_assert(std::extents<int, 1, dyn>::static_extent(1) == dyn);
> +
> +static_assert(std::extents<int, dyn, dyn>::static_extent(0) == dyn);
> +static_assert(std::extents<int, dyn, dyn>::static_extent(1) == dyn);
> +
> +// extent
> +template<typename Extent>
> + constexpr void
> + test_extent(const Extent& e, const std::array<size_t, Extent::rank()>&
> shape)
> + {
> + for(size_t i = 0; i < e.rank(); ++i)
> + VERIFY(e.extent(i) == shape[i]);
> + }
> +
> +constexpr bool
> +test_extent_all()
> +{
> + test_extent(std::extents<int, 1, 2>{}, {1, 2});
> + test_extent(std::extents<int, 1, dyn>{2}, {1, 2});
> + test_extent(std::extents<int, dyn, dyn>{1, 2}, {1, 2});
> + return true;
> +}
> +
> +// operator==
> +template<typename Lhs, typename Rhs>
> + constexpr void
> + test_ops_eq(const Lhs& lhs, const Rhs& rhs, bool expected)
> + {
> + VERIFY((lhs == rhs) == expected);
> + VERIFY((lhs != rhs) == !expected);
> + }
> +
> +constexpr void
> +test_op_eq_rank_zero()
> +{
> + auto e1 = std::extents<int>();
> + auto e2 = std::extents<int>();
> + auto e3 = std::extents<unsigned int>();
> +
> + test_ops_eq(e1, e2, true);
> + test_ops_eq(e1, e3, true);
> +}
> +
> +constexpr void
> +test_op_eq_common()
> +{
> + auto e1 = std::extents<int, 1, 2, 3>();
> + auto e2 = std::extents<int, 1, 2, 3>();
> + auto e3 = std::extents<int, 1, dyn, 3>(2);
> + auto e4 = std::extents<int, 1, dyn, 3>(3);
> +
> + auto e5 = std::extents<int, 1>();
> + auto e6 = std::extents<int, 1, 3, 3>();
> +
> + test_ops_eq(e1, e2, true);
> + test_ops_eq(e1, e3, true);
> + test_ops_eq(e1, e4, false);
> +
> + test_ops_eq(e1, e5, false);
> + test_ops_eq(e1, e6, false);
> + test_ops_eq(e3, e6, false);
> +}
> +
> +constexpr bool
> +test_op_eq_all()
> +{
> + test_op_eq_rank_zero();
> + test_op_eq_common();
> + return true;
> +}
> +
> +int
> +main()
> +{
> + test_assign();
> + static_assert(test_assign());
> +
> + test_deduction_all();
> + static_assert(test_deduction_all());
> +
> + test_extent_all();
> + static_assert(test_extent_all());
> +
> + test_op_eq_all();
> + static_assert(test_op_eq_all());
> + return 0;
> +}
> --
> 2.49.0
>
>
