Private Destructor - Use

[Amol]

Hi
What is the use declaring a dtor as private?
In one of the design tips on net, it is said that this prevents
possibiltiy of creating automatic variable of the class. Is this true?
Can this concept work in a Singleton?
How memory leak can be avoided since delete can not be called because
dtor is private?

Thanks in advance
Amol

 

[=?iso-8859-1?q?Erik_Wikstr=F6m?=]

Hi
What is the use declaring a dtor as private?
In one of the design tips on net, it is said that this prevents
possibiltiy of creating automatic variable of the class. Is this true?
Yes

Can this concept work in a Singleton?
Yes

How memory leak can be avoided since delete can not be called
because dtor is private?

You have to create a special function that deletes instances of the
class, this can either be a static function or a member function. If I
were to use this I would make the constructor private too.

class Test
{
int i_;
~Test() {}
Test(int i) : i_(i) {}
public:
static Test* create(int i)
{
return new Test(i);
}
static void del(Test* t)
{
delete t;
}
};

int main()
{
Test* t1 = Test::create(4);
Test::del(t1);

Test* t2 = new Test(4); // Does not work
Test t3(4); // Does not work either
}

 

[Jinsere]

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