pybind11/example/example2.cpp

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/*
example/example2.cpp2 -- singleton design pattern, static functions and
variables, passing and interacting with Python types
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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"
#include <pybind11/stl.h>
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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 Python set */
py::set get_set() {
py::set set;
set.add(py::str("key1"));
set.add(py::str("key2"));
return set;
}
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/* 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 and return a C++ set */
std::set<std::string> get_set_2() {
std::set<std::string> result;
result.insert("key1");
result.insert("key2");
return result;
}
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/* 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;
}
/* Easily iterate over a set using a C++11 range-based for loop */
void print_set(py::set set) {
for (auto item : set)
std::cout << "key: " << item << std::endl;
}
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/* 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 (such as maps) 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;
}
/* STL data types (such as sets) are automatically casted from Python */
void print_set_2(const std::set<std::string> &set) {
for (auto item : set)
std::cout << "key: " << item << std::endl;
}
/* STL data types (such as vectors) are automatically casted from Python */
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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 */
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py::class_<Example2>(m, "Example2", "Example 2 documentation")
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.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("get_set", &Example2::get_set, "Return a Python set")
.def("get_set2", &Example2::get_set, "Return a C++ set")
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.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_set", &Example2::print_set, "Print entries of a Python set")
.def("print_set_2", &Example2::print_set_2, "Print entries of a C++ set")
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.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)");
}