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stack.h
1 //
2 // stack.h
3 //
4 // Copyright (C) 1996 Limit Point Systems, Inc.
5 //
6 // Author: Curtis Janssen <cljanss@limitpt.com>
7 // Maintainer: LPS
8 //
9 // This file is part of the SC Toolkit.
10 //
11 // The SC Toolkit is free software; you can redistribute it and/or modify
12 // it under the terms of the GNU Library General Public License as published by
13 // the Free Software Foundation; either version 2, or (at your option)
14 // any later version.
15 //
16 // The SC Toolkit is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // GNU Library General Public License for more details.
20 //
21 // You should have received a copy of the GNU Library General Public License
22 // along with the SC Toolkit; see the file COPYING.LIB. If not, write to
23 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 //
25 // The U.S. Government is granted a limited license as per AL 91-7.
26 //
27
28 #ifndef _util_render_stack_h
29 #define _util_render_stack_h
30
31 #include <iostream>
32
33 namespace sc {
34
35 #define STACK_MAX_STACK_SIZE 20
36 template <class T>
37 class Stack {
38 private:
39 T objects[STACK_MAX_STACK_SIZE];
40 int nobjects;
41 public:
42 Stack(): nobjects(0) {}
43 void push(const T&a) {
44 if (nobjects >= STACK_MAX_STACK_SIZE) {
45 ExEnv::errn() << "Stack: overflow" << std::endl;
46 abort();
47 }
48 objects[nobjects++] = a;
49 }
50 T pop() {
51 if (!nobjects) {
52 ExEnv::errn() << "Stack: underflow" << std::endl;
53 abort();
54 }
55 nobjects -= 1;
56 return objects[nobjects];
57 }
58 T top() const {
59 if (!nobjects) {
60 ExEnv::errn() << "Stack: underflow" << std::endl;
61 abort();
62 }
63 return objects[nobjects - 1];
64 }
65 int n() const { return nobjects; }
66 T operator[](int i) { return objects[i]; }
67 void print(std::ostream& os = ExEnv::out0()) {
68 os << "Stack (depth = " << nobjects << "):" << std::endl;
69 for (int i=0; i<nobjects; i++) {
70 os << " object " << i << ":" << std::endl;
71 objects[i]->print(os);
72 }
73 }
74 };
75
76 }
77
78 #endif
79
80 // Local Variables:
81 // mode: c++
82 // c-file-style: "CLJ"
83 // End: