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Example signatures (old => new): foo(int) => foo(arg0: int) bar(Object, int) => bar(self: Object, arg0: int) The change makes the signatures uniform for named and unnamed arguments and it helps static analysis tools reconstruct function signatures from docstrings. This also tweaks the signature whitespace style to better conform to PEP 8 for annotations and default arguments: " : " => ": " " = " => "="
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*
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example/example-arg-keywords-and-defaults.cpp -- keyword arguments and default values
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Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "example.h"
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#include <pybind11/stl.h>
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void kw_func(int x, int y) { std::cout << "kw_func(x=" << x << ", y=" << y << ")" << std::endl; }
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void kw_func4(const std::vector<int> &entries) {
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std::cout << "kw_func4: ";
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for (int i : entries)
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std::cout << i << " ";
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std::cout << endl;
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}
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py::object call_kw_func(py::function f) {
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py::tuple args = py::make_tuple(1234);
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py::dict kwargs;
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kwargs["y"] = py::cast(5678);
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return f(*args, **kwargs);
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}
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void args_function(py::args args) {
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for (size_t it=0; it<args.size(); ++it)
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std::cout << "got argument: " << py::object(args[it]) << std::endl;
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}
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void args_kwargs_function(py::args args, py::kwargs kwargs) {
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for (auto item : args)
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std::cout << "got argument: " << item << std::endl;
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if (kwargs) {
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for (auto item : kwargs)
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std::cout << "got keyword argument: " << item.first << " -> " << item.second << std::endl;
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}
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}
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struct KWClass {
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void foo(int, float) {}
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};
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void init_ex_arg_keywords_and_defaults(py::module &m) {
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m.def("kw_func0", &kw_func);
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m.def("kw_func1", &kw_func, py::arg("x"), py::arg("y"));
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m.def("kw_func2", &kw_func, py::arg("x") = 100, py::arg("y") = 200);
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m.def("kw_func3", [](const char *) { }, py::arg("data") = std::string("Hello world!"));
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/* A fancier default argument */
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std::vector<int> list;
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list.push_back(13);
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list.push_back(17);
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m.def("kw_func4", &kw_func4, py::arg("myList") = list);
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m.def("call_kw_func", &call_kw_func);
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m.def("args_function", &args_function);
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m.def("args_kwargs_function", &args_kwargs_function);
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using namespace py::literals;
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m.def("kw_func_udl", &kw_func, "x"_a, "y"_a=300);
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m.def("kw_func_udl_z", &kw_func, "x"_a, "y"_a=0);
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py::class_<KWClass>(m, "KWClass")
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.def("foo0", &KWClass::foo)
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.def("foo1", &KWClass::foo, "x"_a, "y"_a);
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}
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