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Fix char &
arguments being non-bindable
This changes the caster to return a reference to a (new) local `CharT` type caster member so that binding lvalue-reference char arguments works (currently it results in a compilation failure). Fixes #1116
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@ -1216,6 +1216,7 @@ template <typename CharT> struct type_caster<CharT, enable_if_t<is_std_char_type
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using StringCaster = type_caster<StringType>;
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StringCaster str_caster;
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bool none = false;
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CharT one_char = 0;
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public:
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bool load(handle src, bool convert) {
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if (!src) return false;
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@ -1243,7 +1244,7 @@ public:
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}
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operator CharT*() { return none ? nullptr : const_cast<CharT *>(static_cast<StringType &>(str_caster).c_str()); }
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operator CharT() {
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operator CharT&() {
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if (none)
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throw value_error("Cannot convert None to a character");
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@ -1267,7 +1268,8 @@ public:
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if (char0_bytes == str_len) {
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// If we have a 128-255 value, we can decode it into a single char:
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if (char0_bytes == 2 && (v0 & 0xFC) == 0xC0) { // 0x110000xx 0x10xxxxxx
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return static_cast<CharT>(((v0 & 3) << 6) + (static_cast<unsigned char>(value[1]) & 0x3F));
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one_char = static_cast<CharT>(((v0 & 3) << 6) + (static_cast<unsigned char>(value[1]) & 0x3F));
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return one_char;
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}
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// Otherwise we have a single character, but it's > U+00FF
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throw value_error("Character code point not in range(0x100)");
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@ -1278,19 +1280,20 @@ public:
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// surrogate pair with total length 2 instantly indicates a range error (but not a "your
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// string was too long" error).
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else if (StringCaster::UTF_N == 16 && str_len == 2) {
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char16_t v0 = static_cast<char16_t>(value[0]);
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if (v0 >= 0xD800 && v0 < 0xE000)
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one_char = static_cast<CharT>(value[0]);
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if (one_char >= 0xD800 && one_char < 0xE000)
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throw value_error("Character code point not in range(0x10000)");
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}
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if (str_len != 1)
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throw value_error("Expected a character, but multi-character string found");
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return value[0];
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one_char = value[0];
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return one_char;
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}
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static constexpr auto name = _(PYBIND11_STRING_NAME);
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template <typename _T> using cast_op_type = remove_reference_t<pybind11::detail::cast_op_type<_T>>;
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template <typename _T> using cast_op_type = pybind11::detail::cast_op_type<_T>;
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};
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// Base implementation for std::tuple and std::pair
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@ -50,7 +50,9 @@ TEST_SUBMODULE(builtin_casters, m) {
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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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@ -44,6 +44,7 @@ def test_single_char_arguments():
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toolong_message = "Expected a character, but multi-character string found"
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assert m.ord_char(u'a') == 0x61 # simple ASCII
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assert m.ord_char_lv(u'b') == 0x62
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assert m.ord_char(u'é') == 0xE9 # requires 2 bytes in utf-8, but can be stuffed in a char
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char(u'Ā') == 0x100 # requires 2 bytes, doesn't fit in a char
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@ -54,9 +55,11 @@ def test_single_char_arguments():
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assert m.ord_char16(u'a') == 0x61
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assert m.ord_char16(u'é') == 0xE9
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assert m.ord_char16_lv(u'ê') == 0xEA
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assert m.ord_char16(u'Ā') == 0x100
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assert m.ord_char16(u'‽') == 0x203d
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assert m.ord_char16(u'♥') == 0x2665
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assert m.ord_char16_lv(u'♡') == 0x2661
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char16(u'🎂') == 0x1F382 # requires surrogate pair
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assert str(excinfo.value) == toobig_message(0x10000)
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