mirror of https://github.com/pybind/pybind11.git
272 lines
13 KiB
C++
272 lines
13 KiB
C++
/*
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tests/test_builtin_casters.cpp -- Casters available without any additional headers
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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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#include <pybind11/complex.h>
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
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#endif
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struct ConstRefCasted {
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int tag;
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};
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PYBIND11_NAMESPACE_BEGIN(pybind11)
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PYBIND11_NAMESPACE_BEGIN(detail)
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template <>
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class type_caster<ConstRefCasted> {
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public:
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static constexpr auto name = _<ConstRefCasted>();
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// Input is unimportant, a new value will always be constructed based on the
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// cast operator.
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bool load(handle, bool) { return true; }
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operator ConstRefCasted&&() { value = {1}; return std::move(value); }
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operator ConstRefCasted&() { value = {2}; return value; }
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operator ConstRefCasted*() { value = {3}; return &value; }
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operator const ConstRefCasted&() { value = {4}; return value; }
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operator const ConstRefCasted*() { value = {5}; return &value; }
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// custom cast_op to explicitly propagate types to the conversion operators.
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template <typename T_>
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using cast_op_type =
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/// const
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conditional_t<
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std::is_same<remove_reference_t<T_>, const ConstRefCasted*>::value, const ConstRefCasted*,
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conditional_t<
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std::is_same<T_, const ConstRefCasted&>::value, const ConstRefCasted&,
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/// non-const
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conditional_t<
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std::is_same<remove_reference_t<T_>, ConstRefCasted*>::value, ConstRefCasted*,
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conditional_t<
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std::is_same<T_, ConstRefCasted&>::value, ConstRefCasted&,
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/* else */ConstRefCasted&&>>>>;
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private:
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ConstRefCasted value = {0};
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};
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PYBIND11_NAMESPACE_END(detail)
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PYBIND11_NAMESPACE_END(pybind11)
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TEST_SUBMODULE(builtin_casters, m) {
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// test_simple_string
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m.def("string_roundtrip", [](const char *s) { return s; });
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// test_unicode_conversion
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// Some test characters in utf16 and utf32 encodings. The last one (the 𝐀) contains a null byte
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char32_t a32 = 0x61 /*a*/, z32 = 0x7a /*z*/, ib32 = 0x203d /*‽*/, cake32 = 0x1f382 /*🎂*/, mathbfA32 = 0x1d400 /*𝐀*/;
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char16_t b16 = 0x62 /*b*/, z16 = 0x7a, ib16 = 0x203d, cake16_1 = 0xd83c, cake16_2 = 0xdf82, mathbfA16_1 = 0xd835, mathbfA16_2 = 0xdc00;
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std::wstring wstr;
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wstr.push_back(0x61); // a
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wstr.push_back(0x2e18); // ⸘
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if (sizeof(wchar_t) == 2) { wstr.push_back(mathbfA16_1); wstr.push_back(mathbfA16_2); } // 𝐀, utf16
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else { wstr.push_back((wchar_t) mathbfA32); } // 𝐀, utf32
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wstr.push_back(0x7a); // z
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m.def("good_utf8_string", []() { return std::string((const char*)u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
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m.def("good_utf16_string", [=]() { return std::u16string({ b16, ib16, cake16_1, cake16_2, mathbfA16_1, mathbfA16_2, z16 }); }); // b‽🎂𝐀z
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m.def("good_utf32_string", [=]() { return std::u32string({ a32, mathbfA32, cake32, ib32, z32 }); }); // a𝐀🎂‽z
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m.def("good_wchar_string", [=]() { return wstr; }); // a‽𝐀z
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m.def("bad_utf8_string", []() { return std::string("abc\xd0" "def"); });
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m.def("bad_utf16_string", [=]() { return std::u16string({ b16, char16_t(0xd800), z16 }); });
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// Under Python 2.7, invalid unicode UTF-32 characters don't appear to trigger UnicodeDecodeError
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if (PY_MAJOR_VERSION >= 3)
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m.def("bad_utf32_string", [=]() { return std::u32string({ a32, char32_t(0xd800), z32 }); });
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if (PY_MAJOR_VERSION >= 3 || sizeof(wchar_t) == 2)
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m.def("bad_wchar_string", [=]() { return std::wstring({ wchar_t(0x61), wchar_t(0xd800) }); });
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m.def("u8_Z", []() -> char { return 'Z'; });
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m.def("u8_eacute", []() -> char { return '\xe9'; });
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m.def("u16_ibang", [=]() -> char16_t { return ib16; });
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m.def("u32_mathbfA", [=]() -> char32_t { return mathbfA32; });
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m.def("wchar_heart", []() -> wchar_t { return 0x2665; });
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// test_single_char_arguments
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m.attr("wchar_size") = py::cast(sizeof(wchar_t));
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m.def("ord_char", [](char c) -> int { return static_cast<unsigned char>(c); });
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m.def("ord_char_lv", [](char &c) -> int { return static_cast<unsigned char>(c); });
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m.def("ord_char16", [](char16_t c) -> uint16_t { return c; });
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m.def("ord_char16_lv", [](char16_t &c) -> uint16_t { return c; });
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m.def("ord_char32", [](char32_t c) -> uint32_t { return c; });
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m.def("ord_wchar", [](wchar_t c) -> int { return c; });
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// test_bytes_to_string
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m.def("strlen", [](char *s) { return strlen(s); });
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m.def("string_length", [](std::string s) { return s.length(); });
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#ifdef PYBIND11_HAS_U8STRING
