blob: 9a9269ed696136efbda0c3dd1cd79eb6f37abd5d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef txStack_h___
#define txStack_h___
#include "nsTArray.h"
class txStack : private nsTArray<void*> {
public:
/**
* Returns the specified object from the top of this stack,
* without removing it from the stack.
*
* @return a pointer to the object that is the top of this stack.
*/
inline void* peek() {
NS_ASSERTION(!isEmpty(), "peeking at empty stack");
return !isEmpty() ? ElementAt(Length() - 1) : nullptr;
}
/**
* Adds the specified object to the top of this stack.
*
* @param obj a pointer to the object that is to be added to the
* top of this stack.
*/
inline void push(void* aObject) { AppendElement(aObject); }
/**
* Removes and returns the specified object from the top of this
* stack.
*
* @return a pointer to the object that was the top of this stack.
*/
inline void* pop() {
void* object = nullptr;
NS_ASSERTION(!isEmpty(), "popping from empty stack");
if (!isEmpty()) {
object = PopLastElement();
}
return object;
}
/**
* Returns true if there are no objects in the stack.
*
* @return true if there are no objects in the stack.
*/
inline bool isEmpty() { return IsEmpty(); }
/**
* Returns the number of elements in the Stack.
*
* @return the number of elements in the Stack.
*/
inline int32_t size() { return Length(); }
private:
friend class txStackIterator;
};
class txStackIterator {
public:
/**
* Creates an iterator for the given stack.
*
* @param aStack the stack to create an iterator for.
*/
inline explicit txStackIterator(txStack* aStack)
: mStack(aStack), mPosition(0) {}
/**
* Returns true if there is more objects on the stack.
*
* @return .
*/
inline bool hasNext() { return (mPosition < mStack->Length()); }
/**
* Returns the next object pointer from the stack.
*
* @return .
*/
inline void* next() {
if (mPosition == mStack->Length()) {
return nullptr;
}
return mStack->ElementAt(mPosition++);
}
private:
txStack* mStack;
uint32_t mPosition;
};
#endif /* txStack_h___ */
|