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Re: Should basic_*stream::is_open() be const?


"Vladimir Merzliakov" <wanderer@rsu.ru> writes:

| > | Without this methods being const (which they should be IMHO from a
| > | logical perspective, as they do not change the internal state of the
| > | stream but simply return state information), methods that use these
| > | methods can not be const.
| > | This "can not be const" will easily cascade into upper layers, which
| > | reduces quality and safeness of the code.
| > | 
| > | What are your doubts? Is there anything I might miss?
| > 
| > What do you do with a const stream?
| 
| class Parser {
|    std:ifstream m_in;
|    public: bool isOK() const { return m_in.is_open(); }
| };
| 
| ?

You're telling me that you need a const member function because you
need a constant member function.  A parser, is kind of stream.  My
question was what do you with a const stream.  If your const parser is
not OK what do you to it?

-- Gaby


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