Initial commit

example/example2.cpp

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+/*
+    example/example2.cpp2 -- Example 2: singleton design pattern, static
+    functions and variables, passing and interacting with Python types
+
+    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"
+
+class Example2 {
+public:
+    static Example2 *new_instance() {
+        return new Example2();
+    }
+    ~Example2() {
+        std::cout << "Destructing Example2" << std::endl;
+    }
+
+    /* Create and return a Python dictionary */
+    py::dict get_dict() {
+        py::dict dict;
+        dict[py::str("key")] = py::str("value");
+        return dict;
+    }
+
+    /* Create and return a C++ dictionary */
+    std::map<std::string, std::string> get_dict_2() {
+        std::map<std::string, std::string> result;
+        result["key"] = "value";
+        return result;
+    }
+
+    /* Create, manipulate, and return a Python list */
+    py::list get_list() {
+        py::list list;
+        list.append(py::str("value"));
+        cout << "Entry at positon 0: " << py::object(list[0]) << endl;
+        list[0] = py::str("overwritten");
+        return list;
+    }
+
+    /* C++ STL data types are automatically casted */
+    std::vector<std::string> get_list_2() {
+        std::vector<std::string> list;
+        list.push_back("value");
+        return list;
+    }
+
+    /* Easily iterate over a dictionary using a C++11 range-based for loop */
+    void print_dict(py::dict dict) {
+        for (auto item : dict)
+            std::cout << "key: " << item.first << ", value=" << item.second << std::endl;
+    }
+
+    /* STL data types are automatically casted from Python */
+    void print_dict_2(const std::map<std::string, std::string> &dict) {
+        for (auto item : dict)
+            std::cout << "key: " << item.first << ", value=" << item.second << std::endl;
+    }
+
+    /* Easily iterate over a list using a C++11 range-based for loop */
+    void print_list(py::list list) {
+        int index = 0;
+        for (auto item : list)
+            std::cout << "list item " << index++ << ": " << item << std::endl;
+    }
+
+    /* STL data types are automatically casted from Python */
+    void print_list_2(std::vector<std::string> &list) {
+        int index = 0;
+        for (auto item : list)
+            std::cout << "list item " << index++ << ": " << item << std::endl;
+    }
+
+    /* pybind automatically translates between C++11 and Python tuples */
+    std::pair<std::string, bool> pair_passthrough(std::pair<bool, std::string> input) {
+        return std::make_pair(input.second, input.first);
+    }
+
+    /* pybind automatically translates between C++11 and Python tuples */
+    std::tuple<int, std::string, bool> tuple_passthrough(std::tuple<bool, std::string, int> input) {
+        return std::make_tuple(std::get<2>(input), std::get<1>(input), std::get<0>(input));
+    }
+
+    void throw_exception() {
+        throw std::runtime_error("This exception was intentionally thrown.");
+    }
+
+    static int value;
+    static const int value2;
+};
+
+int Example2::value = 0;
+const int Example2::value2 = 5;
+
+void init_ex2(py::module &m) {
+    /* No constructor is explicitly defined below. An exception is raised when
+       trying to construct it directly from Python */
+    py::class_<Example2>(m, "Example2")
+        .def("get_dict", &Example2::get_dict, "Return a Python dictionary")
+        .def("get_dict_2", &Example2::get_dict_2, "Return a C++ dictionary")
+        .def("get_list", &Example2::get_list, "Return a Python list")
+        .def("get_list_2", &Example2::get_list_2, "Return a C++ list")
+        .def("print_dict", &Example2::print_dict, "Print entries of a Python dictionary")
+        .def("print_dict_2", &Example2::print_dict_2, "Print entries of a C++ dictionary")
+        .def("print_list", &Example2::print_list, "Print entries of a Python list")
+        .def("print_list_2", &Example2::print_list_2, "Print entries of a C++ list")
+        .def("pair_passthrough", &Example2::pair_passthrough, "Return a pair in reversed order")
+        .def("tuple_passthrough", &Example2::tuple_passthrough, "Return a triple in reversed order")
+        .def("throw_exception", &Example2::throw_exception, "Throw an exception")
+        .def_static("new_instance", &Example2::new_instance, "Return an instance")
+        .def_readwrite_static("value", &Example2::value, "Static value member")
+        .def_readonly_static("value2", &Example2::value2, "Static value member (readonly)");
+}