[committed] libstdc++: Avoid narrowing conversion in subrange constructor

[Jonathan Wakely]

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.

Tested powerpc64le-linux. Committed to trunk.

-------------- next part --------------
commit a55cda891d69b5a238d2e237903829995ca7249c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Oct 29 22:47:22 2020

    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 cc50e2ad4e4..416c3346254 100644
--- 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>