[PATCHv3] libstdc++: provide debug impl of P2697 ctor [PR119742]

[Jonathan Wakely]

On Fri, 25 Jul 2025, 17:41 Nathan Myers, <ncm@cantrip.org> wrote:

> Changed in v3:
>  * Rely on std/bitset's string_view ctor for bounds checking.
>
> This adds the new bitset constructor from string_view
> defined in P2697 to the debug version of the type.
>
> libstdc++-v3/Changelog:
>         PR libstdc++/119742
>         * include/debug/bitset: Add new ctor.
>

OK for trunk, thanks


---
>  libstdc++-v3/include/debug/bitset | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/libstdc++-v3/include/debug/bitset
> b/libstdc++-v3/include/debug/bitset
> index ad9b7b5c4b0..e4d3e6619c9 100644
> --- a/libstdc++-v3/include/debug/bitset
> +++ b/libstdc++-v3/include/debug/bitset
> @@ -164,6 +164,17 @@ namespace __debug
>                _CharT __zero, _CharT __one = _CharT('1'))
>         : _Base(__str, __pos, __n, __zero, __one) { }
>
> +#ifdef __cpp_lib_bitset // ... from string_view
> +      template<class _CharT, class _Traits>
> +       constexpr explicit
> +       bitset(std::basic_string_view<_CharT, _Traits> __s,
> +         std::basic_string_view<_CharT, _Traits>::size_type __position =
> 0,
> +         std::basic_string_view<_CharT, _Traits>::size_type __n =
> +           std::basic_string_view<_CharT, _Traits>::npos,
> +         _CharT __zero = _CharT('0'), _CharT __one = _CharT('1'))
> +       : _Base(__s, __position, __n, __zero, __one) { }
> +#endif
> +
>        _GLIBCXX23_CONSTEXPR
>        bitset(const _Base& __x) : _Base(__x) { }
>
> --
> 2.50.0
>
>
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