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m.attr("has_u8string") = true;
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m.def("good_utf8_u8string", []() { return std::u8string(u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
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m.def("bad_utf8_u8string", []() { return std::u8string((const char8_t*)"abc\xd0" "def"); });
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m.def("u8_char8_Z", []() -> char8_t { return u8'Z'; });
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// test_single_char_arguments
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m.def("ord_char8", [](char8_t c) -> int { return static_cast<unsigned char>(c); });
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m.def("ord_char8_lv", [](char8_t &c) -> int { return static_cast<unsigned char>(c); });
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#endif
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// test_string_view
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#ifdef PYBIND11_HAS_STRING_VIEW
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m.attr("has_string_view") = true;
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m.def("string_view_print", [](std::string_view s) { py::print(s, s.size()); });
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m.def("string_view16_print", [](std::u16string_view s) { py::print(s, s.size()); });
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m.def("string_view32_print", [](std::u32string_view s) { py::print(s, s.size()); });
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m.def("string_view_chars", [](std::string_view s) { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; });
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m.def("string_view16_chars", [](std::u16string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
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m.def("string_view32_chars", [](std::u32string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
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m.def("string_view_return", []() { return std::string_view((const char*)u8"utf8 secret \U0001f382"); });
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m.def("string_view16_return", []() { return std::u16string_view(u"utf16 secret \U0001f382"); });
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m.def("string_view32_return", []() { return std::u32string_view(U"utf32 secret \U0001f382"); });
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# ifdef PYBIND11_HAS_U8STRING
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m.def("string_view8_print", [](std::u8string_view s) { py::print(s, s.size()); });
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m.def("string_view8_chars", [](std::u8string_view s) { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; });
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m.def("string_view8_return", []() { return std::u8string_view(u8"utf8 secret \U0001f382"); });
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# endif
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#endif
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// test_integer_casting
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m.def("i32_str", [](std::int32_t v) { return std::to_string(v); });
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m.def("u32_str", [](std::uint32_t v) { return std::to_string(v); });
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m.def("i64_str", [](std::int64_t v) { return std::to_string(v); });
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m.def("u64_str", [](std::uint64_t v) { return std::to_string(v); });
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// test_int_convert
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m.def("int_passthrough", [](int arg) { return arg; });
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m.def("int_passthrough_noconvert", [](int arg) { return arg; }, py::arg{}.noconvert());
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// test_tuple
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m.def("pair_passthrough", [](std::pair<bool, std::string> input) {
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return std::make_pair(input.second, input.first);
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}, "Return a pair in reversed order");
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m.def("tuple_passthrough", [](std::tuple<bool, std::string, int> input) {
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return std::make_tuple(std::get<2>(input), std::get<1>(input), std::get<0>(input));
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}, "Return a triple in reversed order");
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m.def("empty_tuple", []() { return std::tuple<>(); });
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static std::pair<RValueCaster, RValueCaster> lvpair;
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static std::tuple<RValueCaster, RValueCaster, RValueCaster> lvtuple;
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static std::pair<RValueCaster, std::tuple<RValueCaster, std::pair<RValueCaster, RValueCaster>>> lvnested;
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m.def("rvalue_pair", []() { return std::make_pair(RValueCaster{}, RValueCaster{}); });
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m.def("lvalue_pair", []() -> const decltype(lvpair) & { return lvpair; });
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m.def("rvalue_tuple", []() { return std::make_tuple(RValueCaster{}, RValueCaster{}, RValueCaster{}); });
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m.def("lvalue_tuple", []() -> const decltype(lvtuple) & { return lvtuple; });
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m.def("rvalue_nested", []() {
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return std::make_pair(RValueCaster{}, std::make_tuple(RValueCaster{}, std::make_pair(RValueCaster{}, RValueCaster{}))); });
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m.def("lvalue_nested", []() -> const decltype(lvnested) & { return lvnested; });
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static std::pair<int, std::string> int_string_pair{2, "items"};
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m.def("int_string_pair", []() { return &int_string_pair; });
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// test_builtins_cast_return_none
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m.def("return_none_string", []() -> std::string * { return nullptr; });
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m.def("return_none_char", []() -> const char * { return nullptr; });
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m.def("return_none_bool", []() -> bool * { return nullptr; });
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m.def("return_none_int", []() -> int * { return nullptr; });
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m.def("return_none_float", []() -> float * { return nullptr; });
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m.def("return_none_pair", []() -> std::pair<int,int> * { return nullptr; });
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// test_none_deferred
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m.def("defer_none_cstring", [](char *) { return false; });
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m.def("defer_none_cstring", [](py::none) { return true; });
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m.def("defer_none_custom", [](UserType *) { return false; });
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m.def("defer_none_custom", [](py::none) { return true; });
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m.def("nodefer_none_void", [](void *) { return true; });
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m.def("nodefer_none_void", [](py::none) { return false; });
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// test_void_caster
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m.def("load_nullptr_t", [](std::nullptr_t) {}); // not useful, but it should still compile
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m.def("cast_nullptr_t", []() { return std::nullptr_t{}; });
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// [workaround(intel)] ICC 20/21 breaks with py::arg().stuff, using py::arg{}.stuff works.
