blob: a9a7003be77514a2b0a7f2ffd331a81b7bea139f (
plain) (
blame)
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
|
// FILE: queue2.h (part of the namespace
// TEMPLATE CLASS PROVIDED: queue<Item> (a queue of items)
//
// TEMPLATE PARAMETER, TYPEDEFS and MEMBER CONSTANTS for the stack<Item> class:
// The template parameter, Item, is the data type of the items in the queue,
// also defined as queue<Item>::value_type. It may be any of the C++ built-in
// types (int, char, etc.), or a class with a default constructor, a copy
// constructor, and an assignment operator. The definition
// queue<Item>::size_type is the data type of any variable that keeps track of
// how many items are in a queue.
// NOTE:
// Many compilers require the use of the new keyword typename before using
// the expressions queue<Item>::value_type and queue<Item>::size_type.
// Otherwise the compiler doesn't have enough information to realize that it
// is the name of a data type.
//
// CONSTRUCTOR for the queue<Item> template class:
// queue( )
// Postcondition: The queue has been initialized as an empty queue.
//
// MODIFICATION MEMBER FUNCTIONS for the queue<Item> template class:
// void pop( )
// Precondition: size( ) > 0.
// Postcondition: The front item of the queue has been removed.
//
// void push(const Item& entry)
// Postcondition: A new copy of entry has been inserted at the rear of the
// queue.
//
// CONSTANT MEMBER FUNCTIONS for the queue<Item> template class:
// bool empty( ) const
// Postcondition: The return value is true if the queue is empty.
//
// Item front( ) const
//
// size_type size( ) const
// Postcondition: The return value is the total number of items in the queue.
//
// VALUE SEMANTICS for the queue<Item> template class:
// Assignments and the copy constructor may be used with queue<Item> objects.
#ifndef MAIN_SAVITCH_QUEUE2_H // Prevent duplicate definition
#define MAIN_SAVITCH_QUEUE2_H
#include <cstdlib> // Provides std::size_t
#include "node2.h" // Node template class
namespace main_savitch_8C
{
template <class Item>
class queue
{
public:
// TYPEDEFS
typedef std::size_t size_type;
typedef Item value_type;
// CONSTRUCTORS and DESTRUCTOR
queue( );
queue(const queue<Item>& source);
~queue( );
// MODIFICATION MEMBER FUNCTIONS
void pop( );
void push(const Item& entry);
void operator =(const queue<Item>& source);
// CONSTANT MEMBER FUNCTIONS
bool empty( ) const { return (count == 0); }
Item front( ) const;
size_type size( ) const { return count; }
private:
main_savitch_6B::node<Item> *front_ptr; // head_ptr
main_savitch_6B::node<Item> *rear_ptr;
size_type count; // Total number of items in the queue
};
}
#include "queue2.template" // Include the implementation
#endif
|