exchange_state.hpp

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#pragma once
 
#include <sysio/asset.hpp>
#include <sysio/multi_index.hpp>
 
namespace sysiosystem {
 
   using sysio::asset;
   using sysio::symbol;
 
   struct [[sysio::table, sysio::contract("sysio.system")]] exchange_state {
      asset    supply;
 
      struct connector {
         asset balance;
         double weight = .5;
 
         SYSLIB_SERIALIZE( connector, (balance)(weight) )
      };
 
      connector base;
      connector quote;
 
      uint64_t primary_key()const { return supply.symbol.raw(); }
 
      asset convert_to_exchange( connector& reserve, const asset& payment );
      asset convert_from_exchange( connector& reserve, const asset& tokens );
      asset convert( const asset& from, const symbol& to );
      asset direct_convert( const asset& from, const symbol& to );
 
      static int64_t get_bancor_output( int64_t inp_reserve,
                                        int64_t out_reserve,
                                        int64_t inp );
      static int64_t get_bancor_input( int64_t out_reserve,
                                       int64_t inp_reserve,
                                       int64_t out );
 
      SYSLIB_SERIALIZE( exchange_state, (supply)(base)(quote) )
   };
 
   typedef sysio::multi_index< "rammarket"_n, exchange_state > rammarket;
}