From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Mon, 9 Dec 2024 01:11:19 +0000 (+0100)
Subject: libstdc++: port bitwise relocatable away from is_trivial
X-Git-Tag: basepoints/gcc-16~3493
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e4a0157c2397c9b582cff71d114240a6b083a3dc;p=thirdparty%2Fgcc.git

libstdc++: port bitwise relocatable away from is_trivial

In preparation for the deprecation of is_trivial (P3247R2).
"bitwise relocation" (or "trivial relocation" à la P1144/P2786)
doesn't need the full-fledged notion of triviality, just checking for a
trivial move constructor and a trivial destructor is sufficient.

libstdc++-v3/ChangeLog:

	* include/bits/stl_uninitialized.h: Amended the
	__is_bitwise_relocatable type trait.

Signed-off-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
---

diff --git a/libstdc++-v3/include/bits/stl_uninitialized.h b/libstdc++-v3/include/bits/stl_uninitialized.h
index 2190261134e0..916288352d70 100644
--- a/libstdc++-v3/include/bits/stl_uninitialized.h
+++ b/libstdc++-v3/include/bits/stl_uninitialized.h
@@ -1248,7 +1248,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Also known as is_trivially_relocatable.
   template<typename _Tp, typename = void>
     struct __is_bitwise_relocatable
-    : is_trivial<_Tp> { };
+    : __and_<is_trivially_move_constructible<_Tp>, is_trivially_destructible<_Tp>> { };
 
   template <typename _InputIterator, typename _ForwardIterator,
 	    typename _Allocator>