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
|
////////////////////////////////////////////////////////////////////////////////
// The Loki Library
// Copyright (c) 2005 by Curtis Krauskopf
// Copyright (c) 2005 by Peter Kuemmel
//
// Code covered by the MIT License
// The authors make no representations about the suitability of this software
// for any purpose. It is provided "as is" without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
// Show an example of a Loki policy that uses DeletableSingleton.
//
// Expected output:
//
// LogClass::LogClass()
// LogClass singleton instantiated
// Going to manually delete LogBook.
// LogClass::~LogClass()
// LogClass::LogClass()
// LogClass reinstantiated.
// Going to terminate program now.
// LogClass::~LogClass()
//
#include <iostream>
#include <loki/Singleton.h> // for Loki::SingletonHolder
using namespace std; // okay for small programs
using namespace Loki; // okay for small programs
// A singleton LogClass object derived from the Example class.
// Its longevity is set by the user on the command line.
//
class LogClass
{
public:
LogClass()
{
print("LogClass::LogClass()");
};
~LogClass()
{
print("LogClass::~LogClass()");
}
void print(const char *s)
{
cout << s << endl;
}
};
typedef SingletonHolder<LogClass, CreateUsingNew, DeletableSingleton> LogBook;
class Example
{
public:
void method()
{
cout << "test\n";
}
};
int main()
{
// Instantiate both singletons by calling them...
LogBook::Instance().print("LogClass singleton instantiated");
LogBook::Instance().print("Going to manually delete LogBook.");
DeletableSingleton<LogClass>::GracefulDelete();
LogBook::Instance().print("LogClass reinstantiated.");
LogBook::Instance().print("Going to terminate program now.");
#if defined(__BORLANDC__) || defined(_MSC_VER)
system("PAUSE");
#endif
return 0;
}
|
