Right after I hit the send button I realized that I had forgotten to
remove the definition of __cpp_lib_list_remove_return_type on the Debug
forward_list side.
I haven't plan to define this macro in this context, I prefer to leave
it to normal implementation.
So here is the updated patch.
On 20/08/2018 22:26, François Dumont wrote:
This patch implements P0646R1 for Debug mode containers.
It fixes tests:
23_containers/forward_list/operations/remove_cxx20_return.cc
23_containers/forward_list/operations/unique_cxx20_return.cc
23_containers/list/operations/remove_cxx20_return.cc
23_containers/list/operations/unique_cxx20_return.cc
Note that it also adopt the Lib Defects 526 which had been implemented
only for the normal mode.
I'll commit this tomorrow if not told otherwise.
P0646R1 Improving the Return Value of Erase-Like Algorithms I
* include/debug/forward_list (forward_list::__remove_return_type):
Define typedef as size_type or void, according to __cplusplus value.
(_GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG): Define macro as abi-tag or
empty, according to __cplusplus value.
(_GLIBCXX20_ONLY): Define macro.
(forward_list::remove, forward_list::unique): Use typedef and macro
to change return type and add abi-tag for C++2a. Return number of
removed elements for C++2a.
(forward_list::remove_if<Pred>, forward_list::unique<BinPred>): Use
typedef to change return type for C++2a. Return number of removed
elements for C++2a.
* include/debug/list (list::__remove_return_type): Define typedef as
size_type or void, according to __cplusplus value.
(_GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG): Define macro as abi-tag or
empty, according to __cplusplus value.
(_GLIBCXX20_ONLY): Define macro.
(list::remove, list::unique): Use typedef and macro to change return
type and add abi-tag for C++2a. Return number of removed elements for
C++2a.
(list::remove_if<Predicate>, list::unique<BinaryPredicate>): Use
typedef
to change return type for C++2a. Return number of removed elements
for
C++2a.
François
diff --git a/libstdc++-v3/include/debug/forward_list b/libstdc++-v3/include/debug/forward_list
index e5ac09e8..840ed09 100644
--- a/libstdc++-v3/include/debug/forward_list
+++ b/libstdc++-v3/include/debug/forward_list
@@ -656,70 +656,113 @@ namespace __debug
const_iterator __before, const_iterator __last)
{ splice_after(__pos, std::move(__list), __before, __last); }
- void
+ private:
+#if __cplusplus > 201703L
+ using __remove_return_type = size_type;
+# define _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG \
+ __attribute__((__abi_tag__("__cxx20")))
+# define _GLIBCXX20_ONLY(__expr) __expr
+#else
+ using __remove_return_type = void;
+# define _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
+# define _GLIBCXX20_ONLY(__expr)
+#endif
+
+ public:
+ _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
remove(const _Tp& __val)
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::remove(__val);
+
+ size_type __removed __attribute__((__unused__)) = 0;
_Base_iterator __x = _Base::before_begin();
_Base_iterator __old = __x++;
+ _Base_iterator __extra = _Base::end();
while (__x != _Base::end())
{
if (*__x == __val)
- __x = _M_erase_after(__old);
- else
- __old = __x++;
+ {
+ if (std::__addressof(*__x) != std::__addressof(__val))
+ {
+ __x = _M_erase_after(__old);
+ _GLIBCXX20_ONLY( __removed++ );
+ continue;
+ }
+ else
+ __extra = __old;
+ }
+ __old = __x++;
}
+
+ if (__extra != _Base::end())
+ {
+ this->_M_erase_after(__extra);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+
+ return _GLIBCXX20_ONLY( __removed );
}
template<typename _Pred>
- void
+ __remove_return_type
remove_if(_Pred __pred)
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::remove_if(__pred);
+
+ size_type __removed __attribute__((__unused__)) = 0;
_Base_iterator __x = _Base::before_begin();
_Base_iterator __old = __x++;
while (__x != _Base::end())
- {
- if (__pred(*__x))
+ if (__pred(*__x))
+ {
__x = _M_erase_after(__old);
- else
- __old = __x++;
- }
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ __old = __x++;
+
+ return _GLIBCXX20_ONLY( __removed );
}
- void
+ _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
unique()
- {
- _Base_iterator __first = _Base::begin();
- _Base_iterator __last = _Base::end();
- if (__first == __last)
- return;
- _Base_iterator __next = std::next(__first);
- while (__next != __last)
- {
- if (*__first == *__next)
- __next = _M_erase_after(__first);
- else
- __first = __next++;
- }
- }
+ { return unique(std::equal_to<_Tp>()); }
template<typename _BinPred>
- void
