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[SVN r9551]
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@@ -1,80 +0,0 @@
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/*
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This example shows how to make an Extension Class "pickleable".
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For more information refer to boost/libs/python/doc/pickle.html.
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*/
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#include <string>
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#include <boost/python/class_builder.hpp>
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namespace python = boost::python;
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namespace { // Avoid cluttering the global namespace.
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// A friendly class.
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class world
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{
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public:
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world(const std::string& country) : secret_number(0) {
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this->country = country;
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}
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std::string greet() const { return "Hello from " + country + "!"; }
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std::string get_country() const { return country; }
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void set_secret_number(int number) { secret_number = number; }
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int get_secret_number() const { return secret_number; }
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private:
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std::string country;
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int secret_number;
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};
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// Support for pickle.
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python::ref world_getinitargs(const world& w) {
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python::tuple result(1);
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result.set_item(0, w.get_country());
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return result.reference(); // returning the reference avoids the copying.
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}
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python::ref world_getstate(const world& w) {
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python::tuple result(1);
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result.set_item(0, w.get_secret_number());
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return result.reference(); // returning the reference avoids the copying.
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}
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void world_setstate(world& w, python::tuple state) {
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if (state.size() != 1) {
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PyErr_SetString(PyExc_ValueError,
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"Unexpected argument in call to __setstate__.");
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throw python::error_already_set();
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}
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int number = state[0].get<int>();
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if (number != 42)
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w.set_secret_number(number);
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}
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}
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BOOST_PYTHON_MODULE_INIT(pickle2)
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{
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try
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{
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// Create an object representing this extension module.
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python::module_builder this_module("pickle2");
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// Create the Python type object for our extension class.
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python::class_builder<world> world_class(this_module, "world");
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// Add the __init__ function.
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world_class.def(python::constructor<std::string>());
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// Add a regular member function.
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world_class.def(&world::greet, "greet");
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world_class.def(&world::get_secret_number, "get_secret_number");
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world_class.def(&world::set_secret_number, "set_secret_number");
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// Support for pickle.
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world_class.def(world_getinitargs, "__getinitargs__");
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world_class.def(world_getstate, "__getstate__");
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world_class.def(world_setstate, "__setstate__");
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}
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catch(...)
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{
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python::handle_exception(); // Deal with the exception for Python
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}
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}
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