hashmap.h

浙江大学的悟空嵌入式系统模拟器

        } \
 \
        node = new Node( value ); \
        node->m_nxt = m_table[bucket]; \
        m_table[bucket] = node; \
 \
        /* must be after the node is inserted */ \
        ++m_items; \
        if( SHOULD_GROW( m_tableBuckets, m_items ) ) \
            ResizeTable( m_tableBuckets ); \
 \
        return node; \
    } \
 \
    /* returns NULL if not found */ \
    Node** GetNodePtr( const const_key_type& key ) const \
    { \
        unsigned long hash = m_hasher( key ); \
        Node** node = &m_table[hash % m_tableBuckets]; \
 \
        while( *node ) \
        { \
            if( m_equals( m_getKey( (*node)->m_value ), key ) ) \
                return node; \
            node = (Node**)&(*node)->m_nxt; \
        } \
 \
        return 0; \
    } \
 \
    /* returns NULL if not found */ \
    /* expressing it in terms of GetNodePtr is 5-8% slower :-( */ \
    Node* GetNode( const const_key_type& key ) const \
    { \
        unsigned long hash = m_hasher( key ); \
        Node* node = m_table[hash % m_tableBuckets]; \
 \
        while( node ) \
        { \
            if( m_equals( m_getKey( node->m_value ), key ) ) \
                return node; \
            node = node->m_next(); \
        } \
 \
        return 0; \
    } \
 \
    void ResizeTable( size_t newSize ) \
    { \
        newSize = GetNextPrime( newSize ); \
        Node** srcTable = m_table; \
        size_t srcBuckets = m_tableBuckets; \
        m_table = (Node**)AllocTable( newSize ); \
        m_tableBuckets = newSize; \
 \
        CopyHashTable( (_wxHashTable_NodeBase**)srcTable, srcBuckets, \
                       this, (_wxHashTable_NodeBase**)m_table, \
                       (BucketFromNode)GetBucketForNode,\
                       (ProcessNode)&DummyProcessNode ); \
        free(srcTable); \
    } \
 \
    /* this must be called _after_ m_table has been cleaned */ \
    void HashCopy( const Self& ht ) \
    { \
        ResizeTable( ht.size() ); \
        CopyHashTable( (_wxHashTable_NodeBase**)ht.m_table, ht.m_tableBuckets,\
                       (_wxHashTableBase2*)this, \
                       (_wxHashTable_NodeBase**)m_table, \
                       (BucketFromNode)GetBucketForNode, \
                       (ProcessNode)CopyNode ); \
    } \
};

// defines an STL-like pair class CLASSNAME storing two fields: first of type
// KEY_T and second of type VALUE_T
#define _WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME, CLASSEXP ) \
CLASSEXP CLASSNAME \
{ \
public: \
    typedef KEY_T t1; \
    typedef VALUE_T t2; \
    typedef const KEY_T const_t1; \
    typedef const VALUE_T const_t2; \
 \
    CLASSNAME( const const_t1& f, const const_t2& s ):first(t1(f)),second(t2(s)) {} \
    CLASSNAME( const const_t1& f ):first(t1(f)),second(t2()) {} \
 \
    t1 first; \
    t2 second; \
};

// defines the class CLASSNAME returning the key part (of type KEY_T) from a
// pair of type PAIR_T
#define _WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, PAIR_T, CLASSNAME, CLASSEXP ) \
CLASSEXP CLASSNAME \
{ \
    typedef KEY_T key_type; \
    typedef PAIR_T pair_type; \
    typedef const key_type const_key_type; \
    typedef const pair_type const_pair_type; \
    typedef const_key_type& const_key_reference; \
    typedef const_pair_type& const_pair_reference; \
public: \
    CLASSNAME() { } \
    const_key_reference operator()( const_pair_reference pair ) const { return pair.first; }\
    \
    /* 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; } \
};

// grow/shrink predicates
inline bool never_grow( size_t, size_t ) { return FALSE; }
inline bool never_shrink( size_t, size_t ) { return FALSE; }
inline bool grow_lf70( size_t buckets, size_t items )
{
    return float(items)/float(buckets) >= 0.85;
}

// ----------------------------------------------------------------------------
// hashing and comparison functors
// ----------------------------------------------------------------------------

// NB: implementation detail: all of these classes must have dummy assignment
//     operators to suppress warnings about "statement with no effect" from gcc
//     in the hash table class assignment operator (where they're assigned)

// integer types
class WXDLLEXPORT wxIntegerHash
{
public:
    wxIntegerHash() { }
    unsigned long operator()( long x ) const { return (unsigned long)x; }
    unsigned long operator()( unsigned long x ) const { return x; }
    unsigned long operator()( int x ) const { return (unsigned long)x; }
    unsigned long operator()( unsigned int x ) const { return x; }
    unsigned long operator()( short x ) const { return (unsigned long)x; }
    unsigned long operator()( unsigned short x ) const { return x; }

    wxIntegerHash& operator=(const wxIntegerHash&) { return *this; }
};

class WXDLLEXPORT wxIntegerEqual
{
public:
    wxIntegerEqual() { }
    bool operator()( long a, long b ) const { return a == b; }
    bool operator()( unsigned long a, unsigned long b ) const { return a == b; }
    bool operator()( int a, int b ) const { return a == b; }
    bool operator()( unsigned int a, unsigned int b ) const { return a == b; }
    bool operator()( short a, short b ) const { return a == b; }
    bool operator()( unsigned short a, unsigned short b ) const { return a == b; }

    wxIntegerEqual& operator=(const wxIntegerEqual&) { return *this; }
};

