function read_bytes32(StdStorage storage self) internal returns (bytes32);function read_bool(StdStorage storage self) internal returns (bool);function read_address(StdStorage storage self) internal returns (address);function read_uint(StdStorage storage self) internal returns (uint256);function read_int(StdStorage storage self) internal returns (int256);Reads the value from the storage slot as bytes32, bool, address, uint256, or int256.
Reverts with a message if unsuccessful.