libstdc++: Review _Local_iterator/_Local_const_iterator implementations.

_Local_iterator_base inherits _Node_iterator_base and so share the same
comparison operators. It avoids to expose special method _M_curr for debug
mode to compare such iterators.

libstdc++-v3/ChangeLog:

	* include/bits/hashtable_policy.h (_Node_iterator_base()): New.
	(operator==(const _Node_iterator_base&, const _Node_iterator_base&)):
	Make hidden friend.
	(operator!=(const _Node_iterator_base&, const _Node_iterator_base&)):
	Make hidden friend.
	(_Local_iterator_base<>): Inherits _Node_iterator_base.
	(_Local_iterator_base<>::_M_cur): Remove.
	(_Local_iterator_base<>::_M_curr()): Remove.
	(operator==(const _Local_iterator_base&, const _Local_iterator_base&)):
	Remove.
	(operator!=(const _Local_iterator_base&, const _Local_iterator_base&)):
	Remove.
	* include/debug/unordered_map (unordered_map<>::_M_invalidate): Adapt.
	(unordered_multimap<>::_M_invalidate): Adapt.
	* include/debug/unordered_set (unordered_set<>::_M_invalidate): Adapt.
	(unordered_multiset<>::_M_invalidate): Adapt.
This commit is contained in:
François Dumont 2020-01-20 19:23:09 +01:00
parent 1722e2013f
commit acc1d1a954
3 changed files with 39 additions and 61 deletions

