array queue
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| 1 | + | |
| 2 | + | |
| 3 | + | |
| 4 | +#ifndef ___stdArrayQueue_cpp_H___ | |
| 5 | +#define ___stdArrayQueue_cpp_H___ | |
| 6 | + | |
| 7 | + | |
| 8 | +template <class __TYPE> | |
| 9 | +class stdArrayQueue : public stdObject { | |
| 10 | +public: | |
| 11 | + stdArrayQueue(int len) { | |
| 12 | + REF_SET(a,(NEW stdArray<__TYPE,false>(len))); | |
| 13 | + head = tail = 0; | |
| 14 | + } | |
| 15 | + ~stdArrayQueue() { | |
| 16 | + REF_SET(a,0); | |
| 17 | + } | |
| 18 | + int length() { | |
| 19 | + return a->length(); | |
| 20 | + } | |
| 21 | + int count() { | |
| 22 | + return _count; | |
| 23 | + } | |
| 24 | + void length(int len) { | |
| 25 | + int i,j,ncount; | |
| 26 | + n = NEW stdArray<__TYPE,false>(len); | |
| 27 | + if ( count < len ) | |
| 28 | + ncount = _count(); | |
| 29 | + else ncount = len; | |
| 30 | + j = 0; | |
| 31 | + i = -ncount; | |
| 32 | + for ( ; i < 0 ; i ++ , j ++ ) | |
| 33 | + n->ary[j] = get(i); | |
| 34 | + REF_SET(a,n); | |
| 35 | + tail = 0; | |
| 36 | + head = ncount; | |
| 37 | + _count = ncount; | |
| 38 | + } | |
| 39 | + __TYPE * ins() { | |
| 40 | + __TYPE ret; | |
| 41 | + _count ++; | |
| 42 | + ret = &a->ary[head++]; | |
| 43 | + if ( head >= a->length() ) | |
| 44 | + head = 0; | |
| 45 | + if ( head != tail ) { | |
| 46 | + return ret; | |
| 47 | + } | |
| 48 | + del(); | |
| 49 | + return ret; | |
| 50 | + } | |
| 51 | + void del() { | |
| 52 | + _count --; | |
| 53 | + tail ++; | |
| 54 | + if ( tail >= a->length() ) | |
| 55 | + tail = 0; | |
| 56 | + } | |
| 57 | + __TYPE * get(int pos=-1) { | |
| 58 | + if ( pos >= 0 ) | |
| 59 | + return 0; | |
| 60 | + if ( pos < -_count ) | |
| 61 | + return 0; | |
| 62 | + pos = head + pos; | |
| 63 | + for ( ; pos < 0 ; pos += a->length() ); | |
| 64 | + return a->ary[pos]; | |
| 65 | + } | |
| 66 | +protected: | |
| 67 | + stdArray<__TYPE,false> * a; | |
| 68 | + int head; | |
| 69 | + int tail; | |
| 70 | + int _count; | |
| 71 | +}; | |
| 72 | + | |
| 73 | +#endif |
modules/tinyState/trunk/src/h/ts/c++/stdArrayQueue.h