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Split test_python_types.cpp into builtin_casters, stl and pytypes
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Dean Moldovan
264
tests/test_pytypes.cpp
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264
tests/test_pytypes.cpp
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/*
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tests/test_pytypes.cpp -- Python type casters
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Copyright (c) 2017 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 "pybind11_tests.h"
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TEST_SUBMODULE(pytypes, m) {
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// test_list
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m.def("get_list", []() {
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py::list list;
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list.append("value");
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py::print("Entry at position 0:", list[0]);
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list[0] = py::str("overwritten");
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return list;
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});
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m.def("print_list", [](py::list list) {
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int index = 0;
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for (auto item : list)
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py::print("list item {}: {}"_s.format(index++, item));
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});
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// test_set
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m.def("get_set", []() {
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py::set set;
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set.add(py::str("key1"));
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set.add("key2");
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set.add(std::string("key3"));
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return set;
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});
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m.def("print_set", [](py::set set) {
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for (auto item : set)
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py::print("key:", item);
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});
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// test_dict
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m.def("get_dict", []() { return py::dict("key"_a="value"); });
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m.def("print_dict", [](py::dict dict) {
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for (auto item : dict)
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py::print("key: {}, value={}"_s.format(item.first, item.second));
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});
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m.def("dict_keyword_constructor", []() {
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auto d1 = py::dict("x"_a=1, "y"_a=2);
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auto d2 = py::dict("z"_a=3, **d1);
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return d2;
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});
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// test_str
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m.def("str_from_string", []() { return py::str(std::string("baz")); });
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m.def("str_from_bytes", []() { return py::str(py::bytes("boo", 3)); });
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m.def("str_from_object", [](const py::object& obj) { return py::str(obj); });
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m.def("repr_from_object", [](const py::object& obj) { return py::repr(obj); });
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m.def("str_format", []() {
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auto s1 = "{} + {} = {}"_s.format(1, 2, 3);
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auto s2 = "{a} + {b} = {c}"_s.format("a"_a=1, "b"_a=2, "c"_a=3);
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return py::make_tuple(s1, s2);
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});
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// test_bytes
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m.def("bytes_from_string", []() { return py::bytes(std::string("foo")); });
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m.def("bytes_from_str", []() { return py::bytes(py::str("bar", 3)); });
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// test_capsule
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m.def("return_capsule_with_destructor", []() {
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py::print("creating capsule");
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return py::capsule([]() {
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py::print("destructing capsule");
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});
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});
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m.def("return_capsule_with_destructor_2", []() {
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py::print("creating capsule");
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return py::capsule((void *) 1234, [](void *ptr) {
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py::print("destructing capsule: {}"_s.format((size_t) ptr));
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});
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});
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m.def("return_capsule_with_name_and_destructor", []() {
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auto capsule = py::capsule((void *) 1234, "pointer type description", [](PyObject *ptr) {
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if (ptr) {
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auto name = PyCapsule_GetName(ptr);
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py::print("destructing capsule ({}, '{}')"_s.format(
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(size_t) PyCapsule_GetPointer(ptr, name), name
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));
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}
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});
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void *contents = capsule;
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py::print("created capsule ({}, '{}')"_s.format((size_t) contents, capsule.name()));
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return capsule;
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});
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// test_accessors
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m.def("accessor_api", [](py::object o) {
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auto d = py::dict();
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d["basic_attr"] = o.attr("basic_attr");
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auto l = py::list();
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for (const auto &item : o.attr("begin_end")) {
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l.append(item);
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}
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d["begin_end"] = l;
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d["operator[object]"] = o.attr("d")["operator[object]"_s];
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d["operator[char *]"] = o.attr("d")["operator[char *]"];
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d["attr(object)"] = o.attr("sub").attr("attr_obj");
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d["attr(char *)"] = o.attr("sub").attr("attr_char");
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try {
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o.attr("sub").attr("missing").ptr();
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} catch (const py::error_already_set &) {
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d["missing_attr_ptr"] = "raised"_s;
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}
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try {
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o.attr("missing").attr("doesn't matter");
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} catch (const py::error_already_set &) {
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d["missing_attr_chain"] = "raised"_s;
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}
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d["is_none"] = o.attr("basic_attr").is_none();
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d["operator()"] = o.attr("func")(1);
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d["operator*"] = o.attr("func")(*o.attr("begin_end"));
