Softwareentwicklung in C++ - ASC

B.1 Implementationen der einzelnen Klassen 555
13 symbols ( num symbols remaining , CharDeletor : : getInstance ( ) )
14 {
15 fillVectorWithSymbols ( ) ;
16 distributeSymbolsRandomlyInVector ( ) ;
17 }
18
19 //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
20 void MemoryCardSymbolGenerator : : fillVectorWithSymbols ( )
21 {
22 uint32 count = num symbols remaining ;
23 char l e t t e r = ’A’ ;
24 while ( count−−)
25 {
26 symbols . setElementAt ( count ,new char ( l e t t e r ) ) ;
27 i f ( ( ( l e t t e r >= ’A’ ) && ( l e t t e r < ’ Z ’ ) ) | |
28 ( ( l e t t e r >= ’ a ’ ) && ( l e t t e r < ’ z ’ ) ) | |
29 ( ( l e t t e r >= ’ 0 ’ ) && ( l e t t e r < ’ 9 ’ ) ) )
30 l e t t e r ++;
31 else
32 {
33 switch ( l e t t e r )
34 {
35 case ’ Z ’ :
36 l e t t e r = ’ a ’ ;
37 break ;
38 case ’ z ’ :
39 l e t t e r = ’ 0 ’ ;
40 break ;
41 }
42 }
43 }
44 }
45
46 //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
47 void MemoryCardSymbolGenerator : : distributeSymbolsRandomlyInVector ( )
48 {
49 // d i s t r i b u t e the symbols randomly by swapping them
50 // in the vector . Please note that the f o l l o w i n g
51 // implementation i s numerically weak in r e s p e c t to
52 // the use of the random number generator .
53 uint32 count = num symbols remaining ∗ SYMBOL SWAP FACTOR;
54 srand ( count ) ; // s e t the seed ( should be done b e t t e r . . . )
55 while ( count−−)
56 {
57 int swap pos1 = rand () % num symbols remaining ;
58 int swap pos2 = rand () % num symbols remaining ;
59 char ∗ swap help = static cast(
60 symbols . getAndRemoveElementAt ( swap pos1 ) ) ;
61 symbols . setElementAt ( swap pos1 , static cast(
62 symbols . getAndRemoveElementAt (
63 swap pos2 ) ) ) ;
64 symbols . setElementAt ( swap pos2 , swap help ) ;
65 }
66 }
67
68 //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
69 char MemoryCardSymbolGenerator : : getNextSymbol ( )
70 {
71 i f ( num symbols remaining )
72 return (∗ static cast(
73 symbols . getElementAt(−−num symbols remaining ) ) ) ;
74 return ( ’ \0 ’ ) ;
75 }