//-----------------------------------------------------------------------------
|
// boost variant/detail/std_hash.hpp header file
|
// See http://www.boost.org for updates, documentation, and revision history.
|
//-----------------------------------------------------------------------------
|
//
|
// Copyright (c) 2018-2020 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_VARIANT_DETAIL_STD_HASH_HPP
|
#define BOOST_VARIANT_DETAIL_STD_HASH_HPP
|
|
#include <boost/config.hpp>
|
#ifdef BOOST_HAS_PRAGMA_ONCE
|
# pragma once
|
#endif
|
|
#include <boost/variant/variant_fwd.hpp>
|
#include <boost/variant/detail/hash_variant.hpp>
|
|
///////////////////////////////////////////////////////////////////////////////
|
// macro BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH
|
//
|
// Define this macro if you do not wish to have a std::hash specialization for
|
// boost::variant.
|
|
#if !defined(BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH) && !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
|
|
#include <functional> // for std::hash
|
|
namespace std {
|
template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
struct hash<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) > > {
|
std::size_t operator()(const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& val) const {
|
return ::boost::hash_value(val);
|
}
|
};
|
}
|
|
#endif // #if !defined(BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH) && !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
|
|
#endif // BOOST_VARIANT_DETAIL_STD_HASH_HPP
|
