# Basic implementation

The following is an overview of an example smart contract that uses vRAM

```cpp
#pragma once

#include "../dappservices/ipfs.hpp"
#include "../dappservices/multi_index.hpp"

#define DAPPSERVICES_ACTIONS() \
  XSIGNAL_DAPPSERVICE_ACTION \
  IPFS_DAPPSERVICE_ACTIONS

/*** IPFS: (xcommit)(xcleanup)(xwarmup) ***/
#define DAPPSERVICE_ACTIONS_COMMANDS() \
  IPFS_SVC_COMMANDS() 

/*** UPDATE CONTRACT NAME ***/
#define CONTRACT_NAME() mycontract

using std::string;

CONTRACT_START()
  public:

  /*** YOUR LOGIC ***/

  private:
    struct [[eosio::table]] vramaccounts {
      asset    balance;
      uint64_t primary_key()const { return balance.symbol.code().raw(); }
    };

    /*** VRAM MULTI_INDEX TABLE ***/
    typedef dapp::multi_index<"vaccounts"_n, vramaccounts> cold_accounts_t;

    /*** FOR CLIENT SIDE QUERY SUPPORT ***/
    typedef eosio::multi_index<".vaccounts"_n, vramaccounts> cold_accounts_t_v_abi;
    TABLE shardbucket {
      std::vector<char> shard_uri;
      uint64_t shard;
      uint64_t primary_key() const { return shard; }
    };
    typedef eosio::multi_index<"vaccounts"_n, shardbucket> cold_accounts_t_abi;

/*** ADD ACTIONS ***/
CONTRACT_END((your)(actions)(here))
```


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