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/assign.cc: New test.
* testsuite/23_containers/mdspan/extents/class_properties.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_ints.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_all_extents.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_dynamic_extents.cc:
New test.
* testsuite/23_containers/mdspan/extents/custom_integer.cc: New test.
* testsuite/23_containers/mdspan/extents/deduction_guide.cc: New test.
* testsuite/23_containers/mdspan/extents/dextents.cc: New test.
* testsuite/23_containers/mdspan/extents/extent.cc: New test.
* testsuite/23_containers/mdspan/extents/ops_eq.cc: New test.
Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
---
.../23_containers/mdspan/extents/assign.cc | 29 ++++++
.../mdspan/extents/class_properties.cc | 62 +++++++++++++
.../23_containers/mdspan/extents/ctor_copy.cc | 75 +++++++++++++++
.../mdspan/extents/ctor_copy_constexpr.cc | 20 ++++
.../23_containers/mdspan/extents/ctor_ints.cc | 58 ++++++++++++
.../mdspan/extents/ctor_ints_constexpr.cc | 12 +++
.../mdspan/extents/ctor_shape_all_extents.cc | 61 +++++++++++++
.../mdspan/extents/ctor_shape_constexpr.cc | 23 +++++
.../extents/ctor_shape_dynamic_extents.cc | 91 +++++++++++++++++++
.../mdspan/extents/custom_integer.cc | 87 ++++++++++++++++++
.../mdspan/extents/deduction_guide.cc | 34 +++++++
.../23_containers/mdspan/extents/dextents.cc | 11 +++
.../23_containers/mdspan/extents/extent.cc | 24 +++++
.../23_containers/mdspan/extents/ops_eq.cc | 58 ++++++++++++
14 files changed, 645 insertions(+)
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/assign.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/class_properties.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_copy_constexpr.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_ints_constexpr.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_all_extents.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_dynamic_extents.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/dextents.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/extent.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ops_eq.cc
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign.cc
new file mode 100644
index 00000000000..3bc32361a7b
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign.cc
@@ -0,0 +1,29 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+static_assert(std::is_nothrow_assignable_v<std::extents<int, dyn, 2>,
+ std::extents<int, 1, 2>>);
+
+int
+main()
+{
+ 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 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_properties.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_properties.cc
new file mode 100644
index 00000000000..548900a7f44
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_properties.cc
@@ -0,0 +1,62 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+constexpr auto 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<class 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));
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..44eeab2ef22
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
@@ -0,0 +1,75 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+#include <type_traits>
+
+// 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<class T, size_t ... Extents, class Other>
+ void
+ test_ctor(const Other& other)
+ {
+ auto e = std::extents<T, Extents...>(other);
+ VERIFY(e == other);
+ }
+
+int
+main()
+{
+ 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 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_constexpr.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_constexpr.cc
new file mode 100644
index 00000000000..49fa023c354
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_constexpr.cc
@@ -0,0 +1,20 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Test that the ctor from other extents is constexpr.
+
+constexpr auto dyn = std::dynamic_extent;
+
+constexpr std::extents<int> e0;
+constexpr std::extents<int> e1 = e0;
+
+constexpr std::extents<int, 1> e2;
+constexpr std::extents<int, 1> e3 = e2;
+static_assert(e3 == e2);
+
+constexpr std::extents<int, dyn> e4 = e2;
+static_assert(e4 == e2);
+
+constexpr std::extents<int, 3, 5> e5;
+constexpr std::extents<int, dyn, 5> e6 = e5;
+static_assert(e6 == e5);
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..3b23787ca15
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc
@@ -0,0 +1,58 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+template<class Lhs, class Rhs>
+ void
+ verify(const Lhs& lhs, const Rhs& rhs)
+ { VERIFY(lhs == rhs); }
+
+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>());
+
+int
+main()
+{
+ 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 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_constexpr.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_constexpr.cc
new file mode 100644
index 00000000000..11f1520c652
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_constexpr.cc
@@ -0,0 +1,12 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+constexpr auto e0 = std::extents<int, 1, 2>(1, 2);
+constexpr auto e1 = std::extents<int, 1, dyn>(2);
+constexpr auto e3 = std::extents<int, dyn, dyn>(1, 2);
+
+constexpr auto e4 = std::extents<int, 1, 2>{1, 2};
+constexpr auto e5 = std::extents<int, 1, dyn>{2};
+constexpr auto e6 = std::extents<int, dyn, dyn>{1, 2};
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_all_extents.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_all_extents.cc
new file mode 100644
index 00000000000..78d2b22bb40
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_all_extents.cc
@@ -0,0 +1,61 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+static_assert(std::is_nothrow_constructible_v<std::extents<int, 1, 2>,
+ std::array<int, 2>>);
+static_assert(std::is_nothrow_constructible_v<std::extents<int, 1, 2>,
+ std::span<int, 2>>);
+
+// Not constructibe if the size of the shape isn't rank() or rank_dynamic().