+ __remove_return_type
unique(_BinPred __binary_pred)
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::unique(__binary_pred);
+
_Base_iterator __first = _Base::begin();
_Base_iterator __last = _Base::end();
if (__first == __last)
- return;
+ return _GLIBCXX20_ONLY(0);
+
+ size_type __removed __attribute__((__unused__)) = 0;
_Base_iterator __next = std::next(__first);
while (__next != __last)
{
if (__binary_pred(*__first, *__next))
- __next = _M_erase_after(__first);
+ {
+ __next = _M_erase_after(__first);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
else
__first = __next++;
}
+
+ return _GLIBCXX20_ONLY( __removed );
}
+#undef _GLIBCXX_FWDLIST_REMOVE_RETURN_TYPE_TAG
+#undef _GLIBCXX20_ONLY
+
void
merge(forward_list&& __list)
{
diff --git a/libstdc++-v3/include/debug/list b/libstdc++-v3/include/debug/list
index c6aea5d..5b3b88e 100644
--- a/libstdc++-v3/include/debug/list
+++ b/libstdc++-v3/include/debug/list
@@ -655,66 +655,135 @@ namespace __debug
{ splice(__position, std::move(__x), __first, __last); }
#endif
- void
+ private:
+#if __cplusplus > 201703L
+ typedef size_type __remove_return_type;
+# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG \
+ __attribute__((__abi_tag__("__cxx20")))
+# define _GLIBCXX20_ONLY(__expr) __expr
+#else
+ typedef void __remove_return_type;
+# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+# define _GLIBCXX20_ONLY(__expr)
+#endif
+
+ public:
+ _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
remove(const _Tp& __value)
{
- for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::remove(__value);
+
+ size_type __removed __attribute__((__unused__)) = 0;
+ _Base_iterator __first = _Base::begin();
+ _Base_iterator __last = _Base::end();
+ _Base_iterator __extra = __last;
+ while (__first != __last)
{
- if (*__x == __value)
- __x = _M_erase(__x);
+ if (*__first == __value)
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 526. Is it undefined if a function in the standard changes
+ // in parameters?
+ if (std::__addressof(*__first) != std::__addressof(__value))
+ {
+ __first = _M_erase(__first);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ {
+ __extra = __first;
+ ++__first;
+ }
else
- ++__x;
+ ++__first;
}
+
+ if (__extra != __last)
+ {
+ _M_erase(__extra);
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ return _GLIBCXX20_ONLY( __removed );
}
template<class _Predicate>
- void
+ __remove_return_type
remove_if(_Predicate __pred)
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::remove_if(__pred);
+
+ size_type __removed __attribute__((__unused__)) = 0;
for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
- {
- if (__pred(*__x))
+ if (__pred(*__x))
+ {
__x = _M_erase(__x);
- else
- ++__x;
- }
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ ++__x;
+
+ return _GLIBCXX20_ONLY( __removed );
}
- void
+ _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
unique()
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::unique();
+
+ if (empty())
+ return _GLIBCXX20_ONLY(0);
+
+ size_type __removed __attribute__((__unused__)) = 0;
_Base_iterator __first = _Base::begin();
_Base_iterator __last = _Base::end();
- if (__first == __last)
- return;
- _Base_iterator __next = __first; ++__next;
- while (__next != __last)
- {
- if (*__first == *__next)
- __next = _M_erase(__next);
- else
- __first = __next++;
- }
+ _Base_iterator __next = __first;
+ while (++__next != __last)
+ if (*__first == *__next)
+ {
+ _M_erase(__next);
+ __next = __first;
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ __first = __next;
+
+ return _GLIBCXX20_ONLY( __removed );
}
template<class _BinaryPredicate>
- void
+ __remove_return_type
unique(_BinaryPredicate __binary_pred)
{
+ if (!this->_M_iterators && !this->_M_const_iterators)
+ return _Base::unique(__binary_pred);
+
+ if (empty())
+ return _GLIBCXX20_ONLY(0);
+
+ size_type __removed __attribute__((__unused__)) = 0;
_Base_iterator __first = _Base::begin();
_Base_iterator __last = _Base::end();
- if (__first == __last)
- return;
- _Base_iterator __next = __first; ++__next;
- while (__next != __last)
- {
- if (__binary_pred(*__first, *__next))
- __next = _M_erase(__next);
- else
- __first = __next++;
- }
+ _Base_iterator __next = __first;;
+ while (++__next != __last)
+ if (__binary_pred(*__first, *__next))
+ {
+ _M_erase(__next);
+ __next = __first;
+ _GLIBCXX20_ONLY( __removed++ );
+ }
+ else
+ __first = __next;
+
+ return _GLIBCXX20_ONLY( __removed );
}
+#undef _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+#undef _GLIBCXX20_ONLY
+
void
#if __cplusplus >= 201103L
merge(list&& __x)
