pybind11/tests/test_builtin_casters.cpp

26     std::wstring wstr;
33     m.def("good_utf8_string", []() { return std::string(u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
34     m.def("good_utf16_string", [=]() { return std::u16string({ b16, ib16, cake16_1, cake16_2, mathbfA16_1, mathbfA16_2, z16 }); }); // b‽🎂𝐀z
35     m.def("good_utf32_string", [=]() { return std::u32string({ a32, mathbfA32, cake32, ib32, z32 }); }); // a𝐀🎂‽z
37     m.def("bad_utf8_string", []()  { return std::string("abc\xd0" "def"); });
38     m.def("bad_utf16_string", [=]() { return std::u16string({ b16, char16_t(0xd800), z16 }); });
41         m.def("bad_utf32_string", [=]() { return std::u32string({ a32, char32_t(0xd800), z32 }); });
43         m.def("bad_wchar_string", [=]() { return std::wstring({ wchar_t(0x61), wchar_t(0xd800) }); });
61     m.def("string_length", [](std::string s) { return s.length(); });
66     m.def("string_view_print",   [](std::string_view s)    { py::print(s, s.size()); });
67     m.def("string_view16_print", [](std::u16string_view s) { py::print(s, s.size()); });
68     m.def("string_view32_print", [](std::u32string_view s) { py::print(s, s.size()); });
69     m.def("string_view_chars",   [](std::string_view s)    { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; });
70     m.def("string_view16_chars", [](std::u16string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
71     m.def("string_view32_chars", [](std::u32string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
72     m.def("string_view_return",   []() { return std::string_view(u8"utf8 secret \U0001f382"); });
73     m.def("string_view16_return", []() { return std::u16string_view(u"utf16 secret \U0001f382"); });
74     m.def("string_view32_return", []() { return std::u32string_view(U"utf32 secret \U0001f382"); });
78     m.def("i32_str", [](std::int32_t v) { return std::to_string(v); });
79     m.def("u32_str", [](std::uint32_t v) { return std::to_string(v); });
80     m.def("i64_str", [](std::int64_t v) { return std::to_string(v); });
81     m.def("u64_str", [](std::uint64_t v) { return std::to_string(v); });
84     m.def("pair_passthrough", [](std::pair<bool, std::string> input) {
85         return std::make_pair(input.second, input.first);
87     m.def("tuple_passthrough", [](std::tuple<bool, std::string, int> input) {
88         return std::make_tuple(std::get<2>(input), std::get<1>(input), std::get<0>(input));
90     m.def("empty_tuple", []() { return std::tuple<>(); });
91     static std::pair<RValueCaster, RValueCaster> lvpair;
92     static std::tuple<RValueCaster, RValueCaster, RValueCaster> lvtuple;
93     static std::pair<RValueCaster, std::tuple<RValueCaster, std::pair<RValueCaster, RValueCaster>>> lvnested;
94     m.def("rvalue_pair", []() { return std::make_pair(RValueCaster{}, RValueCaster{}); });
96     m.def("rvalue_tuple", []() { return std::make_tuple(RValueCaster{}, RValueCaster{}, RValueCaster{}); });
99         return std::make_pair(RValueCaster{}, std::make_tuple(RValueCaster{}, std::make_pair(RValueCaster{}, RValueCaster{}))); });
103     m.def("return_none_string", []() -> std::string * { return nullptr; });
118     m.def("load_nullptr_t", [](std::nullptr_t) {}); // not useful, but it should still compile
119     m.def("cast_nullptr_t", []() { return std::nullptr_t{}; });
126     m.def("refwrap_builtin", [](std::reference_wrapper<int> p) { return 10 * p.get(); });
127     m.def("refwrap_usertype", [](std::reference_wrapper<UserType> p) { return p.get().value(); });
128     // Not currently supported (std::pair caster has return-by-value cast operator);
130     //m.def("refwrap_pair", [](std::reference_wrapper<std::pair<int, int>>) { });
135         for (auto &f : {std::ref(x1), std::ref(x2)}) {
145         l.append(f(std::ref(w)));
146         l.append(f(std::cref(w)));
148         l.append(f(std::ref(x)));
150         auto r3 = std::ref(y);
157     m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); });