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42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_INTEROPERABLE_23022003THW_HPP
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# define BOOST_INTEROPERABLE_23022003THW_HPP
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# include <boost/iterator/detail/type_traits/disjunction.hpp>
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namespace boost {
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namespace iterators {
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//
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// Meta function that determines whether two
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// iterator types are considered interoperable.
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//
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// Two iterator types A,B are considered interoperable if either
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// A is convertible to B or vice versa.
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// This interoperability definition is in sync with the
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// standards requirements on constant/mutable container
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// iterators (23.1 [lib.container.requirements]).
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//
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// For compilers that don't support is_convertible
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// is_interoperable gives false positives. See comments
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// on operator implementation for consequences.
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//
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template <typename A, typename B>
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struct is_interoperable
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: detail::disjunction<std::is_convertible<A, B>, std::is_convertible<B, A>>
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{
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};
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} // namespace iterators
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using iterators::is_interoperable;
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} // namespace boost
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#endif // BOOST_INTEROPERABLE_23022003THW_HPP
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