From 9739d7ebf05aefcdd85477900528d8bee69df215 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Dumont?= <fdumont@gcc.gnu.org>
Date: Wed, 14 Feb 2024 06:59:12 +0100
Subject: [PATCH] libstdc++: [_GLIBCXX_DEBUG] Fix std::__niter_base behavior
std::__niter_base is used in _GLIBCXX_DEBUG mode to remove _Safe_iterator<>
wrapper on random access iterators. But doing so it should also preserve original
behavior to remove __normal_iterator wrapper.
libstdc++-v3/ChangeLog:
* include/bits/stl_algobase.h (std::__niter_base): Redefine the overload
definitions for __gnu_debug::_Safe_iterator.
* include/debug/safe_iterator.tcc (std::__niter_base): Adapt declarations.
---
libstdc++-v3/include/bits/stl_algobase.h | 16 +++++++++++++++-
libstdc++-v3/include/debug/safe_iterator.tcc | 18 +++++++++++++++++-
2 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
index e7207f672665..0f73da131729 100644
--- a/libstdc++-v3/include/bits/stl_algobase.h
+++ b/libstdc++-v3/include/bits/stl_algobase.h
@@ -317,12 +317,26 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_NOEXCEPT_IF(std::is_nothrow_copy_constructible<_Iterator>::value)
{ return __it; }
+#if __cplusplus < 201103L
template<typename _Ite, typename _Seq>
- _GLIBCXX20_CONSTEXPR
_Ite
__niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
std::random_access_iterator_tag>&);
+ template<typename _Ite, typename _Cont, typename _Seq>
+ _Ite
+ __niter_base(const ::__gnu_debug::_Safe_iterator<
+ ::__gnu_cxx::__normal_iterator<_Ite, _Cont>, _Seq,
+ std::random_access_iterator_tag>&);
+#else
+ template<typename _Ite, typename _Seq>
+ _GLIBCXX20_CONSTEXPR
+ decltype(std::__niter_base(std::declval<_Ite>()))
+ __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
+ std::random_access_iterator_tag>&)
+ noexcept(std::is_nothrow_copy_constructible<_Ite>::value);
+#endif
+
// Reverse the __niter_base transformation to get a
// __normal_iterator back again (this assumes that __normal_iterator
// is only used to wrap random access iterators, like pointers).
diff --git a/libstdc++-v3/include/debug/safe_iterator.tcc b/libstdc++-v3/include/debug/safe_iterator.tcc
index 6eb70cbda049..a8b24233e854 100644
--- a/libstdc++-v3/include/debug/safe_iterator.tcc
+++ b/libstdc++-v3/include/debug/safe_iterator.tcc
@@ -235,13 +235,29 @@ namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
+#if __cplusplus < 201103L
template<typename _Ite, typename _Seq>
- _GLIBCXX20_CONSTEXPR
_Ite
__niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
std::random_access_iterator_tag>& __it)
{ return __it.base(); }
+ template<typename _Ite, typename _Cont, typename _DbgSeq>
+ _Ite
+ __niter_base(const ::__gnu_debug::_Safe_iterator<
+ ::__gnu_cxx::__normal_iterator<_Ite, _Cont>, _DbgSeq,
+ std::random_access_iterator_tag>& __it)
+ { return __it.base().base(); }
+#else
+ template<typename _Ite, typename _Seq>
+ _GLIBCXX20_CONSTEXPR
+ decltype(std::__niter_base(std::declval<_Ite>()))
+ __niter_base(const ::__gnu_debug::_Safe_iterator<_Ite, _Seq,
+ std::random_access_iterator_tag>& __it)
+ noexcept(std::is_nothrow_copy_constructible<_Ite>::value)
+ { return std::__niter_base(__it.base()); }
+#endif
+
template<bool _IsMove,
typename _Ite, typename _Seq, typename _Cat, typename _OI>
_GLIBCXX20_CONSTEXPR
--
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