77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
/*
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* Copyright (c) 2015 Cryptonomex, Inc., and contributors.
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*
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* The MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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#include <graphene/chain/protocol/authority.hpp>
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namespace graphene { namespace chain {
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/**
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* Keep track of vote totals in internal authority object. See #533.
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*/
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struct vote_counter
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{
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template< typename Component >
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void add( Component who, uint64_t votes )
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{
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if( votes == 0 )
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return;
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assert( votes <= last_votes );
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last_votes = votes;
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if( bitshift == -1 )
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bitshift = std::max(int(boost::multiprecision::detail::find_msb( votes )) - 15, 0);
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uint64_t scaled_votes = std::max( votes >> bitshift, uint64_t(1) );
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assert( scaled_votes <= std::numeric_limits<weight_type>::max() );
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total_votes += scaled_votes;
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assert( total_votes <= std::numeric_limits<uint32_t>::max() );
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auth.add_authority( who, weight_type( scaled_votes ) );
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}
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/**
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* Write into out_auth, but only if we have at least one member.
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*/
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void finish( authority& out_auth )
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{
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if( total_votes == 0 )
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return;
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assert( total_votes <= std::numeric_limits<uint32_t>::max() );
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uint32_t weight = uint32_t( total_votes );
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weight = (weight >> 1)+1;
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auth.weight_threshold = weight;
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out_auth = auth;
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}
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bool is_empty()const
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{
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return (total_votes == 0);
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}
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uint64_t last_votes = std::numeric_limits<uint64_t>::max();
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uint64_t total_votes = 0;
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int8_t bitshift = -1;
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authority auth;
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};
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} } // graphene::chain
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