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//-----------------------------------------------------------------------------
// boost variant/detail/hash_variant.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2011
// Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_HASH_VARIANT_FUNCTION_HPP
#define BOOST_HASH_VARIANT_FUNCTION_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/variant/variant_fwd.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/functional/hash_fwd.hpp>
namespace boost {
namespace detail { namespace variant {
struct variant_hasher: public boost::static_visitor<std::size_t> {
template <class T>
std::size_t operator()(T const& val) const {
using namespace boost;
hash<T> hasher;
return hasher(val);
}
};
}}
template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
std::size_t hash_value(variant< BOOST_VARIANT_ENUM_PARAMS(T) > const& val) {
std::size_t seed = boost::apply_visitor(detail::variant::variant_hasher(), val);
hash_combine(seed, val.which());
return seed;
}
}
#endif
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