From a25021d215d3801f5c671ccdaa299d4f18bac161 Mon Sep 17 00:00:00 2001
From: Dave Abrahams <dave@boostpro.com>
Date: Fri, 8 Mar 2002 15:32:32 +0000
Subject: [PATCH] Initial checkin

[SVN r13137]
---
 .../converter/rvalue_from_python_chain.hpp    | 39 ++++++++++
 test/callbacks.cpp                            | 71 +++++++++++++++++++
 test/callbacks.py                             | 43 +++++++++++
 3 files changed, 153 insertions(+)
 create mode 100644 include/boost/python/converter/rvalue_from_python_chain.hpp
 create mode 100644 test/callbacks.cpp
 create mode 100644 test/callbacks.py

diff --git a/include/boost/python/converter/rvalue_from_python_chain.hpp b/include/boost/python/converter/rvalue_from_python_chain.hpp
new file mode 100644
index 00000000..c57ef564
--- /dev/null
+++ b/include/boost/python/converter/rvalue_from_python_chain.hpp
@@ -0,0 +1,39 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#ifndef RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP
+# define RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP
+# include <boost/python/converter/registry.hpp>
+# include <boost/type_traits/transform_traits.hpp>
+# include <boost/type_traits/cv_traits.hpp>
+
+namespace boost { namespace python { namespace converter { 
+
+namespace detail
+{
+  template <class T>
+  struct rvalue_from_python_chain_impl
+  {
+      static rvalue_from_python_registration*const& value;
+  };
+
+  template <class T>
+  rvalue_from_python_registration*const& rvalue_from_python_chain_impl<T>::value
+      = registry::rvalue_converters(undecorated_type_id<T>());
+}
+
+template <class T>
+struct rvalue_from_python_chain
+    : detail::rvalue_from_python_chain_impl<
+        typename add_reference<
+          typename add_cv<T>::type
+        >::type
+      >
+{
+};
+
+}}} // namespace boost::python::converter
+
+#endif // RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP
diff --git a/test/callbacks.cpp b/test/callbacks.cpp
new file mode 100644
index 00000000..9991e41f
--- /dev/null
+++ b/test/callbacks.cpp
@@ -0,0 +1,71 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#include <boost/python/module.hpp>
+#include <boost/python/returning.hpp>
+#include <boost/python/class.hpp>
+#include <boost/ref.hpp>
+
+using namespace boost::python;
+
+int apply_int_int(PyObject* f, int x)
+{
+    return returning<int>::call(f, x);
+}
+
+void apply_void_int(PyObject* f, int x)
+{
+    returning<void>::call(f, x);
+}
+
+struct X
+{
+    explicit X(int x) : x(x), magic(7654321) { ++counter; }
+    X(X const& rhs) : x(rhs.x), magic(7654321) { ++counter; }
+    ~X() { assert(magic == 7654321); magic = 6666666; x = 9999; --counter; }
+
+    void set(int x) { assert(magic == 7654321); this->x = x; }
+    int value() const { assert(magic == 7654321); return x; }
+    static int count() { return counter; }
+ private:
+    void operator=(X const&);
+ private:
+    int x;
+    long magic;
+    static int counter;
+};
+
+X apply_X_X(PyObject* f, X x)
+{
+    return returning<X>::call(f, x);
+}
+
+void apply_void_X_ref(PyObject* f, X x)
+{
+    returning<X>::call(f, boost::ref(x));
+}
+
+int X::counter;
+
+BOOST_PYTHON_MODULE_INIT(callbacks_ext)
+{
+    boost::python::module("callbacks_ext")
+        .def("apply_int_int", apply_int_int)
+        .def("apply_void_int", apply_void_int)
+        .def("apply_X_X", apply_X_X)
+        .def("apply_void_X_ref", apply_void_X_ref)
+        .add(
+            class_<X>("X")
+            .def_init(args<int>())
+            .def_init(args<X const&>())
+            .def("value", &X::value)
+            .def("set", &X::set)
+            )
+        .def("x_count", &X::count)
+        ;
+}
+
+
+
diff --git a/test/callbacks.py b/test/callbacks.py
new file mode 100644
index 00000000..16c5be94
--- /dev/null
+++ b/test/callbacks.py
@@ -0,0 +1,43 @@
+'''
+>>> from callbacks_ext import *
+
+>>> def double(x):
+...     return x + x
+...
+>>> apply_int_int(double, 42)
+84
+>>> apply_void_int(double, 42)
+
+>>> def identity(x):
+...     return x
+
+>>> x = apply_X_X(identity, X(42))
+>>> x.value()
+42
+>>> x_count()
+1
+>>> del x
+>>> x_count()
+0
+
+>>> def increment(x):
+...     x.set(x.value() + 1)
+...
+>>> x = X(42)
+>>> apply_void_X_ref(increment, x)
+>>> x.value()
+43
+'''
+
+def run(args = None):
+    import sys
+    import doctest
+
+    if args is not None:
+        sys.argv = args
+    return doctest.testmod(sys.modules.get(__name__))
+    
+if __name__ == '__main__':
+    print "running..."
+    import sys
+    sys.exit(run()[0])