// pointers
class WXDLLEXPORT wxPointerHash
{
public:
    wxPointerHash() { }

    // TODO: this might not work well on architectures with 64 bit pointers but
    //       32 bit longs, we should use % ULONG_MAX there
    unsigned long operator()( const void* k ) const { return (unsigned long)k; }

    wxPointerHash& operator=(const wxPointerHash&) { return *this; }
};

class WXDLLEXPORT wxPointerEqual
{
public:
    wxPointerEqual() { }
    bool operator()( const void* a, const void* b ) const { return a == b; }

    wxPointerEqual& operator=(const wxPointerEqual&) { return *this; }
};

// wxString, char*, wxChar*
class WXDLLEXPORT wxStringHash
{
public:
    wxStringHash() {}
    unsigned long operator()( const wxString& x ) const
        { return wxCharStringHash( x.c_str() ); }
    unsigned long operator()( const wxChar* x ) const
        { return wxCharStringHash( x ); }
    static unsigned long wxCharStringHash( const wxChar* );
#if wxUSE_UNICODE
    unsigned long operator()( const char* x ) const
        { return charStringHash( x ); }
    static unsigned long charStringHash( const char* );
#endif // wxUSE_UNICODE

    wxStringHash& operator=(const wxStringHash&) { return *this; }
};

class WXDLLEXPORT wxStringEqual
{
public:
    wxStringEqual() {}
    bool operator()( const wxString& a, const wxString& b ) const
        { return a == b; }
    bool operator()( const wxChar* a, const wxChar* b ) const
        { return wxStrcmp( a, b ) == 0; }
#if wxUSE_UNICODE
    bool operator()( const char* a, const char* b ) const
        { return strcmp( a, b ) == 0; }
#endif // wxUSE_UNICODE

    wxStringEqual& operator=(const wxStringEqual&) { return *this; }
};

#define _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP ) \
_WX_DECLARE_PAIR( KEY_T, VALUE_T, CLASSNAME##_wxImplementation_Pair, CLASSEXP ) \
_WX_DECLARE_HASH_MAP_KEY_EX( KEY_T, CLASSNAME##_wxImplementation_Pair, CLASSNAME##_wxImplementation_KeyEx, CLASSEXP ) \
_WX_DECLARE_HASHTABLE( CLASSNAME##_wxImplementation_Pair, KEY_T, HASH_T, CLASSNAME##_wxImplementation_KeyEx, KEY_EQ_T, CLASSNAME##_wxImplementation_HashTable, CLASSEXP, grow_lf70, never_shrink ) \
CLASSEXP CLASSNAME:public CLASSNAME##_wxImplementation_HashTable \
{ \
public: \
    typedef VALUE_T mapped_type; \
 \
    CLASSNAME( size_type hint = 100, hasher hf = hasher(), key_equal eq = key_equal() ) \
        : CLASSNAME##_wxImplementation_HashTable( hint, hf, eq, CLASSNAME##_wxImplementation_KeyEx() ) {} \
 \
    mapped_type& operator[]( const const_key_type& key ) \
    { \
        return GetOrCreateNode( CLASSNAME##_wxImplementation_Pair( key ) )->m_value.second; \
    } \
 \
    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 ); \
    } \
 \
    void insert( const value_type& v ) { (*this)[v.first] = v.second; } \
 \
    size_type erase( const key_type& k ) \
        { return CLASSNAME##_wxImplementation_HashTable::erase( k ); } \
    void erase( const iterator& it ) { erase( it->first ); } \
    void erase( const const_iterator& it ) { erase( it->first ); } \
 \
    /* count() == 0 | 1 */ \
    size_type count( const const_key_type& key ) \
        { return GetNode( key ) ? 1 : 0; } \
}

// these macros are to be used in the user code
#define WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
    _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, class )

#define WX_DECLARE_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
    _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
                          CLASSNAME, class )

#define WX_DECLARE_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
    _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
                          CLASSNAME, class )

// and these do exactly the same thing but should be used inside the
// library
#define WX_DECLARE_EXPORTED_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME) \
    _WX_DECLARE_HASH_MAP( KEY_T, VALUE_T, HASH_T, KEY_EQ_T, CLASSNAME, class WXDLLEXPORT )

#define WX_DECLARE_EXPORTED_STRING_HASH_MAP( VALUE_T, CLASSNAME ) \
    _WX_DECLARE_HASH_MAP( wxString, VALUE_T, wxStringHash, wxStringEqual, \
                          CLASSNAME, class WXDLLEXPORT )

#define WX_DECLARE_EXPORTED_VOIDPTR_HASH_MAP( VALUE_T, CLASSNAME ) \
    _WX_DECLARE_HASH_MAP( void*, VALUE_T, wxPointerHash, wxPointerEqual, \
                          CLASSNAME, class WXDLLEXPORT )

#endif // _WX_HASHMAP_H_