Re: How to build a string on the fly, using std::ostringstream? [Reposting]

Vidar Hasfjord <vattilah-groups@[EMAIL PROTECTED]
> wrote:
> [...]
>   const struct StringBuilderFactory
>   {
>     struct StringBuilder
>     {
>       std::auto_ptr <std::ostringstream> s;
>
>       StringBuilder ()
>         : s (new std::ostringstream ())
>       {}
>
>       template <typename T>
>       inline StringBuilder& operator << (const T& v)
>       {
>         *s << v;
>         return *this;
>       }
>
>       inline operator std::string () const
>       {return s->str ();}
>     };
>
>     template <typename T>
>     StringBuilder operator << (const T& obj) const
>     {return StringBuilder () << obj;}
>   }
>   S;
> [...]

   Doesn't 'StringBuilderFactory::operator<<()' invoke
   'operator<<()' on a tem****ary object and doesn't in
   turn 'StringBuilder::operator<<()' change the object
   it is invoked for? And isn't that forbidden? Or am I
   missing something here?

> Vidar Hasfjord

   Schobi

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