7a7fa93b0d
This reverts r70556, i.e. removes the scope operators added by it to all
WX_DECLARE_HASH_{MAP,SET} macros, and implements a workaround for the problem
due to the use of empty base class optimization in g++ 4.7 standard library
implementations inside the macros themselves by prepending the hasher and
comparator classes with explicit "struct".
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72297 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
200 lines
11 KiB
C++
200 lines
11 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/hashset.h
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// Purpose: wxHashSet class
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// Author: Mattia Barbon
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// Modified by:
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// Created: 11/08/2003
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// RCS-ID: $Id$
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// Copyright: (c) Mattia Barbon
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_HASHSET_H_
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#define _WX_HASHSET_H_
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#include "wx/hashmap.h"
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// see comment in wx/hashmap.h which also applies to different standard hash
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// set classes
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#if wxUSE_STD_CONTAINERS && \
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(defined(HAVE_STD_UNORDERED_SET) || defined(HAVE_TR1_UNORDERED_SET))
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#if defined(HAVE_STD_UNORDERED_SET)
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#include <unordered_set>
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#define WX_HASH_SET_BASE_TEMPLATE std::unordered_set
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#elif defined(HAVE_TR1_UNORDERED_SET)
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#include <tr1/unordered_set>
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#define WX_HASH_SET_BASE_TEMPLATE std::tr1::unordered_set
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#else
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#error Update this code: unordered_set is available, but I do not know where.
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#endif
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#elif wxUSE_STD_CONTAINERS && defined(HAVE_STL_HASH_MAP)
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#if defined(HAVE_EXT_HASH_MAP)
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#include <ext/hash_set>
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#elif defined(HAVE_HASH_MAP)
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#include <hash_set>
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#endif
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#define WX_HASH_SET_BASE_TEMPLATE WX_HASH_MAP_NAMESPACE::hash_set
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#endif // different hash_set/unordered_set possibilities
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#ifdef WX_HASH_SET_BASE_TEMPLATE
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// we need to define the class declared by _WX_DECLARE_HASH_SET as a class and
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// not a typedef to allow forward declaring it
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#define _WX_DECLARE_HASH_SET_IMPL( KEY_T, HASH_T, KEY_EQ_T, PTROP, CLASSNAME, CLASSEXP ) \
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CLASSEXP CLASSNAME \
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: public WX_HASH_SET_BASE_TEMPLATE< KEY_T, HASH_T, KEY_EQ_T > \
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{ \
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public: \
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explicit CLASSNAME(size_type n = 3, \
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const hasher& h = hasher(), \
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const key_equal& ke = key_equal(), \
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const allocator_type& a = allocator_type()) \
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: WX_HASH_SET_BASE_TEMPLATE< KEY_T, HASH_T, KEY_EQ_T >(n, h, ke, a) \
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{} \
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template <class InputIterator> \
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CLASSNAME(InputIterator f, InputIterator l, \
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const hasher& h = hasher(), \
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const key_equal& ke = key_equal(), \
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const allocator_type& a = allocator_type()) \
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: WX_HASH_SET_BASE_TEMPLATE< KEY_T, HASH_T, KEY_EQ_T >(f, l, h, ke, a)\
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{} \
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CLASSNAME(const WX_HASH_SET_BASE_TEMPLATE< KEY_T, HASH_T, KEY_EQ_T >& s) \
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: WX_HASH_SET_BASE_TEMPLATE< KEY_T, HASH_T, KEY_EQ_T >(s) \
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{} \
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}
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// In some standard library implementations (in particular, the libstdc++ that
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// ships with g++ 4.7), std::unordered_set inherits privately from its hasher
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// and comparator template arguments for purposes of empty base optimization.
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// As a result, in the declaration of a class deriving from std::unordered_set
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// the names of the hasher and comparator classes are interpreted as naming
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// the base class which is inaccessible.
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// The workaround is to prefix the class names with 'struct'; however, don't
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// do this on MSVC because it causes a warning there if the class was
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// declared as a 'class' rather than a 'struct' (and MSVC's std::unordered_set
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// implementation does not suffer from the access problem).
