Deriving a class from string

[Paulo da Silva]

Hi.

I need a class with several string methods. I don't want to use the
string class itself because in future I may want to redefine it to use
other ways to implement the same (needed) methods but with a different
behaviour.

I tried

class myClass: public string
{ public:
using string::string;
}

This seems not to be recognized by g++.

What is the minimum code to have all string methods available in
myClass? Do I have to redefine all constructors I need to use?

Thanks for any help.

 

[Johannes Schaub (litb)]

Hi.

I need a class with several string methods. I don't want to use the
string class itself because in future I may want to redefine it to use
other ways to implement the same (needed) methods but with a different
behaviour.

I tried

class myClass: public string
{public:
using string::string;
}

This seems not to be recognized by g++.

What is the minimum code to have all string methods available in
myClass? Do I have to redefine all constructors I need to use?

This will work in C++0x (as currently specified by the draft) with the exact
syntax you use there.

 

[Paulo da Silva]

Em 05-12-2010 14:35, Daniel T. escreveu:

I need a class with several string methods. I don't want to use the
string class itself because in future I may want to redefine it to
use other ways to implement the same (needed) methods but with a
different behaviour.

[snip]

What is the minimum code to have all string methods available in
myClass?

class myClass : public std::string {

};

Feel free to use myClass::substr(), myClass::begin(), myClass::end(), etc…
as expected.
...

I suggest you use private inheritance instead of public. Implement the
constructors you need and export the minimum number of string functions
you need with using declarations.

Thanks.
That was, let's say, the classic way. I just wanted, if possible,
something simpler since I need almost the same behaviour of a complex
class except for very few methods.