constructor taking arguments

[ishekar]

Hi,

I have a class which has only one constructor that takes an argument.
I want the users of this class to pass the parameter in the declaration.
The problem i am facing is this cannot be used in the declaration section.
is there any work around.

thanks
ishekar.

class A
{
public:
A(string c){...};
}

//some user using this class
class B
{
public:
B();
private:
A("This is B's copy of A"); // this is not permitted
}

[Chris \( Val \)]

Re: constructor taking arguments


"ishekar" <ishekara@vsnl. net> wrote in message news:bfg2a2$2tp $1@news.mch.sbs .de...
| Hi,
|
| I have a class which has only one constructor that takes an argument.
| I want the users of this class to pass the parameter in the declaration.
| The problem i am facing is this cannot be used in the declaration section.
| is there any work around.

[snip]

Yes, use an initialiser list:

class A
{
public:
A( std::string s ) : S( s ) {};
private:
std::string S;
};

class B
{
public:
B( const std::string& S ) : AObj( S ) {}
private:
A AObj;
};

int main()
{
B BObj( "This is B's copy of A" );

return 0;
}

Note: Although I have modified B's constructor, you
need not have done it this way.

Cheers.
Chris Val

[ishekar]

Re: constructor taking arguments

this works.

thanks

"Chris ( Val )" <chrisval@bigpo nd.com.au> wrote in message
news:bfgfe7$egg 3k$1@ID-110726.news.uni-berlin.de...[color=blue]
>
> "ishekar" <ishekara@vsnl. net> wrote in message[/color]
news:bfg2a2$2tp $1@news.mch.sbs .de...[color=blue]
> | Hi,
> |
> | I have a class which has only one constructor that takes an argument.
> | I want the users of this class to pass the parameter in the declaration.
> | The problem i am facing is this cannot be used in the declaration[/color]
section.[color=blue]
> | is there any work around.
>
> [snip]
>
> Yes, use an initialiser list:
>
> class A
> {
> public:
> A( std::string s ) : S( s ) {};
> private:
> std::string S;
> };
>
> class B
> {
> public:
> B( const std::string& S ) : AObj( S ) {}
> private:
> A AObj;
> };
>
> int main()
> {
> B BObj( "This is B's copy of A" );
>
> return 0;
> }
>
> Note: Although I have modified B's constructor, you
> need not have done it this way.
>
> Cheers.
> Chris Val
>
>[/color]