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// test_bool_caster
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m.def("bool_passthrough", [](bool arg) { return arg; });
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m.def("bool_passthrough_noconvert", [](bool arg) { return arg; }, py::arg{}.noconvert());
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// TODO: This should be disabled and fixed in future Intel compilers
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#if !defined(__INTEL_COMPILER)
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// Test "bool_passthrough_noconvert" again, but using () instead of {} to construct py::arg
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// When compiled with the Intel compiler, this results in segmentation faults when importing
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// the module. Tested with icc (ICC) 2021.1 Beta 20200827, this should be tested again when
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// a newer version of icc is available.
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m.def("bool_passthrough_noconvert2", [](bool arg) { return arg; }, py::arg().noconvert());
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#endif
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// test_reference_wrapper
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m.def("refwrap_builtin", [](std::reference_wrapper<int> p) { return 10 * p.get(); });
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m.def("refwrap_usertype", [](std::reference_wrapper<UserType> p) { return p.get().value(); });
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m.def("refwrap_usertype_const", [](std::reference_wrapper<const UserType> p) { return p.get().value(); });
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m.def("refwrap_lvalue", []() -> std::reference_wrapper<UserType> {
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static UserType x(1);
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return std::ref(x);
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});
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m.def("refwrap_lvalue_const", []() -> std::reference_wrapper<const UserType> {
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static UserType x(1);
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return std::cref(x);
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});
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// Not currently supported (std::pair caster has return-by-value cast operator);
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// triggers static_assert failure.
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//m.def("refwrap_pair", [](std::reference_wrapper<std::pair<int, int>>) { });
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m.def("refwrap_list", [](bool copy) {
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static IncType x1(1), x2(2);
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py::list l;
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for (auto &f : {std::ref(x1), std::ref(x2)}) {
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l.append(py::cast(f, copy ? py::return_value_policy::copy
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: py::return_value_policy::reference));
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}
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return l;
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}, "copy"_a);
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m.def("refwrap_iiw", [](const IncType &w) { return w.value(); });
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m.def("refwrap_call_iiw", [](IncType &w, py::function f) {
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py::list l;
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l.append(f(std::ref(w)));
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l.append(f(std::cref(w)));
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IncType x(w.value());
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l.append(f(std::ref(x)));
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IncType y(w.value());
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auto r3 = std::ref(y);
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l.append(f(r3));
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return l;
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});
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// test_complex
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m.def("complex_cast", [](float x) { return "{}"_s.format(x); });
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m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); });
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// test int vs. long (Python 2)
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m.def("int_cast", []() {return (int) 42;});
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m.def("long_cast", []() {return (long) 42;});
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m.def("longlong_cast", []() {return ULLONG_MAX;});
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/// test void* cast operator
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m.def("test_void_caster", []() -> bool {
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void *v = (void *) 0xabcd;
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py::object o = py::cast(v);
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return py::cast<void *>(o) == v;
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});
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// Tests const/non-const propagation in cast_op.
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m.def("takes", [](ConstRefCasted x) { return x.tag; });
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m.def("takes_move", [](ConstRefCasted&& x) { return x.tag; });
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m.def("takes_ptr", [](ConstRefCasted* x) { return x->tag; });
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m.def("takes_ref", [](ConstRefCasted& x) { return x.tag; });
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m.def("takes_ref_wrap", [](std::reference_wrapper<ConstRefCasted> x) { return x.get().tag; });
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m.def("takes_const_ptr", [](const ConstRefCasted* x) { return x->tag; });
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m.def("takes_const_ref", [](const ConstRefCasted& x) { return x.tag; });
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m.def("takes_const_ref_wrap", [](std::reference_wrapper<const ConstRefCasted> x) { return x.get().tag; });
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}
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