A prior commit added std::extents, this commits 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_copy.cc: New test.
* testsuite/23_containers/mdspan/extents/assign_copy_01_neg.cc: New
test.
* testsuite/23_containers/mdspan/extents/class_traits.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_01_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_02_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_copy_implicit_00.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_copy_implicit_01.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_copy_implicit_02_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_implicit_03_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_copy_implicit_04_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_00.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_01.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_02_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_03_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_ints_implicit_00_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_ints_implicit_01_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_00.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_01.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_02_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_03_neg.cc: New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_constexpr.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_implicit_00.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_implicit_01.cc: New
test.
* testsuite/23_containers/mdspan/extents/ctor_shape_implicit_02_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_implicit_03_neg.cc:
New test.
* testsuite/23_containers/mdspan/extents/ctor_shape_implicit_04.cc: New
test.
* testsuite/23_containers/mdspan/extents/custom_integer.cc: New test.
* testsuite/23_containers/mdspan/extents/deduction_guide_00.cc: New
test.
* testsuite/23_containers/mdspan/extents/deduction_guide_01_neg.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/index_type.cc: New test.
* testsuite/23_containers/mdspan/extents/ops_eq.cc: New test.
* testsuite/23_containers/mdspan/extents/rank.cc: New test.
* testsuite/23_containers/mdspan/extents/rank_dynamic.cc: New test.
* testsuite/23_containers/mdspan/extents/rank_return_type.cc: New test.
* testsuite/23_containers/mdspan/extents/rank_type.cc: New test.
* testsuite/23_containers/mdspan/extents/size_type.cc: New test.
* testsuite/23_containers/mdspan/extents/sizeof.cc: New test.
* testsuite/23_containers/mdspan/extents/static_extent.cc: New test.
Signed-off-by: Luc Grosheintz <luc.groshei...@gmail.com>
---
.../mdspan/extents/assign_copy.cc | 26 ++++++
.../mdspan/extents/assign_copy_01_neg.cc | 15 ++++
.../mdspan/extents/class_traits.cc | 20 +++++
.../23_containers/mdspan/extents/ctor_copy.cc | 34 ++++++++
.../mdspan/extents/ctor_copy_01_neg.cc | 10 +++
.../mdspan/extents/ctor_copy_02_neg.cc | 10 +++
.../mdspan/extents/ctor_copy_constexpr.cc | 20 +++++
.../mdspan/extents/ctor_copy_implicit_00.cc | 28 ++++++
.../mdspan/extents/ctor_copy_implicit_01.cc | 22 +++++
.../extents/ctor_copy_implicit_02_neg.cc | 10 +++
.../extents/ctor_copy_implicit_03_neg.cc | 9 ++
.../extents/ctor_copy_implicit_04_neg.cc | 9 ++
.../mdspan/extents/ctor_ints_00.cc | 30 +++++++
.../mdspan/extents/ctor_ints_01.cc | 24 ++++++
.../mdspan/extents/ctor_ints_02_neg.cc | 9 ++
.../mdspan/extents/ctor_ints_03_neg.cc | 9 ++
.../mdspan/extents/ctor_ints_constexpr.cc | 12 +++
.../extents/ctor_ints_implicit_00_neg.cc | 9 ++
.../extents/ctor_ints_implicit_01_neg.cc | 9 ++
.../mdspan/extents/ctor_shape_00.cc | 35 ++++++++
.../mdspan/extents/ctor_shape_01.cc | 17 ++++
.../mdspan/extents/ctor_shape_02_neg.cc | 10 +++
.../mdspan/extents/ctor_shape_03_neg.cc | 11 +++
.../mdspan/extents/ctor_shape_constexpr.cc | 23 +++++
.../mdspan/extents/ctor_shape_implicit_00.cc | 42 +++++++++
.../mdspan/extents/ctor_shape_implicit_01.cc | 19 ++++
.../extents/ctor_shape_implicit_02_neg.cc | 11 +++
.../extents/ctor_shape_implicit_03_neg.cc | 12 +++
.../mdspan/extents/ctor_shape_implicit_04.cc | 24 ++++++
.../mdspan/extents/custom_integer.cc | 86 +++++++++++++++++++
.../mdspan/extents/deduction_guide_00.cc | 23 +++++
.../mdspan/extents/deduction_guide_01_neg.cc | 10 +++
.../23_containers/mdspan/extents/dextents.cc | 11 +++
.../23_containers/mdspan/extents/extent.cc | 27 ++++++
.../mdspan/extents/index_type.cc | 14 +++
.../23_containers/mdspan/extents/ops_eq.cc | 58 +++++++++++++
.../23_containers/mdspan/extents/rank.cc | 10 +++
.../mdspan/extents/rank_dynamic.cc | 11 +++
.../mdspan/extents/rank_return_type.cc | 14 +++
.../23_containers/mdspan/extents/rank_type.cc | 7 ++
.../23_containers/mdspan/extents/size_type.cc | 16 ++++
.../23_containers/mdspan/extents/sizeof.cc | 10 +++
.../mdspan/extents/static_extent.cc | 15 ++++
43 files changed, 831 insertions(+)
