[PATCH] libstdc++: Implement LWG4403: CTAD misses difference type casting

[Matthias Kretz]

From: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	* include/bits/simd_vec.h (basic_vec deduction guide): Explicit
	cast to simd-size-type from range size type.

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
---
 libstdc++-v3/include/bits/simd_vec.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/bits/simd_vec.h b/libstdc++-v3/include/bits/
simd_vec.h
index da194824e72..2574bf7c3ad 100644
--- a/libstdc++-v3/include/bits/simd_vec.h
+++ b/libstdc++-v3/include/bits/simd_vec.h
@@ -2264,9 +2264,9 @@ basic_vec(_Rg&& __range, flags<_Flags...> __flags = {})
     -> basic_vec<ranges::range_value_t<_Rg>,
 		 __deduce_abi_t<ranges::range_value_t<_Rg>,
 #if 0 // PR117849
-				ranges::size(__r)>>;
+				
static_cast<__simd_size_type>(ranges::size(__r))>>;
 #else
-				decltype(std::span(__r))::extent>>;
+				
static_cast<__simd_size_type>(decltype(std::span(__r))::extent)>>;
 #endif
 
   template <size_t _Bytes, typename _Ap>
-- 
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 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtz Center for Heavy Ion Research               https://gsi.de
 std::simd
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