Annotation of parser3/src/include/pa_stack.h, revision 1.25
1.7 paf 1: /** @file
1.8 paf 2: Parser: stack class decl.
3:
1.24 paf 4: Copyright (c) 2001-2005 ArtLebedev Group (http://www.artlebedev.com)
1.13 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_STACK_H
9: #define PA_STACK_H
1.15 paf 10:
1.25 ! paf 11: static const char * const IDENT_STACK_H="$Date: 2006/04/09 12:25:04 $";
1.1 paf 12:
1.9 parser 13: #include "pa_config_includes.h"
1.1 paf 14: #include "pa_array.h"
15:
1.7 paf 16: /// simple stack based on Array
1.18 paf 17: template<typename T> class Stack: public Array<T> {
1.1 paf 18: public:
19:
1.18 paf 20: Stack(): ftop(0) {}
1.1 paf 21:
1.18 paf 22: void push(T item) {
1.23 paf 23: if(ftop<this->count()) // cell is already allocated?
1.25 ! paf 24: this->put(ftop, item); // use it
1.1 paf 25: else
26: *this+=item; // append it
1.2 paf 27: ftop++;
1.1 paf 28: }
1.18 paf 29:
30: T pop() {
1.23 paf 31: return this->get(--ftop);
1.1 paf 32: }
33:
1.18 paf 34: bool is_empty() { return ftop==0; }
1.20 paf 35: size_t top_index() { return ftop; }
36: void set_top_index(size_t atop) { ftop=atop; }
37: T top_value() {
1.18 paf 38: assert(!is_empty());
1.23 paf 39: return this->get(ftop-1);
1.18 paf 40: }
1.2 paf 41:
1.18 paf 42: /// call this prior to collecting garbage [in unused part of stack there may be pointers(unused)]
43: void wipe_unused() {
1.23 paf 44: if(size_t above_top_size=this->fused-ftop)
45: memset(&this->felements[ftop], 0, above_top_size*sizeof(T));
1.18 paf 46: }
1.1 paf 47:
1.18 paf 48: protected:
1.1 paf 49:
1.18 paf 50: // deepest used index+1
51: size_t ftop;
1.1 paf 52: };
53:
54: #endif
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