Chris@16: //-----------------------------------------------------------------------------
Chris@16: // boost variant/detail/hash_variant.hpp header file
Chris@16: // See http://www.boost.org for updates, documentation, and revision history.
Chris@16: //-----------------------------------------------------------------------------
Chris@16: //
Chris@16: // Copyright (c) 2011
Chris@16: // Antony Polukhin
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: 
Chris@16: #ifndef BOOST_HASH_VARIANT_FUNCTION_HPP
Chris@16: #define BOOST_HASH_VARIANT_FUNCTION_HPP
Chris@16: 
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/variant/variant_fwd.hpp>
Chris@16: #include <boost/variant/static_visitor.hpp>
Chris@16: #include <boost/variant/apply_visitor.hpp>
Chris@16: #include <boost/functional/hash_fwd.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16:     namespace detail { namespace variant {
Chris@16:         struct variant_hasher: public boost::static_visitor<std::size_t> {
Chris@16:             template <class T>
Chris@16:             std::size_t operator()(T const& val) const {
Chris@16:                 boost::hash<T> hasher;
Chris@16:                 return hasher(val);
Chris@16:             }
Chris@16:         };
Chris@16:     }}
Chris@16: 
Chris@16:     template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
Chris@16:     std::size_t hash_value(variant< BOOST_VARIANT_ENUM_PARAMS(T) > const& val) {
Chris@16:         std::size_t seed = boost::apply_visitor(detail::variant::variant_hasher(), val);
Chris@16:         hash_combine(seed, val.which());
Chris@16:         return seed;
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: #endif
Chris@16: