library MyStructStorage {

  bytes32 constant MYSTRUCT_POSITION = 

    keccak256("com.mycompany.projectx.mystruct");

​

  struct MyStruct {

    uint var1;

    bytes var2;

    mapping (address => uint) var3;

  }

​

  function myStructStorage()

    internal 

    pure 

    returns (MyStruct storage mystruct) 

  {

    bytes32 position = MYSTRUCT_POSITION;

    assembly {

      mystruct.slot := position

    }

  }

}