48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
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//-----------------------------------------------------------------------------
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// boost variant/detail/hash_variant.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2011
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// Antony Polukhin
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//
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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_HASH_VARIANT_FUNCTION_HPP
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#define BOOST_HASH_VARIANT_FUNCTION_HPP
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/functional/hash_fwd.hpp>
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namespace boost {
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namespace detail { namespace variant {
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struct variant_hasher: public boost::static_visitor<std::size_t> {
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template <class T>
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std::size_t operator()(T const& val) const {
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boost::hash<T> hasher;
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return hasher(val);
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}
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};
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}}
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template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
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std::size_t hash_value(variant< BOOST_VARIANT_ENUM_PARAMS(T) > const& val) {
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std::size_t seed = boost::apply_visitor(detail::variant::variant_hasher(), val);
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hash_combine(seed, val.which());
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return seed;
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}
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}
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#endif
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