Constructor fail?

[xxxxyz]

Hi,

I want to create a class with a constructor which can fail (for example
if (..) fail;). When constructor fail I want the variable to point to
null. Example:

class PosInt{
int i;
public PosInt(int j)
{
if (j<0)
?fail?;
i=j;
}
}

.....

PosInt m=new PosInt(-5); //after this I want m=null

How can I do this (What to put instead ?fail?)? Is this a good practice
and style?

Thanks.

[Sean Hederman]

The ability to fail a constructor is often done by throwing an exception in
the constructor. However, this is not good because AFAIK it can result in
incorrect clean-ups of the partially created object. Instead, use the
Factory Pattern to create the class.

<xx****@abv.bg> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...

Hi,

I want to create a class with a constructor which can fail (for example
if (..) fail;). When constructor fail I want the variable to point to
null. Example:

class PosInt{
int i;
public PosInt(int j)
{
if (j<0)
?fail?;
i=j;
}
}

....

PosInt m=new PosInt(-5); //after this I want m=null

How can I do this (What to put instead ?fail?)? Is this a good practice
and style?

Thanks.