[FIX] gcc15: conditionally borrowed_range views#3360
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gcc15 now implements std::ranges::to For `std::string` (as example), the call is delegated to `std::string(std::from_range, R &&)`. This then will use `std::ranges::data` to get the data pointer and just copy the data. This happens, for example, in format_sam's `id | detail::take_until_and_consume(is_space) | ranges::to<id_type>()`. Since the view is not an lvalue, it needs to be a borrowed_range for `std::ranges::data` to work. Similar to std::views, we make (some of) our views conditionally borrowed if the underlying range is borrowed.
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Documentation preview available at https://docs.seqan.de/preview/seqan/seqan3/3360 |
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gcc15 now implements
std::ranges::toFor
std::string(as example), the call is delegated tostd::string(std::from_range, R &&).This then will use
std::ranges::datato get the data pointer and just copy the data.This happens, for example, in format_sam's
id | detail::take_until_and_consume(is_space) | ranges::to<id_type>().Since the view is not an lvalue, it needs to be a borrowed_range for
std::ranges::datato work.Similar to std::views, we make (some of) our views conditionally borrowed if the underlying range is borrowed.
Edit: The problem of calling
std::ranges::dataon non-borrowed ranges in thestd::stringrange constructor is now also fixed in GCC. I was aware that this is likely a bug in GCC, but I found it worth making the views borrowed because it allows for optimizations (memcpy instead of iteration).