TransientSlot

_Library for reading and writing value-types to specific transient storage slots.

Transient slots are often used to store temporary values that are removed after the current transaction. This library helps with reading and writing to such slots without the need for inline assembly.

Example reading and writing values using transient storage:

contract Lock {
    using TransientSlot for *;

    // Define the slot. Alternatively, use the SlotDerivation library to derive the slot.
    bytes32 internal constant _LOCK_SLOT = 0xf4678858b2b588224636b8522b729e7722d32fc491da849ed75b3fdf3c84f542;

    modifier locked() {
        require(!_LOCK_SLOT.asBoolean().tload());

        _LOCK_SLOT.asBoolean().tstore(true);
        _;
        _LOCK_SLOT.asBoolean().tstore(false);
    }
}

TIP: Consider using this library along with {SlotDerivation}._

AddressSlot

asAddress

function asAddress(bytes32 slot) internal pure returns (TransientSlot.AddressSlot)

Cast an arbitrary slot to a AddressSlot.

BooleanSlot

asBoolean

function asBoolean(bytes32 slot) internal pure returns (TransientSlot.BooleanSlot)

Cast an arbitrary slot to a BooleanSlot.

Bytes32Slot

asBytes32

function asBytes32(bytes32 slot) internal pure returns (TransientSlot.Bytes32Slot)

Cast an arbitrary slot to a Bytes32Slot.

Uint256Slot

asUint256

function asUint256(bytes32 slot) internal pure returns (TransientSlot.Uint256Slot)

Cast an arbitrary slot to a Uint256Slot.

Int256Slot

asInt256

function asInt256(bytes32 slot) internal pure returns (TransientSlot.Int256Slot)

Cast an arbitrary slot to a Int256Slot.