From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/boost/libs/python/test/back_reference.cpp | 112 ++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 src/boost/libs/python/test/back_reference.cpp

(limited to 'src/boost/libs/python/test/back_reference.cpp')

diff --git a/src/boost/libs/python/test/back_reference.cpp b/src/boost/libs/python/test/back_reference.cpp
new file mode 100644
index 000000000..266ed2912
--- /dev/null
+++ b/src/boost/libs/python/test/back_reference.cpp
@@ -0,0 +1,112 @@
+// Copyright David Abrahams 2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#include <boost/python/class.hpp>
+#include <boost/python/module.hpp>
+#include <boost/python/def.hpp>
+#include <boost/python/has_back_reference.hpp>
+#include <boost/python/back_reference.hpp>
+#include <boost/ref.hpp>
+#include <boost/utility.hpp>
+#include <memory>
+#define BOOST_ENABLE_ASSERT_HANDLER
+#include <boost/assert.hpp>
+#include <boost/python/copy_const_reference.hpp>
+#include <boost/python/return_value_policy.hpp>
+#include <boost/mpl/bool.hpp>
+
+// This test shows that a class can be wrapped "as itself" but also
+// acquire a back-reference iff has_back_reference<> is appropriately
+// specialized.
+using namespace boost::python;
+
+struct X
+{
+    explicit X(int x) : x(x), magic(7654321) { ++counter; }
+    X(X const& rhs) : x(rhs.x), magic(7654321) { ++counter; }
+    virtual ~X() { BOOST_ASSERT(magic == 7654321); magic = 6666666; x = 9999; --counter; }
+
+    void set(int _x) { BOOST_ASSERT(magic == 7654321); this->x = _x; }
+    int value() const { BOOST_ASSERT(magic == 7654321); return x; }
+    static int count() { return counter; }
+ private:
+    void operator=(X const&);
+ private:
+    int x;
+    long magic;
+    static int counter;
+};
+
+int X::counter;
+
+struct Y : X
+{
+    Y(PyObject* self, int x) : X(x), self(self) {}
+    Y(PyObject* self, Y const& rhs) : X(rhs), self(self) {}
+ private:
+    Y(Y const&);
+    PyObject* self;
+};
+
+struct Z : X
+{
+    Z(PyObject* self, int x) : X(x), self(self) {}
+    Z(PyObject* self, Z const& rhs) : X(rhs), self(self) {}
+ private:
+    Z(Z const&);
+    PyObject* self;
+};
+
+Y const& copy_Y(Y const& y) { return y; }
+Z const& copy_Z(Z const& z) { return z; }
+
+namespace boost { namespace python
+{
+  template <>
+  struct has_back_reference<Y>
+      : mpl::true_
+  {
+  };
+
+  template <>
+  struct has_back_reference<Z>
+      : mpl::true_
+  {
+  };
+}}
+
+// prove that back_references get initialized with the right PyObject*
+object y_identity(back_reference<Y const&> y)
+{
+    return y.source();
+}
+
+// prove that back_references contain the right value
+bool y_equality(back_reference<Y const&> y1, Y const& y2)
+{
+    return &y1.get() == &y2;
+}
+
+BOOST_PYTHON_MODULE(back_reference_ext)
+{
+    def("copy_Y", copy_Y, return_value_policy<copy_const_reference>());
+    def("copy_Z", copy_Z, return_value_policy<copy_const_reference>());
+    def("x_instances", &X::count);
+    
+    class_<Y>("Y", init<int>())
+        .def("value", &Y::value)
+        .def("set", &Y::set)
+        ;
+
+    class_<Z,std::auto_ptr<Z> >("Z", init<int>())
+        .def("value", &Z::value)
+        .def("set", &Z::set)
+        ;
+
+    def("y_identity", y_identity);
+    def("y_equality", y_equality);
+
+}
+
+#include "module_tail.cpp"
-- 
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