+static_assert(!std::is_constructible_v<std::extents<int, 1, 2>,
+ std::array<int, 1>>);
+static_assert(!std::is_constructible_v<std::extents<int, dyn, dyn>,
+ std::array<int, 1>>);
+
+template<typename Lhs, typename Rhs>
+ void
+ verify(const Lhs& lhs, const Rhs& rhs)
+ { VERIFY(lhs == rhs); }
+
+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);
+
+ auto check = [](auto 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);
+ };
+
+ check(array);
+ check(span);
+ check(span_const);
+}
+
+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);
+}
+
+int
+main()
+{
+ test_common_shapes();
+ test_empty_shapes();
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc
new file mode 100644
index 00000000000..8abe069c8c6
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc
@@ -0,0 +1,23 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+constexpr auto a0 = std::array<int, 0>{};
+constexpr auto a1 = std::array<int, 1>{2};
+constexpr auto a2 = std::array<int, 2>{1, 2};
+
+constexpr auto e0 = std::extents<int, 1, 2>(a0);
+constexpr auto e1 = std::extents<int, 1, dyn>(a1);
+constexpr auto e2 = std::extents<int, 1, 2>(a2);
+constexpr auto e3 = std::extents<int, dyn, dyn>(a2);
+
+constexpr auto s0 = std::span<const int, 0>(a0);
+constexpr auto s1 = std::span<const int, 1>(a1);
+constexpr auto s2 = std::span<const int, 2>(a2);
+
+constexpr auto e4 = std::extents<int, 1, 2>(s0);
+constexpr auto e5 = std::extents<int, 1, dyn>(s1);
+constexpr auto e6 = std::extents<int, 1, 2>(s2);
+constexpr auto e7 = std::extents<int, dyn, dyn>(s2);
+
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_dynamic_extents.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_dynamic_extents.cc
new file mode 100644
index 00000000000..f02f21bbb25
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_dynamic_extents.cc
@@ -0,0 +1,91 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr size_t 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
+ 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>, 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>());
+
+template<typename Extents, typename Shape>
+ 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>
+ 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));
+ }
+
+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);
+}
+
+int
+main()
+{
+ test_common_shapes();
+ 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/deduction_guide.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide.cc
new file mode 100644
index 00000000000..974fa48febd
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide.cc
@@ -0,0 +1,34 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+constexpr auto dyn = std::dynamic_extent;
+
+constexpr auto e0 = std::extents();
+static_assert(std::is_same_v<decltype(e0), const std::dextents<size_t, 0>>);
+static_assert(e0 == std::extents<size_t>());
+
+constexpr auto e1 = std::extents(1);
+static_assert(std::is_same_v<decltype(e1), const std::dextents<size_t, 1>>);
+static_assert(e1 == std::extents<size_t, 1>());
+
+constexpr auto e2 = std::extents(1.0, 2.0f);
+static_assert(std::is_same_v<decltype(e2), const std::dextents<size_t, 2>>);
+static_assert(e2 == std::extents<size_t, 1, 2>());
+
+constexpr auto e3 = std::extents(int(1), char(2), size_t(3));
+static_assert(std::is_same_v<decltype(e3), const std::dextents<size_t, 3>>);
+static_assert(e3 == std::extents<size_t, 1, 2, 3>());
+
+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>);
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/dextents.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/dextents.cc
new file mode 100644
index 00000000000..31544373c72
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/dextents.cc
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+constexpr auto dyn = std::dynamic_extent;
+
+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>>);
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/extent.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/extent.cc
new file mode 100644
index 00000000000..1993fa31fc6
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/extent.cc
@@ -0,0 +1,24 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_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);
+
+constexpr std::extents<int, 1, 2> e0;
+static_assert(e0.extent(0) == 1 && e0.extent(1) == 2);
+
+constexpr std::extents<int, 1, dyn> e1(2);
+static_assert(e1.extent(0) == 1 && e1.extent(1) == 2);
+
+constexpr std::extents<int, 1, dyn> e2(2);
+static_assert(e2.extent(0) == 1 && e2.extent(1) == 2);
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ops_eq.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ops_eq.cc
new file mode 100644
index 00000000000..4a1b0641d9d
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ops_eq.cc
@@ -0,0 +1,58 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+template<class Lhs, class Rhs>
+ void
+ test_ops_eq(const Lhs& lhs, const Rhs& rhs, bool expected)
+ {
+ VERIFY((lhs == rhs) == expected);
+ VERIFY((lhs != rhs) == !expected);
+ }
+
+constexpr auto dyn = std::dynamic_extent;
+
+static_assert(std::extents<int, 1, 2, 3>() == std::extents<int, 1, 2, 3>());
+static_assert(std::extents<int, 1, 2, 3>() != std::extents<int, 1, 2>());
+static_assert(std::extents<int, 1, 2, 3>() == std::extents<int, 1, dyn, 3>(2));
+static_assert(std::extents<int, 1, 2, 3>() != std::extents<int, 1, dyn, 3>(3));
+
+void
+test_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);
+}
+
+void
+test_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);
+}
+
+int
+main()
+{
+ test_rank_zero();
+ test_common();
+ return 0;
+}
--
2.48.1
