Andrey Semashev 7fa65a4278 Made iterator operators conditionally defined depending on its category.
This makes iterators defined using iterator_facade more friendly to type inspection and fixes its use with next()/prior() since commit https://github.com/boostorg/utility/commit/651a869d4f9479dd3dfdd0293305a60b8c8d0e1c.
The arithmetic, indexing and relational operators are only defined if the iterator category or traversal permits that. Note that the implementation requires partial template specialization support now.
2014-06-30 00:05:38 +04:00
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Boost.org iterator module
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