请帮我说一说
有一个类:
class TRecord
{
public:
TRecord( const string& word, unsigned lineNum );
int operator == ( const TRecord& record ) const;
int operator < ( const TRecord& record ) const;
int AddLineRef( unsigned lineNum );
string GetWord() const;
unsigned GetPageCount() const;
friend ostream& operator << ( ostream&, const TRecord& );
private:
string Word;
TSVectorImp<unsigned> LineRef;
};
请问怎么理解:
int operator == ( const TRecord& record ) const;
中的 operator ==;const;还有 冒号 :怎么样用? 各代表什么?
我看帮助文件没有看明白。
还有以下几名请问怎么理解:
template <class T> Directory<T>::Directory( const char *FileSpec ) :
Array( 10, 0, 5 )
{ }
下面有一段代码:
template <class T> class Directory
{
public:
Directory( const char *FileSpec );
void Show();
private:
TISArrayAsVector<T> Array;
};
template <class T> Directory<T>::Directory( const char *FileSpec ) :
Array( 10, 0, 5 )
{
struct ffblk FileBlock;
int Done = findfirst( FileSpec, &FileBlock, 0 );
while( !Done )
{
Array.Add( new T(FileBlock) );
Done = findnext( &FileBlock );
}
}
static void ShowBlock( FilesByName &blk, void * )
{
cout << blk << endl;
}
static void ShowBlock( FilesByDate &blk, void * )
{
cout << blk << endl;
}
static void ShowBlock( FilesBySize &blk, void * )
{
cout << blk << endl;
}
template <class T> inline void Directory<T>::Show()
{
Array.ForEach( ShowBlock, 0 );
}
void SortByName( const char *FileSpec )
{
Directory<FilesByName> dir( FileSpec );
dir.Show();
}
void SortByDate( const char *FileSpec )
{
Directory<FilesByDate> dir( FileSpec );
dir.Show();
}
void SortBySize( const char *FileSpec )
{
Directory<FilesBySize> dir( FileSpec );
dir.Show();
}
int main( int argc, char *argv[] )
{
if( argc < 2 || argc > 3 )
{
cerr << "Usage: directory [options] filespec" << endl << endl;
cerr << "Options:" << endl;
cerr << "\t-sd\tsort by date" << endl;
cerr << "\t-sn\tsort by name" << endl;
cerr << "\t-ss\tsort by size" << endl;
exit(1);
}
if( argc != 3 )
SortByName( argv[1] );
else
{
if( strcmp( argv[1], "-sn" ) == 0 )
SortByName( argv[2] );
else if( strcmp( argv[1], "-sd" ) == 0 )
SortByDate( argv[2] );
else if( strcmp( argv[1], "-ss" ) == 0 )
SortBySize( argv[2] );
}
return 0;
}