View File

@ -291,28 +291,27 @@ namespace __detail
__node_type* _M_cur;
_Node_iterator_base() = default;
_Node_iterator_base(__node_type* __p) noexcept
: _M_cur(__p) { }
void
_M_incr() noexcept
{ _M_cur = _M_cur->_M_next(); }
friend bool
operator==(const _Node_iterator_base& __x, const _Node_iterator_base& __y)
noexcept
{ return __x._M_cur == __y._M_cur; }
#if __cpp_impl_three_way_comparison < 201907L
friend bool
operator!=(const _Node_iterator_base& __x, const _Node_iterator_base& __y)
noexcept
{ return __x._M_cur != __y._M_cur; }
#endif
};
template<typename _Value, bool _Cache_hash_code>
inline bool
operator==(const _Node_iterator_base<_Value, _Cache_hash_code>& __x,
const _Node_iterator_base<_Value, _Cache_hash_code >& __y)
noexcept
{ return __x._M_cur == __y._M_cur; }
template<typename _Value, bool _Cache_hash_code>
inline bool
operator!=(const _Node_iterator_base<_Value, _Cache_hash_code>& __x,
const _Node_iterator_base<_Value, _Cache_hash_code>& __y)
noexcept
{ return __x._M_cur != __y._M_cur; }
/// Node iterators, used to iterate through all the hashtable.
template<typename _Value, bool __constant_iterators, bool __cache>
struct _Node_iterator
@ -334,7 +333,7 @@ namespace __detail
const _Value&, _Value&>::type;
_Node_iterator() noexcept
: __base_type(0) { }
: __base_type(nullptr) { }
explicit
_Node_iterator(__node_type* __p) noexcept
@ -382,7 +381,7 @@ namespace __detail
typedef const _Value& reference;
_Node_const_iterator() noexcept
: __base_type(0) { }
: __base_type(nullptr) { }
explicit
_Node_const_iterator(__node_type* __p) noexcept
@ -1431,9 +1430,11 @@ namespace __detail
struct _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, true>
: private _Hashtable_ebo_helper<0, _H2>
, _Node_iterator_base<_Value, true>
{
protected:
using __base_type = _Hashtable_ebo_helper<0, _H2>;
using __base_node_iter = _Node_iterator_base<_Value, true>;
using __hash_code_base = _Hash_code_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, true>;
@ -1441,31 +1442,27 @@ namespace __detail
_Local_iterator_base(const __hash_code_base& __base,
_Hash_node<_Value, true>* __p,
std::size_t __bkt, std::size_t __bkt_count)
: __base_type(__base._M_h2()),
_M_cur(__p), _M_bucket(__bkt), _M_bucket_count(__bkt_count) { }
: __base_type(__base._M_h2()), __base_node_iter(__p)
, _M_bucket(__bkt), _M_bucket_count(__bkt_count) { }
void
_M_incr()
{
_M_cur = _M_cur->_M_next();
if (_M_cur)
__base_node_iter::_M_incr();
if (this->_M_cur)
{
std::size_t __bkt
= __base_type::_M_get()(_M_cur->_M_hash_code,
_M_bucket_count);
= __base_type::_M_get()(this->_M_cur->_M_hash_code,
_M_bucket_count);
if (__bkt != _M_bucket)
_M_cur = nullptr;
this->_M_cur = nullptr;
}
}
_Hash_node<_Value, true>* _M_cur;
std::size_t _M_bucket;
std::size_t _M_bucket_count;
public:
const void*
_M_curr() const { return _M_cur; } // for equality ops
std::size_t
_M_get_bucket() const { return _M_bucket; } // for debug mode
};
@ -1513,17 +1510,19 @@ namespace __detail
struct _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, false>
: __hash_code_for_local_iter<_Key, _Value, _ExtractKey, _H1, _H2, _Hash>
, _Node_iterator_base<_Value, false>
{
protected:
using __hash_code_base = _Hash_code_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, false>;
using __node_iter_base = _Node_iterator_base<_Value, false>;
_Local_iterator_base() : _M_bucket_count(-1) { }
_Local_iterator_base(const __hash_code_base& __base,
_Hash_node<_Value, false>* __p,
std::size_t __bkt, std::size_t __bkt_count)
: _M_cur(__p), _M_bucket(__bkt), _M_bucket_count(__bkt_count)
: __node_iter_base(__p), _M_bucket(__bkt), _M_bucket_count(__bkt_count)
{ _M_init(__base); }
~_Local_iterator_base()
@ -1533,8 +1532,8 @@ namespace __detail
}
_Local_iterator_base(const _Local_iterator_base& __iter)
: _M_cur(__iter._M_cur), _M_bucket(__iter._M_bucket),
_M_bucket_count(__iter._M_bucket_count)
: __node_iter_base(__iter), _M_bucket(__iter._M_bucket)
, _M_bucket_count(__iter._M_bucket_count)
{
if (_M_bucket_count != -1)
_M_init(*__iter._M_h());
@ -1545,7 +1544,7 @@ namespace __detail
{
if (_M_bucket_count != -1)
_M_destroy();
_M_cur = __iter._M_cur;
this->_M_cur = __iter._M_cur;
_M_bucket = __iter._M_bucket;
_M_bucket_count = __iter._M_bucket_count;
if (_M_bucket_count != -1)
@ -1556,17 +1555,16 @@ namespace __detail
void
_M_incr()
{
_M_cur = _M_cur->_M_next();
if (_M_cur)
__node_iter_base::_M_incr();
if (this->_M_cur)
{
std::size_t __bkt = this->_M_h()->_M_bucket_index(_M_cur,
std::size_t __bkt = this->_M_h()->_M_bucket_index(this->_M_cur,
_M_bucket_count);
if (__bkt != _M_bucket)
_M_cur = nullptr;
this->_M_cur = nullptr;
}
}
_Hash_node<_Value, false>* _M_cur;
std::size_t _M_bucket;
std::size_t _M_bucket_count;
@ -1578,31 +1576,10 @@ namespace __detail
_M_destroy() { this->_M_h()->~__hash_code_base(); }
public:
const void*
_M_curr() const { return _M_cur; } // for equality ops and debug mode
std::size_t
_M_get_bucket() const { return _M_bucket; } // for debug mode
};
template<typename _Key, typename _Value, typename _ExtractKey,
typename _H1, typename _H2, typename _Hash, bool __cache>
inline bool
operator==(const _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, __cache>& __x,
const _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, __cache>& __y)
{ return __x._M_curr() == __y._M_curr(); }
template<typename _Key, typename _Value, typename _ExtractKey,
typename _H1, typename _H2, typename _Hash, bool __cache>
inline bool
operator!=(const _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, __cache>& __x,
const _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, __cache>& __y)
{ return __x._M_curr() != __y._M_curr(); }
/// local iterators
template<typename _Key, typename _Value, typename _ExtractKey,
typename _H1, typename _H2, typename _Hash,
@ -1615,6 +1592,7 @@ namespace __detail
using __base_type = _Local_iterator_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash, __cache>;
using __hash_code_base = typename __base_type::__hash_code_base;
public:
typedef _Value value_type;
typedef typename std::conditional<__constant_iterators,

View File

@ -630,7 +630,7 @@ namespace __debug
[__victim](_Base_const_iterator __it) { return __it == __victim; });
this->_M_invalidate_local_if(
[__victim](_Base_const_local_iterator __it)
{ return __it._M_curr() == __victim._M_cur; });
{ return __it == __victim; });
}
_Base_iterator
@ -1246,7 +1246,7 @@ namespace __debug
[__victim](_Base_const_iterator __it) { return __it == __victim; });
this->_M_invalidate_local_if(
[__victim](_Base_const_local_iterator __it)
{ return __it._M_curr() == __victim._M_cur; });
{ return __it == __victim; });
}
_Base_iterator

View File

@ -515,7 +515,7 @@ namespace __debug
[__victim](_Base_const_iterator __it) { return __it == __victim; });
this->_M_invalidate_local_if(
[__victim](_Base_const_local_iterator __it)
{ return __it._M_curr() == __victim._M_cur; });
{ return __it == __victim; });
}
_Base_iterator
@ -1085,7 +1085,7 @@ namespace __debug
[__victim](_Base_const_iterator __it) { return __it == __victim; });
this->_M_invalidate_local_if(
[__victim](_Base_const_local_iterator __it)
{ return __it._M_curr() == __victim._M_cur; });
{ return __it == __victim; });
}
_Base_iterator