Contract Tables

Alcor contract tables structure for contracts communication.


struct[[eosio::table]] market {
uint64_t id;
extended_symbol base_token;
extended_symbol quote_token;
asset min_buy;
asset min_sell;
bool frozen = false;
uint8_t fee = 0;
uint64_t primary_key() const { return id; }
checksum256 get_secondary_1() const {
return make256key(
string get_market_symbol() const {
return quote_token.get_symbol().code().to_string() + "/" + base_token.get_symbol().code().to_string();
typedef eosio::multi_index<"markets"_n, market,
indexed_by<"bytokens"_n, const_mem_fun<market, checksum256, &market::get_secondary_1 >
> > markets_index;
// Helper function for market 256 id
uint128_t make128key(uint64_t a, uint64_t b) {
uint128_t aa = a;
uint128_t bb = b;
return (aa << 64) + bb;
checksum256 make256key(uint64_t a, uint64_t b, uint64_t c, uint64_t d) {
if (make128key(a, b) < make128key(c, d))
return checksum256::make_from_word_sequence < uint64_t > (a, b, c, d);
return checksum256::make_from_word_sequence < uint64_t > (c, d, a, b);


in contract it's two same structure tables: buyorder and sellorder
struct [[eosio::table]] sellorder {
uint64_t id;
name account;
asset bid;
asset ask;
uint128_t unit_price;
uint32_t timestamp;
uint64_t primary_key() const { return id; }
uint64_t get_account() const { return account.value; }
typedef eosio::multi_index< "buyorder"_n, buyorder,
indexed_by<"byprice"_n, const_mem_fun<buyorder, uint128_t, &buyorder::get_price> >,
indexed_by<"byaccount"_n, const_mem_fun<buyorder, uint64_t, &buyorder::get_account> >
> buyorders_t;

Swap liquidity pool Pairs table

struct[[eosio::table]] pairs_struct {
uint64_t id;
asset supply;
extended_asset pool1;
extended_asset pool2;
int fee;
name fee_contract;
uint64_t primary_key() const {
return id;
checksum256 secondary_key() const {
return make256key( // this function can be find in markets table example above.
pool1.contract.value, pool1.quantity.symbol.code().raw(),
pool2.contract.value, pool2.quantity.symbol.code().raw()
typedef eosio::multi_index< "pairs"_n, pairs_struct,
indexed_by<"extended"_n, const_mem_fun<pairs_struct, checksum256,
&pairs_struct::secondary_key>> > pairs_index;
Last modified 8mo ago