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47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//-----------------------------------------------------------------------------
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// boost variant/detail/std_hash.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) 2018-2019 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_VARIANT_DETAIL_STD_HASH_HPP
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#define BOOST_VARIANT_DETAIL_STD_HASH_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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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/detail/hash_variant.hpp>
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///////////////////////////////////////////////////////////////////////////////
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// macro BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH
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//
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// Define this macro if you do not with to have a std::hash specialization for
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// boost::variant.
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#if !defined(BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH) && !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
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#include <functional> // for std::hash
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namespace std {
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template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
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struct hash<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) > > {
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std::size_t operator()(const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& val) const {
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return ::boost::hash_value(val);
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}
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};
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}
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#endif // #if !defined(BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH) && !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
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#endif // BOOST_VARIANT_DETAIL_STD_HASH_HPP
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