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy_01_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/class_traits.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_01_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_02_neg.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_copy_implicit_00.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_01.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_02_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_03_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_04_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_00.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_01.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_02_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_03_neg.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_ints_implicit_00_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_01_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_00.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_01.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_02_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_03_neg.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_implicit_00.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_01.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_02_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_03_neg.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_04.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_00.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_01_neg.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/index_type.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/ops_eq.cc
create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/rank.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_dynamic.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_return_type.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_type.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/size_type.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/sizeof.cc
create mode 100644
libstdc++-v3/testsuite/23_containers/mdspan/extents/static_extent.cc
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy.cc
new file mode 100644
index 00000000000..ba7e495a817
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy.cc
@@ -0,0 +1,26 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+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/assign_copy_01_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy_01_neg.cc
new file mode 100644
index 00000000000..8a514f2207b
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/assign_copy_01_neg.cc
@@ -0,0 +1,15 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+void
+test_assigment()
+{
+ auto e1 = std::extents<int, 1, 2>();
+ auto e2 = std::extents<int, 1, dyn>();
+
+ e1 = e2;
+}
+
+// { dg-error "no match for 'operator=" "" { target *-*-* } 12 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_traits.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_traits.cc
new file mode 100644
index 00000000000..ae6ea988a1a
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/class_traits.cc
@@ -0,0 +1,20 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+template <std::regular T>
+ struct is_regular
+ {
+ static constexpr bool value = true;
+ };
+
+constexpr auto dyn = std::dynamic_extent;
+
+static_assert(is_regular<std::extents<int>>::value);
+static_assert(is_regular<std::extents<int, 1>>::value);
+static_assert(is_regular<std::extents<int, dyn>>::value);
+
+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>>);
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..02cd1444e3f
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc
@@ -0,0 +1,34 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+// Test that ctor from other extents creates an object from that's equal to the
+// original.
+
+constexpr auto dyn = std::dynamic_extent;
+
+template<class T, size_t ... Extents, class Other>
+ void
+ test_copy_ctor_explicit(const Other& other)
+ {
+ auto e = std::extents<T, Extents...>(other);
+ VERIFY(e == other);
+ }
+
+int
+main()
+{
+ auto e0 = std::extents<int>();
+ test_copy_ctor_explicit<int>(e0);
+
+ auto e1 = std::extents<int, 1, 2, 3>();
+ test_copy_ctor_explicit<int, 1, 2, 3>(e1);
+ test_copy_ctor_explicit<int, 1, dyn, 3>(e1);
+
+ auto e2 = std::extents<int, 1, dyn, 3>{1, 2, 3};
+ test_copy_ctor_explicit<int, 1, 2, 3>(e2);
+ test_copy_ctor_explicit<int, 1, dyn, 3>(e2);
+ test_copy_ctor_explicit<int, 1, dyn, dyn>(e2);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_01_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_01_neg.cc
new file mode 100644
index 00000000000..8a859924e6a
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_01_neg.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check Self::rank != Other::rank
+
+constexpr auto dyn = std::dynamic_extent;
+std::extents<int, 1, dyn> e1;
+std::extents<int, 1, dyn, 3> e2(e1);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 8 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_02_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_02_neg.cc
new file mode 100644
index 00000000000..51fab74ccbd
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_02_neg.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check when static extents differ.
