Annotation of parser3/src/include/pa_stack.h, revision 1.7
1.7 ! paf 1: /** @file
1.5 paf 2: Parser
3: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.6 paf 4: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.5 paf 5:
1.7 ! paf 6: $Id: pa_stack.h,v 1.6 2001/03/11 08:16:33 paf Exp $
1.1 paf 7: */
8:
9: #ifndef PA_STACK_H
10: #define PA_STACK_H
11:
12: #include "pa_array.h"
13:
1.7 ! paf 14: /// simple stack based on Array
1.1 paf 15: class Stack : public Array {
16: public:
17:
1.2 paf 18: Stack(Pool& apool) : Array(apool), ftop(0) {
1.1 paf 19: }
20:
21: void push(Item *item) {
1.2 paf 22: if(ftop<size()) // cell is already allocated?
23: put(ftop, item); // use it
1.1 paf 24: else
25: *this+=item; // append it
1.2 paf 26: ftop++;
1.1 paf 27: }
28: Item *pop() {
1.2 paf 29: return get(--ftop);
1.1 paf 30: }
31:
1.4 paf 32: int top_index() { return ftop-1; }
33: Item *top_value() { return get(top_index()); }
1.2 paf 34:
1.1 paf 35: private:
36:
37: // deepest used index
1.2 paf 38: int ftop;
1.1 paf 39:
40: };
41:
42: #endif
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