libstdc++: Avoid narrowing conversion in subrange constructor

libstdc++-v3/ChangeLog:

	* include/bits/ranges_util.h (subrange::subrange(R&&)): Use
	direct-initialization instead of list-initialization, so a
	potential narrowing conversion from ranges::size(r) to the
	stored size isn't ill-formed.

diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h
index cc50e2ad4e42311d451490aa7ae9a7a0e3c0fcb9..416c334625412a542098639f3635fab34bd1cfe2 100644 (file)
--- a/libstdc++-v3/include/bits/ranges_util.h
+++ b/libstdc++-v3/include/bits/ranges_util.h
@@ -247,7 +247,7 @@ namespace ranges
          && convertible_to<sentinel_t<_Rng>, _Sent>
        constexpr
        subrange(_Rng&& __r) requires _S_store_size && sized_range<_Rng>
-       : subrange{__r, ranges::size(__r)}
+       : subrange(__r, ranges::size(__r))
        { }
 
       template<__detail::__not_same_as<subrange> _Rng>