+
+constexpr auto dyn = std::dynamic_extent;
+std::extents<int, 1, dyn> e1;
+std::extents<int, 2, dyn> e2(e1);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 8 }
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_copy_implicit_00.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_00.cc
new file mode 100644
index 00000000000..1c8b0b9f011
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_00.cc
@@ -0,0 +1,28 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+// Test that implicit conversion is permitted if the extents can't be
+// incompatible.
+int
+main()
+{
+ constexpr auto dyn = std::dynamic_extent;
+
+ auto e1 = std::extents<int, 1, 2, 3>();
+ std::extents<int, 1, 2, 3> e2 = e1;
+ VERIFY(e1 == e2);
+
+ auto shape = std::array<int, 3>{1, 2, 3};
+ auto e3 = std::extents<int, 1, dyn, 3>(shape);
+ std::extents<int, 1, dyn, 3> e4 = e3;
+ VERIFY(e4 == e3);
+
+ std::extents<int, 1, dyn, dyn> e5 = e3;
+ VERIFY(e5 == e3);
+
+ std::extents<unsigned int, 1, dyn, 3> e6 = e1;
+ VERIFY(e6 == e1);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_01.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_01.cc
new file mode 100644
index 00000000000..13c082be729
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_01.cc
@@ -0,0 +1,22 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+// Test that implicit conversion is permitted if overflow isn't possible.
+int
+main()
+{
+ constexpr auto dyn = std::dynamic_extent;
+
+ auto e0 = std::extents<int>();
+ std::extents<unsigned int> e1 = e0;
+
+ auto e3 = std::extents<int, 1, 2, 3>();
+ std::extents<unsigned int, 1, 2, 3> e4 = e3;
+ VERIFY(e4 == e3);
+
+ std::extents<unsigned int, 1, dyn, 3> e5 = e3;
+ VERIFY(e5 == e3);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_02_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_02_neg.cc
new file mode 100644
index 00000000000..ed570f6a10f
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_02_neg.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Implicit conversion must not happen when a static extent in self is dynamic
+// in other.
+
+constexpr auto e1 = std::extents<int, 1, std::dynamic_extent, 3>();
+std::extents<int, 1, 2, 3> e2 = e1;
+
+// { dg-error "conversion from 'extents" "" { target *-*-* } 8 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_03_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_03_neg.cc
new file mode 100644
index 00000000000..66b60e38bf1
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_03_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Implicit conversion must not when overflow is possible.
+
+std::extents<unsigned int, 1, 2, 3> e1;
+std::extents<int, 1, 2, 3> e2 = e1;
+
+// { dg-error "conversion from 'extents" "" { target *-*-* } 7 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_04_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_04_neg.cc
new file mode 100644
index 00000000000..dbf3f7e679a
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy_implicit_04_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// No implicit conversion because of the IndexType.
+
+std::extents<unsigned int> e1;
+std::extents<int> e2 = e1;
+
+// { dg-error "conversion from 'extents" "" { target *-*-* } 7 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_00.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_00.cc
new file mode 100644
index 00000000000..1d7739e6240
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_00.cc
@@ -0,0 +1,30 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+template<class IndexType, size_t ... Extents, class Array>
+ void
+ test_ctor_ints_00(const std::extents<IndexType, Extents...>& e,
+ const Array& shape)
+ {
+ for(size_t i = 0; i < sizeof...(Extents); ++i)
+ VERIFY(e.extent(i) == shape[i]);
+ }
+
+int
+main()
+{
+ auto shape = std::array<int, 3>{1, 2, 3};
+
+ test_ctor_ints_00(std::extents<int, 1, 2, 3>(1, 2, 3), shape);
+ test_ctor_ints_00(std::extents<int, dyn, 2, 3>(1, 2, 3), shape);
+ test_ctor_ints_00(std::extents<int, dyn, 2, dyn>(1, 2, 3), shape);
+
+ test_ctor_ints_00(std::extents<int, 1, 2, 3>{1, 2, 3}, shape);
+ test_ctor_ints_00(std::extents<int, dyn, 2, 3>{1, 2, 3}, shape);
+ test_ctor_ints_00(std::extents<int, dyn, 2, dyn>{1, 2, 3}, shape);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_01.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_01.cc
new file mode 100644
index 00000000000..86baf5b5800
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_01.cc
@@ -0,0 +1,24 @@
+// { 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); }
+
+int
+main()
+{
+ auto expected = std::extents<int, 1, 2, 3>();
+
+ 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_02_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_02_neg.cc
new file mode 100644
index 00000000000..e8605c1a980
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_02_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check N != rank && N != rank_dynamic
+
+constexpr auto dyn = std::dynamic_extent;
+std::extents<int, 1, dyn, 3> e1(1, 3);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 7 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_03_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_03_neg.cc
new file mode 100644
index 00000000000..9c3ea800283
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_03_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check N != rank && N != rank_dynamic
+
+constexpr auto dyn = std::dynamic_extent;
+std::extents<int, dyn, dyn> e1(1);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 7 }
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_ints_implicit_00_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_00_neg.cc
new file mode 100644
index 00000000000..d7713fd2bda
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_00_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Implicit conversion must not happen, via the ctor from
+// int-like objects.
