test_builtin_casters.cpp revision 12391:ceeca8b41e4b
1/* 2 tests/test_builtin_casters.cpp -- Casters available without any additional headers 3 4 Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch> 5 6 All rights reserved. Use of this source code is governed by a 7 BSD-style license that can be found in the LICENSE file. 8*/ 9 10#include "pybind11_tests.h" 11#include <pybind11/complex.h> 12 13#if defined(_MSC_VER) 14# pragma warning(push) 15# pragma warning(disable: 4127) // warning C4127: Conditional expression is constant 16#endif 17 18TEST_SUBMODULE(builtin_casters, m) { 19 // test_simple_string 20 m.def("string_roundtrip", [](const char *s) { return s; }); 21 22 // test_unicode_conversion 23 // Some test characters in utf16 and utf32 encodings. The last one (the ) contains a null byte 24 char32_t a32 = 0x61 /*a*/, z32 = 0x7a /*z*/, ib32 = 0x203d /*‽*/, cake32 = 0x1f382 /**/, mathbfA32 = 0x1d400 /**/; 25 char16_t b16 = 0x62 /*b*/, z16 = 0x7a, ib16 = 0x203d, cake16_1 = 0xd83c, cake16_2 = 0xdf82, mathbfA16_1 = 0xd835, mathbfA16_2 = 0xdc00; 26 std::wstring wstr; 27 wstr.push_back(0x61); // a 28 wstr.push_back(0x2e18); // ⸘ 29 if (sizeof(wchar_t) == 2) { wstr.push_back(mathbfA16_1); wstr.push_back(mathbfA16_2); } // , utf16 30 else { wstr.push_back((wchar_t) mathbfA32); } // , utf32 31 wstr.push_back(0x7a); // z 32 33 m.def("good_utf8_string", []() { return std::string(u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 34 m.def("good_utf16_string", [=]() { return std::u16string({ b16, ib16, cake16_1, cake16_2, mathbfA16_1, mathbfA16_2, z16 }); }); // b‽z 35 m.def("good_utf32_string", [=]() { return std::u32string({ a32, mathbfA32, cake32, ib32, z32 }); }); // a‽z 36 m.def("good_wchar_string", [=]() { return wstr; }); // a‽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 }); }); 39 // Under Python 2.7, invalid unicode UTF-32 characters don't appear to trigger UnicodeDecodeError 40 if (PY_MAJOR_VERSION >= 3) 41 m.def("bad_utf32_string", [=]() { return std::u32string({ a32, char32_t(0xd800), z32 }); }); 42 if (PY_MAJOR_VERSION >= 3 || sizeof(wchar_t) == 2) 43 m.def("bad_wchar_string", [=]() { return std::wstring({ wchar_t(0x61), wchar_t(0xd800) }); }); 44 m.def("u8_Z", []() -> char { return 'Z'; }); 45 m.def("u8_eacute", []() -> char { return '\xe9'; }); 46 m.def("u16_ibang", [=]() -> char16_t { return ib16; }); 47 m.def("u32_mathbfA", [=]() -> char32_t { return mathbfA32; }); 48 m.def("wchar_heart", []() -> wchar_t { return 0x2665; }); 49 50 // test_single_char_arguments 51 m.attr("wchar_size") = py::cast(sizeof(wchar_t)); 52 m.def("ord_char", [](char c) -> int { return static_cast<unsigned char>(c); }); 53 m.def("ord_char16", [](char16_t c) -> uint16_t { return c; }); 54 m.def("ord_char32", [](char32_t c) -> uint32_t { return c; }); 55 m.def("ord_wchar", [](wchar_t c) -> int { return c; }); 56 57 // test_bytes_to_string 58 m.def("strlen", [](char *s) { return strlen(s); }); 59 m.def("string_length", [](std::string s) { return s.length(); }); 60 61 // test_string_view 62#ifdef PYBIND11_HAS_STRING_VIEW 63 m.attr("has_string_view") = true; 64 m.def("string_view_print", [](std::string_view s) { py::print(s, s.size()); }); 65 m.def("string_view16_print", [](std::u16string_view s) { py::print(s, s.size()); }); 66 m.def("string_view32_print", [](std::u32string_view s) { py::print(s, s.size()); }); 67 m.def("string_view_chars", [](std::string_view s) { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; }); 68 m.def("string_view16_chars", [](std::u16string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; }); 69 m.def("string_view32_chars", [](std::u32string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; }); 70 m.def("string_view_return", []() { return std::string_view(u8"utf8 secret \U0001f382"); }); 71 m.def("string_view16_return", []() { return std::u16string_view(u"utf16 secret \U0001f382"); }); 72 m.def("string_view32_return", []() { return std::u32string_view(U"utf32 secret \U0001f382"); }); 73#endif 74 75 // test_integer_casting 76 m.def("i32_str", [](std::int32_t v) { return std::to_string(v); }); 77 m.def("u32_str", [](std::uint32_t v) { return std::to_string(v); }); 78 m.def("i64_str", [](std::int64_t v) { return std::to_string(v); }); 79 m.def("u64_str", [](std::uint64_t v) { return std::to_string(v); }); 80 81 // test_tuple 82 m.def("pair_passthrough", [](std::pair<bool, std::string> input) { 83 return std::make_pair(input.second, input.first); 84 }, "Return a pair in reversed order"); 85 m.def("tuple_passthrough", [](std::tuple<bool, std::string, int> input) { 86 return std::make_tuple(std::get<2>(input), std::get<1>(input), std::get<0>(input)); 87 }, "Return a triple in reversed order"); 88 m.def("empty_tuple", []() { return std::tuple<>(); }); 89 static std::pair<RValueCaster, RValueCaster> lvpair; 90 static std::tuple<RValueCaster, RValueCaster, RValueCaster> lvtuple; 91 static std::pair<RValueCaster, std::tuple<RValueCaster, std::pair<RValueCaster, RValueCaster>>> lvnested; 92 m.def("rvalue_pair", []() { return std::make_pair(RValueCaster{}, RValueCaster{}); }); 93 m.def("lvalue_pair", []() -> const decltype(lvpair) & { return lvpair; }); 94 m.def("rvalue_tuple", []() { return std::make_tuple(RValueCaster{}, RValueCaster{}, RValueCaster{}); }); 95 m.def("lvalue_tuple", []() -> const decltype(lvtuple) & { return lvtuple; }); 96 m.def("rvalue_nested", []() { 97 return std::make_pair(RValueCaster{}, std::make_tuple(RValueCaster{}, std::make_pair(RValueCaster{}, RValueCaster{}))); }); 98 m.def("lvalue_nested", []() -> const decltype(lvnested) & { return lvnested; }); 99 100 // test_builtins_cast_return_none 101 m.def("return_none_string", []() -> std::string * { return nullptr; }); 102 m.def("return_none_char", []() -> const char * { return nullptr; }); 103 m.def("return_none_bool", []() -> bool * { return nullptr; }); 104 m.def("return_none_int", []() -> int * { return nullptr; }); 105 m.def("return_none_float", []() -> float * { return nullptr; }); 106 107 // test_none_deferred 108 m.def("defer_none_cstring", [](char *) { return false; }); 109 m.def("defer_none_cstring", [](py::none) { return true; }); 110 m.def("defer_none_custom", [](UserType *) { return false; }); 111 m.def("defer_none_custom", [](py::none) { return true; }); 112 m.def("nodefer_none_void", [](void *) { return true; }); 113 m.def("nodefer_none_void", [](py::none) { return false; }); 114 115 // test_void_caster 116 m.def("load_nullptr_t", [](std::nullptr_t) {}); // not useful, but it should still compile 117 m.def("cast_nullptr_t", []() { return std::nullptr_t{}; }); 118 119 // test_bool_caster 120 m.def("bool_passthrough", [](bool arg) { return arg; }); 121 m.def("bool_passthrough_noconvert", [](bool arg) { return arg; }, py::arg().noconvert()); 122 123 // test_reference_wrapper 124 m.def("refwrap_builtin", [](std::reference_wrapper<int> p) { return 10 * p.get(); }); 125 m.def("refwrap_usertype", [](std::reference_wrapper<UserType> p) { return p.get().value(); }); 126 // Not currently supported (std::pair caster has return-by-value cast operator); 127 // triggers static_assert failure. 128 //m.def("refwrap_pair", [](std::reference_wrapper<std::pair<int, int>>) { }); 129 130 m.def("refwrap_list", [](bool copy) { 131 static IncType x1(1), x2(2); 132 py::list l; 133 for (auto &f : {std::ref(x1), std::ref(x2)}) { 134 l.append(py::cast(f, copy ? py::return_value_policy::copy 135 : py::return_value_policy::reference)); 136 } 137 return l; 138 }, "copy"_a); 139 140 m.def("refwrap_iiw", [](const IncType &w) { return w.value(); }); 141 m.def("refwrap_call_iiw", [](IncType &w, py::function f) { 142 py::list l; 143 l.append(f(std::ref(w))); 144 l.append(f(std::cref(w))); 145 IncType x(w.value()); 146 l.append(f(std::ref(x))); 147 IncType y(w.value()); 148 auto r3 = std::ref(y); 149 l.append(f(r3)); 150 return l; 151 }); 152 153 // test_complex 154 m.def("complex_cast", [](float x) { return "{}"_s.format(x); }); 155 m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); }); 156} 157