"overloaded cast operator" and "operator const"

[John Goche]

Hello,

Could anyone please provide with some information on the
C++ overloaded cast operator and in which circumstances
this might be useful? I have consulted several references
but found no information on the uses of this operator.

Thanks,

JG

[Rolf Magnus]

John Goche wrote:

>
Hello,

Could anyone please provide with some information on the
C++ overloaded cast operator

It's a conversion operator. A "cast operator" doesn't exist.

and in which circumstances this might be useful?

It can be useful if you want to provide a conversion from your class into a
built-in type or another class that you can't change. In any other case,
you should prefer a conversion constructor.

[Frederick Gotham]

John Goche posted:

>
Hello,

Could anyone please provide with some information on the
C++ overloaded cast operator and in which circumstances
this might be useful? I have consulted several references
but found no information on the uses of this operator.

Thanks,

JG

Maybe something like:

class InputStream {
private:

bool success_last_write;

public:

InputStream &operator>>(int);

operator bool()
{
return success_last_write;
}
};

int main()
{
InputStream is;

int i;

if(is >i)
{
/* Do something */
}
}

--

Frederick Gotham