+
+std::extents<int, 1> e = 1;
+
+// { dg-error "conversion from 'int'" "" { target *-*-* } 7 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_01_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_01_neg.cc
new file mode 100644
index 00000000000..e18e56b430f
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints_implicit_01_neg.cc
@@ -0,0 +1,9 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Implicit conversion must not happen, via the ctor from
+// int-like objects.
+
+std::extents<int, std::dynamic_extent> e = 1;
+
+// { dg-error "conversion from 'int'" "" { target *-*-* } 7 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_00.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_00.cc
new file mode 100644
index 00000000000..3fd726517fb
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_00.cc
@@ -0,0 +1,35 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+template<typename Lhs, typename Rhs>
+ void
+ verify(const Lhs& lhs, const Rhs& rhs)
+ { VERIFY(lhs == rhs); }
+
+int
+main()
+{
+ auto shape = std::array<int, 3>{1, 2, 3};
+ auto span_const = std::span<const int, 3>(shape);
+ auto span = std::span<int, 3>(shape);
+
+ auto expected = std::extents<int, 1, 2, 3>();
+
+ verify(std::extents<int, dyn, 2, 3>(shape), expected);
+ 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);
+
+ verify(std::extents<int, 1, dyn, 3>(span_const), expected);
+ verify(std::extents<int, dyn, dyn, dyn>(span_const), expected);
+ verify(std::extents<int, 1, 2, 3>(span_const), expected);
+
+ verify(std::extents<int, 1, dyn, 3>(span), expected);
+ verify(std::extents<int, dyn, dyn, dyn>(span), expected);
+ verify(std::extents<int, 1, 2, 3>(span), expected);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_01.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_01.cc
new file mode 100644
index 00000000000..086ad471a72
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_01.cc
@@ -0,0 +1,17 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+int
+main()
+{
+ auto e1 = std::extents<int>();
+ auto e2 = std::extents<unsigned int>();
+
+ VERIFY(e1 == e1);
+ VERIFY(e1 == e2);
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_02_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_02_neg.cc
new file mode 100644
index 00000000000..8566cf2eeb2
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_02_neg.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check N != rank && N != rank_dynamic
+
+auto s = std::array<int, 1>{};
+
+std::extents<int, 1, 2> e1(s);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 8 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_03_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_03_neg.cc
new file mode 100644
index 00000000000..94d75597ae6
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_03_neg.cc
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Check N != rank && N != rank_dynamic
+
+constexpr auto dyn = std::dynamic_extent;
+
+auto s = std::array<int, 1>{};
+std::extents<int, dyn, dyn> e1(s);
+
+// { dg-error "no matching function for call" "" { target *-*-* } 9 }
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_implicit_00.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_00.cc
new file mode 100644
index 00000000000..427d03d6379
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_00.cc
@@ -0,0 +1,42 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+// Test construction from an shape (array or span) of exclusively
+// dynamic extents.
