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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
// Copyright (C) 2003 Davis E. King (davisking@users.sourceforge.net)
// License: Boost Software License See LICENSE.txt for the full license.
#undef DLIB_STACK_KERNEl_ABSTRACT_
#ifdef DLIB_STACK_KERNEl_ABSTRACT_
#include "../interfaces/enumerable.h"
#include "../interfaces/remover.h"
#include "../serialize.h"
#include "../memory_manager/memory_manager_kernel_abstract.h"
namespace dlib
{
template <
typename T,
typename mem_manager = memory_manager<char>::kernel_1a
>
class stack : public enumerable<T>,
public remover<T>
{
/*!
REQUIREMENTS ON T
T must be swappable by a global swap() and
T must have a default constructor
REQUIREMENTS ON mem_manager
must be an implementation of memory_manager/memory_manager_kernel_abstract.h or
must be an implementation of memory_manager_global/memory_manager_global_kernel_abstract.h or
must be an implementation of memory_manager_stateless/memory_manager_stateless_kernel_abstract.h
mem_manager::type can be set to anything.
POINTERS AND REFERENCES TO INTERNAL DATA
swap() and current() functions do not invalidate pointers
or references to internal data.
All other functions have no such guarantee.
INITIAL VALUE
size() == 0
ENUMERATION ORDER
The enumerator will iterate over the elements in the stack in the
same order they would be removed in by repeated calls to pop().
(e.g. current() would be the first element enumerated)
WHAT THIS OBJECT REPRESENTS
This is a last in first out stack containing items of type T.
e.g. if the stack is {b,c,d,e} then a is put in
the stack becomes {a,b,c,d,e} and then pop takes a back out
returning the stack to {b,c,d,e}
Also note that unless specified otherwise, no member functions
of this object throw exceptions.
!*/
public:
typedef T type;
typedef mem_manager mem_manager_type;
stack (
);
/*!
ensures
- #*this is properly initialized
throws
- std::bad_alloc or any exception thrown by T's constructor
!*/
virtual ~stack (
);
/*!
ensures
- all memory associated with *this has been released
!*/
void clear(
);
/*!
ensures
- #*this has its initial value
throws
- std::bad_alloc or any exception thrown by T's constructor
if this exception is thrown then *this is unusable
until clear() is called and succeeds
!*/
void push (
T& item
);
/*!
ensures
- item has been swapped onto the top of the stack
- #current() == item
- #item has an initial value for its type
- #size() == size() + 1
- #at_start() == true
throws
- std::bad_alloc or any exception thrown by T's constructor
if push() throws then it has no effect
!*/
void pop (
T& item
);
/*!
requires
- size() != 0
ensures
- #size() == size() - 1
- #item == current()
i.e. the top element of *this has been removed and swapped
into #item
- #at_start() == true
!*/
T& current (
);
/*!
requires
- size() != 0
ensures
- returns a const reference to the element at the top of *this
!*/
const T& current (
) const;
/*!
requires
- size() != 0
ensures
- returns a non-const reference to the element at the top of *this
!*/
void swap (
stack& item
);
/*!
ensures
- swaps *this and item
!*/
private:
// restricted functions
stack(stack&); // copy constructor
stack& operator=(stack&); // assignment operator
};
template <
typename T,
typename mem_manager
>
inline void swap (
stack<T,mem_manager>& a,
stack<T,mem_manager>& b
) { a.swap(b); }
/*!
provides a global swap function
!*/
template <
typename T,
typename mem_manager
>
void deserialize (
stack<T,mem_manager>& item,
std::istream& in
);
/*!
provides deserialization support
!*/
}
#endif // DLIB_STACK_KERNEl_ABSTRACT_