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/*
tests/test_builtin_casters.cpp -- Casters available without any additional headers
Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.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 "pybind11_tests.h"
#include <pybind11/complex.h>
#if defined(_MSC_VER)
# pragma warning(push)
# pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
#endif
TEST_SUBMODULE(builtin_casters, m) { // test_simple_string
m.def("string_roundtrip", [](const char *s) { return s; });
// test_unicode_conversion
// Some test characters in utf16 and utf32 encodings. The last one (the 𝐀) contains a null byte
char32_t a32 = 0x61 /*a*/, z32 = 0x7a /*z*/, ib32 = 0x203d /*‽*/, cake32 = 0x1f382 /*🎂*/, mathbfA32 = 0x1d400 /*𝐀*/; char16_t b16 = 0x62 /*b*/, z16 = 0x7a, ib16 = 0x203d, cake16_1 = 0xd83c, cake16_2 = 0xdf82, mathbfA16_1 = 0xd835, mathbfA16_2 = 0xdc00; std::wstring wstr; wstr.push_back(0x61); // a
wstr.push_back(0x2e18); // ⸘
if (sizeof(wchar_t) == 2) { wstr.push_back(mathbfA16_1); wstr.push_back(mathbfA16_2); } // 𝐀, utf16
else { wstr.push_back((wchar_t) mathbfA32); } // 𝐀, utf32
wstr.push_back(0x7a); // z
m.def("good_utf8_string", []() { return std::string(u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
m.def("good_utf16_string", [=]() { return std::u16string({ b16, ib16, cake16_1, cake16_2, mathbfA16_1, mathbfA16_2, z16 }); }); // b‽🎂𝐀z
m.def("good_utf32_string", [=]() { return std::u32string({ a32, mathbfA32, cake32, ib32, z32 }); }); // a𝐀🎂‽z
m.def("good_wchar_string", [=]() { return wstr; }); // a‽𝐀z
m.def("bad_utf8_string", []() { return std::string("abc\xd0" "def"); }); m.def("bad_utf16_string", [=]() { return std::u16string({ b16, char16_t(0xd800), z16 }); }); // Under Python 2.7, invalid unicode UTF-32 characters don't appear to trigger UnicodeDecodeError
if (PY_MAJOR_VERSION >= 3) m.def("bad_utf32_string", [=]() { return std::u32string({ a32, char32_t(0xd800), z32 }); }); if (PY_MAJOR_VERSION >= 3 || sizeof(wchar_t) == 2) m.def("bad_wchar_string", [=]() { return std::wstring({ wchar_t(0x61), wchar_t(0xd800) }); }); m.def("u8_Z", []() -> char { return 'Z'; }); m.def("u8_eacute", []() -> char { return '\xe9'; }); m.def("u16_ibang", [=]() -> char16_t { return ib16; }); m.def("u32_mathbfA", [=]() -> char32_t { return mathbfA32; }); m.def("wchar_heart", []() -> wchar_t { return 0x2665; });
// test_single_char_arguments
m.attr("wchar_size") = py::cast(sizeof(wchar_t)); m.def("ord_char", [](char c) -> int { return static_cast<unsigned char>(c); }); m.def("ord_char16", [](char16_t c) -> uint16_t { return c; }); m.def("ord_char32", [](char32_t c) -> uint32_t { return c; }); m.def("ord_wchar", [](wchar_t c) -> int { return c; });
// test_bytes_to_string
m.def("strlen", [](char *s) { return strlen(s); }); m.def("string_length", [](std::string s) { return s.length(); });
// test_string_view
#ifdef PYBIND11_HAS_STRING_VIEW
m.attr("has_string_view") = true; m.def("string_view_print", [](std::string_view s) { py::print(s, s.size()); }); m.def("string_view16_print", [](std::u16string_view s) { py::print(s, s.size()); }); m.def("string_view32_print", [](std::u32string_view s) { py::print(s, s.size()); }); m.def("string_view_chars", [](std::string_view s) { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; }); m.def("string_view16_chars", [](std::u16string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; }); m.def("string_view32_chars", [](std::u32string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; }); m.def("string_view_return", []() { return std::string_view(u8"utf8 secret \U0001f382"); }); m.def("string_view16_return", []() { return std::u16string_view(u"utf16 secret \U0001f382"); }); m.def("string_view32_return", []() { return std::u32string_view(U"utf32 secret \U0001f382"); });#endif
// test_tuple
m.def("pair_passthrough", [](std::pair<bool, std::string> input) { return std::make_pair(input.second, input.first); }, "Return a pair in reversed order"); m.def("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)); }, "Return a triple in reversed order");
// test_builtins_cast_return_none
m.def("return_none_string", []() -> std::string * { return nullptr; }); m.def("return_none_char", []() -> const char * { return nullptr; }); m.def("return_none_bool", []() -> bool * { return nullptr; }); m.def("return_none_int", []() -> int * { return nullptr; }); m.def("return_none_float", []() -> float * { return nullptr; });
// test_none_deferred
m.def("defer_none_cstring", [](char *) { return false; }); m.def("defer_none_cstring", [](py::none) { return true; }); m.def("defer_none_custom", [](UserType *) { return false; }); m.def("defer_none_custom", [](py::none) { return true; }); m.def("nodefer_none_void", [](void *) { return true; }); m.def("nodefer_none_void", [](py::none) { return false; });
// test_void_caster
m.def("load_nullptr_t", [](std::nullptr_t) {}); // not useful, but it should still compile
m.def("cast_nullptr_t", []() { return std::nullptr_t{}; });
// test_reference_wrapper
m.def("refwrap_builtin", [](std::reference_wrapper<int> p) { return 10 * p.get(); }); m.def("refwrap_usertype", [](std::reference_wrapper<UserType> p) { return p.get().value(); }); // Not currently supported (std::pair caster has return-by-value cast operator);
// triggers static_assert failure.
//m.def("refwrap_pair", [](std::reference_wrapper<std::pair<int, int>>) { });
m.def("refwrap_list", [](bool copy) { static IncType x1(1), x2(2); py::list l; for (auto &f : {std::ref(x1), std::ref(x2)}) { l.append(py::cast(f, copy ? py::return_value_policy::copy : py::return_value_policy::reference)); } return l; }, "copy"_a);
m.def("refwrap_iiw", [](const IncType &w) { return w.value(); }); m.def("refwrap_call_iiw", [](IncType &w, py::function f) { py::list l; l.append(f(std::ref(w))); l.append(f(std::cref(w))); IncType x(w.value()); l.append(f(std::ref(x))); IncType y(w.value()); auto r3 = std::ref(y); l.append(f(r3)); return l; });
// test_complex
m.def("complex_cast", [](float x) { return "{}"_s.format(x); }); m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); });}
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