+
+constexpr size_t dyn = std::dynamic_extent;
+
+template<class IndexType, size_t ... Extents, class Shape>
+ void
+ test_ctor_from_dynamic_extents(const Shape& shape)
+ {
+ std::extents<IndexType, Extents...> e = shape;
+
+ VERIFY(e.rank_dynamic() == shape.size());
+
+ size_t di = 0;
+ for(size_t i = 0; i < sizeof...(Extents); ++i)
+ if(e.static_extent(i) == dyn)
+ VERIFY(e.extent(i) == shape[di++]);
+ }
+
+int
+main()
+{
+ auto sxxx = std::array<int, 0>{};
+ auto sx2x = std::array<int, 1>{2};
+ auto s123 = std::array<int, 3>{1, 2, 3};
+
+ test_ctor_from_dynamic_extents<int, 1, dyn>(sx2x);
+
+ test_ctor_from_dynamic_extents<int, 1, dyn, 3>(sx2x);
+ test_ctor_from_dynamic_extents<int, dyn, dyn, dyn>(s123);
+ test_ctor_from_dynamic_extents<int, 1, 2, 3>(sxxx);
+
+ test_ctor_from_dynamic_extents<int, 1, dyn, 3>(std::span<int, 1>(sx2x));
+ test_ctor_from_dynamic_extents<int, dyn, dyn, dyn>(std::span<int, 3>(s123));
+ test_ctor_from_dynamic_extents<int, 1, 2, 3>(std::span<int, 0>(sxxx));
+ return 0;
+}
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_01.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_01.cc
new file mode 100644
index 00000000000..c0d24ea9015
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_01.cc
@@ -0,0 +1,19 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+// Test implicit conversion for convertible integer types.
+
+constexpr size_t dyn = std::dynamic_extent;
+
+auto a0 = std::array<int, 0>{};
+std::extents<int> e0 = a0;
+std::extents<unsigned int> e1 = a0;
+
+auto a1 = std::array<int, 1>{2};
+std::extents<int, 1, dyn, 3> e2 = a1;
+std::extents<unsigned int, 1, dyn, 3> e3 = a1;
+
+auto a2 = std::array<unsigned int, 1>{2};
+std::extents<int, 1, dyn, 3> e4 = a2;
+std::extents<unsigned int, 1, dyn, 3> e5 = a2;
+
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_02_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_02_neg.cc
new file mode 100644
index 00000000000..76cd9d05a8d
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_02_neg.cc
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+#include <memory>
+
+// Implicit conversion must not happen when the span contains at least one
+// static extent.
+
+auto s = std::array<int, 3>{1, 2, 3};
+std::extents<int, 1, std::dynamic_extent, 3> e = s;
+
+// { dg-error "conversion from 'std::array" "" { target *-*-* } 9 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_03_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_03_neg.cc
new file mode 100644
index 00000000000..8bffa799cec
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_03_neg.cc
@@ -0,0 +1,12 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+#include <memory>
+
+// Implicit conversion must not happen when the span contains at least one
+// static extent.
+
+auto a = std::array<int, 3>{1, 2, 3};
+auto s = std::span<int, 3>(a);
+std::extents<int, 1, std::dynamic_extent, 3> e = s;
+
+// { dg-error "conversion from 'std::span" "" { target *-*-* } 10 }
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_04.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_04.cc
new file mode 100644
index 00000000000..4a8da4aaeb7
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape_implicit_04.cc
@@ -0,0 +1,24 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+// Implicit conversion from shapes requires the constraint: convertible and the
+// pre-condition: non-negative & representable, e.g. the follwing seems to be
+// intended to work.
