[gcc r16-2095] libstdc++: Restructure mdspan tests to reuse IntLike.

[Tomasz Kaminski]

https://gcc.gnu.org/g:45b81ebf7815e3cea15f6fb18e83a101a4c50fb3

commit r16-2095-g45b81ebf7815e3cea15f6fb18e83a101a4c50fb3
Author: Luc Grosheintz <luc.grosheintz@gmail.com>
Date:   Fri Jul 4 10:29:45 2025 +0200

    libstdc++: Restructure mdspan tests to reuse IntLike.
    
    The class IntLike is used for testing extents with user-defined classes
    that convert to int. This commit places the class into a separate header
    file. This allows it to be reused across different parts of the mdspan
    related testsuite.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/23_containers/mdspan/extents/custom_integer.cc:
            Delete IntLike and include "int_like.h".
            * testsuite/23_containers/mdspan/extents/int_like.h: Add
            IntLike.
    
    Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
    Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>

Diff:
---
 .../23_containers/mdspan/extents/custom_integer.cc | 27 +------------------
 .../23_containers/mdspan/extents/int_like.h        | 30 ++++++++++++++++++++++
 2 files changed, 31 insertions(+), 26 deletions(-)

diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc b/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
index 2907ad12ae72..404755bd5ac4 100644
--- a/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc
@@ -2,38 +2,13 @@
 #include <mdspan>
 
 #include <testsuite_hooks.h>
+#include "int_like.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>);
 
diff --git a/libstdc++-v3/testsuite/23_containers/mdspan/extents/int_like.h b/libstdc++-v3/testsuite/23_containers/mdspan/extents/int_like.h
new file mode 100644
index 000000000000..f39f4cc90816
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/mdspan/extents/int_like.h
@@ -0,0 +1,30 @@
+#ifndef TEST_MDSPAN_INT_LIKE_H
+#define TEST_MDSPAN_INT_LIKE_H
+
+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;
+};
+
+#endif // TEST_MDSPAN_INT_LIKE_H