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