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 \( Val \)]

"ishekar" <is******@vsnl.net> wrote in message news:bf**********@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]

this works.

thanks

"Chris ( Val )" <ch******@bigpond.com.au> wrote in message
news:bf************@ID-110726.news.uni-berlin.de...

"ishekar" <is******@vsnl.net> wrote in message news:bf**********@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