Initial commit

example/example9.cpp

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+/*
+    example/example9.cpp -- Example 9: nested modules
+    and internal references
+
+    Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "example.h"
+
+void submodule_func() {
+    std::cout << "submodule_func()" << std::endl;
+}
+
+class A {
+public:
+    A(int v) : v(v) { std::cout << "A constructor" << std::endl; }
+    ~A() { std::cout << "A destructor" << std::endl; }
+    A(const A&) { std::cout << "A copy constructor" << std::endl; }
+    std::string toString() { return "A[" + std::to_string(v) + "]"; }
+private:
+    int v;
+};
+
+class B {
+public:
+    B() { std::cout << "B constructor" << std::endl; }
+    ~B() { std::cout << "B destructor" << std::endl; }
+    B(const B&) { std::cout << "B copy constructor" << std::endl; }
+    A &get_a1() { return a1; }
+    A &get_a2() { return a2; }
+
+    A a1{1};
+    A a2{2};
+};
+
+void init_ex9(py::module &m) {
+    py::module m_sub = m.def_submodule("submodule");
+    m_sub.def("submodule_func", &submodule_func);
+
+    py::class_<A>(m_sub, "A")
+        .def(py::init<int>())
+        .def("__repr__", &A::toString);
+
+    py::class_<B>(m_sub, "B")
+        .def(py::init<>())
+        .def("get_a1", &B::get_a1, "Return the internal A 1", py::return_value_policy::reference_internal)
+        .def("get_a2", &B::get_a2, "Return the internal A 2", py::return_value_policy::reference_internal)
+        .def_readwrite("a1", &B::a1)  // def_readonly uses an internal reference return policy by default
+        .def_readwrite("a2", &B::a2);
+}