escrow_snip_1.cpp

  void escrow::estransfer( account_name from,
                              account_name to,
                              account_name agent,
                              asset        quantity)
        {
                eosio_assert( from != to, "cannot transfer to self" );
                require_auth( from );
                eosio_assert( is_account( to ), "to account does not exist");
                eosio_assert( is_account( agent ), "escrow agent account does not exist");