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#ifdef _MSC_VER
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#define WX_MAYBE_PREFIX_WITH_STRUCT(STRUCTNAME) STRUCTNAME
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#else
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#define WX_MAYBE_PREFIX_WITH_STRUCT(STRUCTNAME) struct STRUCTNAME
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#endif
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#define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, PTROP, CLASSNAME, CLASSEXP ) \
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_WX_DECLARE_HASH_SET_IMPL( \
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KEY_T, \
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WX_MAYBE_PREFIX_WITH_STRUCT(HASH_T), \
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WX_MAYBE_PREFIX_WITH_STRUCT(KEY_EQ_T), \
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PTROP, \
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CLASSNAME, \
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CLASSEXP)
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#else // no appropriate STL class, use our own implementation
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// this is a complex way of defining an easily inlineable identity function...
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#define _WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME, CLASSEXP ) \
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CLASSEXP CLASSNAME \
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{ \
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typedef KEY_T key_type; \
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typedef const key_type const_key_type; \
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typedef const_key_type& const_key_reference; \
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public: \
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CLASSNAME() { } \
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const_key_reference operator()( const_key_reference key ) const \
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{ return key; } \
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\
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/* the dummy assignment operator is needed to suppress compiler */ \
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/* warnings from hash table class' operator=(): gcc complains about */ \
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/* "statement with no effect" without it */ \
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CLASSNAME& operator=(const CLASSNAME&) { return *this; } \
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};
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#define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, PTROP, CLASSNAME, CLASSEXP )\
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_WX_DECLARE_HASH_SET_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
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_WX_DECLARE_HASHTABLE( KEY_T, KEY_T, HASH_T, \
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CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, PTROP, \
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CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
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CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable \
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{ \
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public: \
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_WX_DECLARE_PAIR( iterator, bool, Insert_Result, CLASSEXP ) \
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\
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wxEXPLICIT CLASSNAME( size_type hint = 100, hasher hf = hasher(), \
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key_equal eq = key_equal() ) \
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: CLASSNAME##_wxImplementation_HashTable( hint, hf, eq, \
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CLASSNAME##_wxImplementation_KeyEx() ) {} \
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\
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Insert_Result insert( const key_type& key ) \
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{ \
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bool created; \
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Node *node = GetOrCreateNode( key, created ); \
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return Insert_Result( iterator( node, this ), created ); \
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} \
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\
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const_iterator find( const const_key_type& key ) const \
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{ \
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return const_iterator( GetNode( key ), this ); \
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} \
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\
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iterator find( const const_key_type& key ) \
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{ \
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return iterator( GetNode( key ), this ); \
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} \
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\
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size_type erase( const key_type& k ) \
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{ return CLASSNAME##_wxImplementation_HashTable::erase( k ); } \
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void erase( const iterator& it ) { erase( *it ); } \
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void erase( const const_iterator& it ) { erase( *it ); } \
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\
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/* count() == 0 | 1 */ \
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size_type count( const const_key_type& key ) const \
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{ return GetNode( key ) ? 1 : 0; } \
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}
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#endif // STL/wx implementations
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// these macros are to be used in the user code
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#define WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
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_WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, wxPTROP_NORMAL, CLASSNAME, class )
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// and these do exactly the same thing but should be used inside the
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// library
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#define WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
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_WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, wxPTROP_NORMAL, CLASSNAME, DECL )
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#define WX_DECLARE_EXPORTED_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
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WX_DECLARE_HASH_SET_WITH_DECL( KEY_T, HASH_T, KEY_EQ_T, \
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CLASSNAME, class WXDLLIMPEXP_CORE )
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// Finally these versions allow to define hash sets of non-objects (including
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// pointers, hence the confusing but wxArray-compatible name) without
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// operator->() which can't be used for them. This is mostly used inside the
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// library itself to avoid warnings when using such hash sets with some less
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// common compilers (notably Sun CC).
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#define WX_DECLARE_HASH_SET_PTR( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME) \
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_WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, wxPTROP_NOP, CLASSNAME, class )
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#define WX_DECLARE_HASH_SET_WITH_DECL_PTR( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, DECL) \
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_WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, wxPTROP_NOP, CLASSNAME, DECL )
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// delete all hash elements
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//
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// NB: the class declaration of the hash elements must be visible from the
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// place where you use this macro, otherwise the proper destructor may not
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// be called (a decent compiler should give a warning about it, but don't
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// count on it)!
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#define WX_CLEAR_HASH_SET(type, hashset) \
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{ \
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type::iterator it, en; \
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for( it = (hashset).begin(), en = (hashset).end(); it != en; ++it ) \
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delete *it; \
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(hashset).clear(); \
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}
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#endif // _WX_HASHSET_H_
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