1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/work/deba/invalid.h Thu Apr 22 20:36:21 2004 +0000
1.3 @@ -0,0 +1,33 @@
1.4 +// -*- mode:C++ -*-
1.5 +
1.6 +#ifndef HUGO_INVALID_H
1.7 +#define HUGO_INVALID_H
1.8 +
1.9 +///\file
1.10 +///\brief Definition of INVALID.
1.11 +
1.12 +namespace hugo {
1.13 +
1.14 + /// Dummy type to make it easier to make invalid iterators.
1.15 +
1.16 + /// See \ref INVALID, how to use it.
1.17 +
1.18 + struct Invalid {};
1.19 +
1.20 + /// Invalid iterators.
1.21 +
1.22 + /// \ref Invalid is a global type that converts to each iterator
1.23 + /// in such a way that the value of the target iterator will be invalid.
1.24 +
1.25 + // It is also used to convert the \c INVALID constant to the
1.26 + // node iterator that makes is possible to write
1.27 +
1.28 + //extern Invalid INVALID;
1.29 +
1.30 + //const Invalid &INVALID = *(Invalid *)0;
1.31 + const Invalid INVALID = Invalid();
1.32 +
1.33 +};
1.34 +
1.35 +#endif
1.36 +