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Make std::filesystem::path conversion to/from UTF-8 encoded string explicit (#4631)

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* Make std::filesystem::path conversion to/from UTF-8 encoded JSON string explicit.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Experimental: Changing C++ standard detection logic to accommodate potential corner cases.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Drop C++ standard tests for compilers which do not implement required features.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Drop C++ standard tests for MSVC versions which do not implement required features.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

---------

Signed-off-by: Richard Musil <risa2000x@gmail.com>
Co-authored-by: Richard Musil <risa2000x@gmail.com>
This commit is contained in:
risa2000andRichard Musil authored and GitHub committed 2025-04-04 10:59:23 +02:00
1 parent 79587f896e
commit 11aa5f944d
8 files changed
+85 -15
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include/nlohmann/detail/conversions/from_json.hpp
+6 -1
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@@ -539,7 +539,12 @@ inline void from_json(const BasicJsonType& j, std_fs::path& p)
{
JSON_THROW(type_error::create(302, concat("type must be string, but is ", j.type_name()), &j));
}
p = *j.template get_ptr<const typename BasicJsonType::string_t*>();
const auto& s = *j.template get_ptr<const typename BasicJsonType::string_t*>();
#ifdef JSON_HAS_CPP_20
p = std_fs::path(std::u8string_view(reinterpret_cast<const char8_t*>(s.data()), s.size()));
#else
p = std_fs::u8path(s); // accepts UTF-8 encoded std::string in C++17, deprecated in C++20
#endif
}
#endif
include/nlohmann/detail/conversions/to_json.hpp
+6 -1
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@@ -443,7 +443,12 @@ inline void to_json(BasicJsonType& j, const T& t)
template<typename BasicJsonType>
inline void to_json(BasicJsonType& j, const std_fs::path& p)
{
j = p.string();
#ifdef JSON_HAS_CPP_20
const std::u8string s = p.u8string();
j = std::string(s.begin(), s.end());
#else
j = p.u8string(); // returns std::string in C++17
#endif
}
#endif