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845c9f8a51
Conflicts: src/ripple/app/TODO.md src/ripple/app/ledger/Ledger.h src/ripple/protocol/Protocol.h
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_UTILITY_HASH_PAIR_H_INCLUDED
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#define BEAST_UTILITY_HASH_PAIR_H_INCLUDED
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#include <functional>
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#include <utility>
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#include <boost/functional/hash.hpp>
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#include <boost/utility/base_from_member.hpp>
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namespace std {
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/** Specialization of std::hash for any std::pair type. */
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template <class First, class Second>
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struct hash <std::pair <First, Second>>
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: private boost::base_from_member <std::hash <First>, 0>
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, private boost::base_from_member <std::hash <Second>, 1>
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{
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private:
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using first_hash = boost::base_from_member <std::hash <First>, 0>;
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using second_hash = boost::base_from_member <std::hash <Second>, 1>;
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public:
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hash ()
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{
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}
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hash (std::hash <First> const& first_hash_,
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std::hash <Second> const& second_hash_)
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: first_hash (first_hash_)
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, second_hash (second_hash_)
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{
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}
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std::size_t operator() (std::pair <First, Second> const& value)
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{
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std::size_t result (first_hash::member (value.first));
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boost::hash_combine (result, second_hash::member (value.second));
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return result;
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}
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std::size_t operator() (std::pair <First, Second> const& value) const
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{
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std::size_t result (first_hash::member (value.first));
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boost::hash_combine (result, second_hash::member (value.second));
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return result;
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}
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};
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}
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#endif
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