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add support for std::basic_string/std::basic_string_view<std::byte> and <uint8_t> by extending string_caster coverage to those types. Treat strings of those types as raw bytes (no decoding)

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This commit is contained in:
Guillaume Giraud 2022-03-16 15:39:56 +01:00
parent 3a543a12e1
commit 263ff1aeb7
1 changed files with 25 additions and 7 deletions
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24
include/pybind11/cast.h
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@ -108,6 +108,10 @@ public:
template <typename CharT>
using is_std_char_type = any_of<std::is_same<CharT, char>, /* std::string */
#if defined(PYBIND11_CPP17)
std::is_same<CharT, std::byte>, /* std::byte */
#endif
std::is_same<CharT, uint8_t>, /* uint8_t */
#if defined(PYBIND11_HAS_U8STRING)
std::is_same<CharT, char8_t>, /* std::u8string */
#endif
@ -434,12 +438,20 @@ struct string_caster {
cast(const StringType &src, return_value_policy /* policy */, handle /* parent */) {
const char *buffer = reinterpret_cast<const char *>(src.data());
auto nbytes = ssize_t(src.size() * sizeof(CharT));
if (std::is_same_v<CharT, uint8_t>
#if defined(PYBIND11_CPP17)
or std::is_same_v<CharT, std::byte>
#endif
) {
return PyBytes_FromStringAndSize(buffer, nbytes);
} else {
handle s = decode_utfN(buffer, nbytes);
if (!s) {
throw error_already_set();
}
return s;
}
}
PYBIND11_TYPE_CASTER(StringType, const_name(PYBIND11_STRING_NAME));
@ -461,12 +473,18 @@ private:
nullptr);
#endif
}
template<typename C>
using accept_bytes_as_is = any_of<std::is_same<C, char>,
#if defined(PYBIND11_CPP17)
std::is_same<C, std::byte>,
#endif
std::is_same<C, uint8_t>>;
// When loading into a std::string or char*, accept a bytes/bytearray object as-is (i.e.
// without any encoding/decoding attempt). For other C++ char sizes this is a no-op.
// which supports loading a unicode from a str, doesn't take this path.
template <typename C = CharT>
bool load_raw(enable_if_t<std::is_same<C, char>::value, handle> src) {
bool load_raw(enable_if_t<accept_bytes_as_is<C>::value, handle> src) {
if (PYBIND11_BYTES_CHECK(src.ptr())) {
// We were passed raw bytes; accept it into a std::string or char*
// without any encoding attempt.
@ -474,7 +492,7 @@ private:
if (!bytes) {
pybind11_fail("Unexpected PYBIND11_BYTES_AS_STRING() failure.");
}
value = StringType(bytes, (size_t) PYBIND11_BYTES_SIZE(src.ptr()));
value = StringType((const C *) bytes, (size_t) PYBIND11_BYTES_SIZE(src.ptr()));
return true;
}
if (PyByteArray_Check(src.ptr())) {
@ -492,7 +510,7 @@ private:
}
template <typename C = CharT>
bool load_raw(enable_if_t<!std::is_same<C, char>::value, handle>) {
bool load_raw(enable_if_t<!accept_bytes_as_is<C>::value, handle>) {
return false;
}
};