working boost::python example

Author: rhaschke

tests/CMakeLists.txt

@@ -257,3 +257,9 @@ add_subdirectory(test_embed)
 
 # Test CMake build using functions and targets from subdirectory or installed location
 add_subdirectory(test_cmake_build)
+
+find_package(Boost REQUIRED COMPONENTS python${PYTHON_VERSION_MAJOR})
+add_library(test_move_arg_bp SHARED test_move_arg_bp.cpp)
+target_include_directories(test_move_arg_bp PRIVATE ${PYTHON_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS})
+target_link_libraries(test_move_arg_bp ${Boost_LIBRARIES} ${PYTHON_LIBRARIES})
+set_target_properties(test_move_arg_bp PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${testdir} PREFIX "")

tests/test_move_arg_bp.cpp

@@ -0,0 +1,37 @@
+#include "test_move_arg.h"
+#include <boost/python.hpp>
+#include <sstream>
+
+namespace py = boost::python;
+
+std::string item_repr(const Item& item) {
+	std::stringstream ss;
+	ss << "py " << item;
+	return ss.str();
+}
+
+void item_access(const Item& item) {
+	std::cout << "access " << item << "\n";
+}
+
+void item_access_ptr(const std::auto_ptr<Item>& item) {
+	std::cout << "access ptr " << item.get() << " ";
+	if (item.get()) std::cout << *item;
+	std::cout << "\n";
+}
+
+void item_consume(std::auto_ptr<Item>& item) {
+	std::cout << "consume " << *item << "\n  ";
+	Item sink(std::move(*item.release()));
+	std::cout << "  old: " << item.get() << "\n  new: " << sink << "\n";
+}
+
+BOOST_PYTHON_MODULE(test_move_arg_bp) {
+	py::class_<Item, std::auto_ptr<Item>, boost::noncopyable>("Item", py::init<int>())
+		.def("__repr__", &item_repr);
+
+	py::def("access", item_access);
+	py::def("access_ptr", item_access_ptr);
+
+	py::def("consume", item_consume);
+}

tests/test_move_arg_bp.py

@@ -0,0 +1,27 @@
+import pytest
+from test_move_arg_bp import Item, access, access_ptr, consume
+
+
+def test():
+    item = Item(42)
+    other = item
+    print(item)
+    access(item)
+    consume(item)
+    print("back in python")
+
+    try:
+        access_ptr(item)
+        access(item)
+    except Exception as e:
+        print(e)
+
+    del item
+
+    try:
+        print(other)
+    except Exception as e:
+        print(e)
+
+if __name__ == "__main__":
+    test()