+
+int
+main()
+{
+ auto a = std::array<double, 1>{2.0};
+ auto s = std::span<double, 1>(a);
+
+ std::extents<int, 1, 2> expected;
+
+ std::extents<int, 1, std::dynamic_extent> e1 = a;
+ VERIFY(e1 == expected);
+
+ std::extents<int, 1, std::dynamic_extent> e2 = s;
+ VERIFY(e2 == expected);
+ 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..aae23a73af3
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
@@ -0,0 +1,86 @@
+// { 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:
+ 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>{2};
+ auto s2 = std::span<IntLike, 1>(a2);
+
+ auto a23 = std::array<IntLike, 2>{2, 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_00.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_00.cc
new file mode 100644
index 00000000000..d7f3a51b9f3
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_00.cc
@@ -0,0 +1,23 @@
+// { 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>());
+
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_01_neg.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_01_neg.cc
new file mode 100644
index 00000000000..d276634279c
--- /dev/null
+++
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/deduction_guide_01_neg.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+struct A
+{ };
+
+constexpr auto e0 = std::extents(A{});
+
+// { dg-error "no matching function for call" "" { target *-*-* } 7 }
+// { dg-error "class template argument deduction failed" "" { target *-*-* } 7
}
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..41886cabd19
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/extent.cc
@@ -0,0 +1,27 @@
+// { dg-do run { target c++23 } }
+#include <mdspan>
+
+#include <testsuite_hooks.h>
+
+constexpr auto dyn = std::dynamic_extent;
+
+template<typename IndexType, size_t... Extents>
+ void
+ test_extent(const std::extents<IndexType, Extents...>& e)
+ {
+ VERIFY(e.extent(0) == 1);
+ VERIFY(e.extent(1) == 2);
+ }
+
+int
+main()
+{
+ auto e1 = std::extents<int, 1, 2>();
+ auto e2 = std::extents<int, 1, dyn>(e1);
+ auto e3 = std::extents<int, dyn, dyn>(e1);
+
+ test_extent(e1);
+ test_extent(e2);
+ test_extent(e3);
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/index_type.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/index_type.cc
new file mode 100644
index 00000000000..96c412779ae
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/index_type.cc
@@ -0,0 +1,14 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+template<typename T>
+ constexpr bool
+ index_type_is_identity()
+ {
+ return std::is_same_v<typename std::extents<T, 1, 2, 3>::index_type, T>;
+ }
+
+static_assert(index_type_is_identity<int>());
+static_assert(index_type_is_identity<unsigned int>());
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;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank.cc
new file mode 100644
index 00000000000..0836a965396
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+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);
+
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_dynamic.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_dynamic.cc
new file mode 100644
index 00000000000..fc6bbc22618
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_dynamic.cc
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+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);
+
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_return_type.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_return_type.cc
new file mode 100644
index 00000000000..fef87359256
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_return_type.cc
@@ -0,0 +1,14 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+template<class T, size_t ... Extents>
+ constexpr bool
+ test_return_type()
+ {
+ auto e = std::extents<T, Extents...>();
+ return std::is_same_v<decltype(e.rank()), size_t>;
+ }
+
+static_assert(test_return_type<int, 1>());
+static_assert(test_return_type<int, 1, 2>());
+static_assert(test_return_type<int, 1, 3, 4>());
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_type.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_type.cc
new file mode 100644
index 00000000000..420159fff86
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/rank_type.cc
@@ -0,0 +1,7 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+static_assert(std::is_same_v<typename std::extents<int, 1, 2>::rank_type,
+ size_t>);
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/size_type.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/size_type.cc
new file mode 100644
index 00000000000..1c054a1c7d2
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/size_type.cc
@@ -0,0 +1,16 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+#include <type_traits>
+
+
+template<typename T, size_t... Extents>
+ constexpr bool
+ test_size_type()
+ {
+ return std::is_unsigned_v<typename std::extents<T, Extents...>::size_type>;
+ }
+
+static_assert(test_size_type<int, 1, 2>);
+static_assert(test_size_type<unsigned int, 1, 2>);
+
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/sizeof.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/sizeof.cc
new file mode 100644
index 00000000000..27c2d5dd25f
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/sizeof.cc
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++23 } }
+#include <mdspan>
+
+constexpr auto dyn = std::dynamic_extent;
+
+static_assert(sizeof(std::extents<int, 1, 2>) == 1);
+static_assert(sizeof(std::extents<int>) == 1);
+
+static_assert(sizeof(std::extents<int, 1, dyn>) == sizeof(int));
+static_assert(sizeof(std::extents<char, 1, dyn>) == sizeof(char));
diff --git
a/libstdc++-v3/testsuite/23_containers/mdspan/extents/static_extent.cc
b/libstdc++-v3/testsuite/23_containers/mdspan/extents/static_extent.cc
new file mode 100644
index 00000000000..18b310887e1
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/static_extent.cc
@@ -0,0 +1,15 @@
+// { 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);
--
2.49.0
