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authorNat Goodspeed <nat@lindenlab.com>2024-09-25 21:38:46 -0400
committerNat Goodspeed <nat@lindenlab.com>2024-09-25 21:38:46 -0400
commitdc0c6d396eb70392f294eea65975646dad662f6a (patch)
tree9a99cb4015a7199c624fe4d726b8ac5bf874fb6d /indra/llcommon/llcond.h
parent55df7328c6f8c864ea309c57d73e791e079b3c2c (diff)
Adapt `fsyspath` for C++20 conventions.
In C++20, `std::filesystem::u8path()` (that accepts a UTF-8 encoded `std::string` and returns a `std::filesystem::path`) is deprecated. Instead, to engage UTF-8 coding conversions, we're supposed to pass the `path` constructor a `std::u8string`, i.e. a `std::basic_string<char8_t>`. Since `char8_t` is a type distinct from both `char` and `unsigned char`, we must Do Something to pass a UTF-8 encoded `std::string` into `std::filesystem::path`. To avoid copying characters from a `std::string` into a temporary `std::u8string` and from there into the `std::filesystem::path`, make a `boost::transform_iterator` that accepts a `std::string_view::iterator` and adapts it to dereference `char8_t` characters. Make `fsyspath(std::string_view)` engage the base-class constructor accepting (iterator, iterator), adapting `string_view::begin()` and `end()` to deliver `char8_t` characters. Use the same tactic for `fsyspath::operator=(std::string_view)`, explicitly calling `std::filesystem::path::assign()` with the adapted iterators. To resolve ambiguities, provide both constructors and assignment operators accepting `(const std::string&)` and `(const char*)`, explicitly converting each to `std::string_view`. At the same time, `std::filesystem::path::u8string()` now returns `std::u8string` rather than `std::string`. Since `std::filesystem::path` delivers only that `std::u8string` rather than iterators into its internal representation, we can't avoid capturing it and copying to the returned `std::string`. Remove explicit `.u8string()` calls from a few existing `fsyspath` instances, now that `fsyspath` supports implicit conversion to `std::string`.
Diffstat (limited to 'indra/llcommon/llcond.h')
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