I have two questions about the library extention.

The Standard's 17.3.1.2/p1

    The library can be extended by a C++ program. Each clause, as applicable,
    describes the requirements that such extensions must meet.
    Such extensions are generally one of the following:
    - Template arguments
    - Derived classes
    - Containers, iterators, and/or algorithms that meet an interface convention

1. Dose the "C++ program" means the implementation defined?

2. How to The next Standard( like a C++0x ) guarantee the backward-portability?

--
S Kim <stkim@yujinrobot.com>


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stkim@yujinrobot.com ("Kim, Seungtai") wrote in message news:<cnrphm$9cg$1@news.kreonet.re.kr>...
> I have two questions about the library extention.
>
> The Standard's 17.3.1.2/p1
>
>     The library can be extended by a C++ program. Each clause, as applicable,
>     describes the requirements that such extensions must meet.
>     Such extensions are generally one of the following:
>     - Template arguments
>     - Derived classes
>     - Containers, iterators, and/or algorithms that meet an interface convention
>
> 1. Dose the "C++ program" means the implementation defined?

No - user defined. This is a little different from the more common use
of "extension" to describe implementation-specific additions to the
language. In this case, user code can extend the behavior of a
standard-defined template by providing it with template arguments.
However, those extensions must meet the interface requirements
applicable to those argumnts. The user can extend the behavior of a
standard-defined class by deriving from it.

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