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return d;
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});
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m.def("tuple_accessor", [](py::tuple existing_t) {
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try {
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existing_t[0] = 1;
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} catch (const py::error_already_set &) {
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// --> Python system error
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// Only new tuples (refcount == 1) are mutable
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auto new_t = py::tuple(3);
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for (size_t i = 0; i < new_t.size(); ++i) {
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new_t[i] = i;
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}
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return new_t;
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}
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return py::tuple();
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});
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m.def("accessor_assignment", []() {
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auto l = py::list(1);
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l[0] = 0;
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auto d = py::dict();
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d["get"] = l[0];
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auto var = l[0];
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d["deferred_get"] = var;
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l[0] = 1;
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d["set"] = l[0];
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var = 99; // this assignment should not overwrite l[0]
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d["deferred_set"] = l[0];
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d["var"] = var;
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return d;
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});
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// test_constructors
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m.def("default_constructors", []() {
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return py::dict(
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"str"_a=py::str(),
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"bool"_a=py::bool_(),
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"int"_a=py::int_(),
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"float"_a=py::float_(),
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"tuple"_a=py::tuple(),
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"list"_a=py::list(),
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"dict"_a=py::dict(),
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"set"_a=py::set()
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);
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});
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m.def("converting_constructors", [](py::dict d) {
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return py::dict(
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"str"_a=py::str(d["str"]),
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"bool"_a=py::bool_(d["bool"]),
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"int"_a=py::int_(d["int"]),
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"float"_a=py::float_(d["float"]),
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"tuple"_a=py::tuple(d["tuple"]),
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"list"_a=py::list(d["list"]),
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"dict"_a=py::dict(d["dict"]),
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"set"_a=py::set(d["set"]),
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"memoryview"_a=py::memoryview(d["memoryview"])
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);
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});
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m.def("cast_functions", [](py::dict d) {
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// When converting between Python types, obj.cast<T>() should be the same as T(obj)
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return py::dict(
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"str"_a=d["str"].cast<py::str>(),
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"bool"_a=d["bool"].cast<py::bool_>(),
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"int"_a=d["int"].cast<py::int_>(),
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"float"_a=d["float"].cast<py::float_>(),
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"tuple"_a=d["tuple"].cast<py::tuple>(),
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"list"_a=d["list"].cast<py::list>(),
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"dict"_a=d["dict"].cast<py::dict>(),
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"set"_a=d["set"].cast<py::set>(),
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"memoryview"_a=d["memoryview"].cast<py::memoryview>()
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);
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});
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m.def("get_implicit_casting", []() {
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py::dict d;
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d["char*_i1"] = "abc";
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const char *c2 = "abc";
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d["char*_i2"] = c2;
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d["char*_e"] = py::cast(c2);
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d["char*_p"] = py::str(c2);
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d["int_i1"] = 42;
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int i = 42;
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d["int_i2"] = i;
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i++;
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d["int_e"] = py::cast(i);
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i++;
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d["int_p"] = py::int_(i);
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d["str_i1"] = std::string("str");
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std::string s2("str1");
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d["str_i2"] = s2;
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s2[3] = '2';
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d["str_e"] = py::cast(s2);
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s2[3] = '3';
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d["str_p"] = py::str(s2);
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py::list l(2);
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l[0] = 3;
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l[1] = py::cast(6);
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l.append(9);
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l.append(py::cast(12));
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l.append(py::int_(15));
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return py::dict(
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"d"_a=d,
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"l"_a=l
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);
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});
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// test_print
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m.def("print_function", []() {
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py::print("Hello, World!");
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py::print(1, 2.0, "three", true, std::string("-- multiple args"));
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auto args = py::make_tuple("and", "a", "custom", "separator");
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py::print("*args", *args, "sep"_a="-");
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py::print("no new line here", "end"_a=" -- ");
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py::print("next print");
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auto py_stderr = py::module::import("sys").attr("stderr");
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py::print("this goes to stderr", "file"_a=py_stderr);
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py::print("flush", "flush"_a=true);
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py::print("{a} + {b} = {c}"_s.format("a"_a="py::print", "b"_a="str.format", "c"_a="this"));
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});
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m.def("print_failure", []() { py::print(42, UnregisteredType()); });
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}
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