Comment #2 on issue 537 by [email protected]: GetErrno() constness
http://code.google.com/p/protobuf/issues/detail?id=537
I can use FileInputStream or FileOutputStream as part of some object that
may need to query their state in const member function.
Functions we are talking about check current object state, not filesystem.
In comment above said, that GetErrno() returns errno for the last error
occurred. It may not alter state and should be const, like
std::basic_ios::good(). I agree that this statement may be argued, but
similar classes Gzip{In,Out}putStream have such functions (ZlibErrorMessage
and ZlibErrorCode) declared const.
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