// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v5.0.0) (utils/StorageSlot.sol) // This file was procedurally generated from scripts/generate/templates/StorageSlot.js. pragma solidity ^0.8.24; /** * @dev Library for reading and writing primitive types to specific storage slots. * * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts. * This library helps with reading and writing to such slots without the need for inline assembly. * * The functions in this library return Slot structs that contain a `value` member that can be used to read or write. * * Example usage to set ERC-1967 implementation slot: * ```solidity * contract ERC1967 { * // Define the slot. Alternatively, use the SlotDerivation library to derive the slot. * bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc; * * function _getImplementation() internal view returns (address) { * return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value; * } * * function _setImplementation(address newImplementation) internal { * require(newImplementation.code.length > 0); * StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation; * } * } * ``` * * Since version 5.1, this library also support writing and reading value types to and from transient storage. * * * Example using transient storage: * ```solidity * contract Lock { * // 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}. */ library StorageSlot { struct AddressSlot { address value; } struct BooleanSlot { bool value; } struct Bytes32Slot { bytes32 value; } struct Uint256Slot { uint256 value; } struct Int256Slot { int256 value; } struct StringSlot { string value; } struct BytesSlot { bytes value; } /** * @dev Returns an `AddressSlot` with member `value` located at `slot`. */ function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `BooleanSlot` with member `value` located at `slot`. */ function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `Bytes32Slot` with member `value` located at `slot`. */ function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `Uint256Slot` with member `value` located at `slot`. */ function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `Int256Slot` with member `value` located at `slot`. */ function getInt256Slot(bytes32 slot) internal pure returns (Int256Slot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `StringSlot` with member `value` located at `slot`. */ function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `StringSlot` representation of the string storage pointer `store`. */ function getStringSlot(string storage store) internal pure returns (StringSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := store.slot } } /** * @dev Returns an `BytesSlot` with member `value` located at `slot`. */ function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`. */ function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := store.slot } } /** * @dev UDVT that represent a slot holding a address. */ type AddressSlotType is bytes32; /** * @dev Cast an arbitrary slot to a AddressSlotType. */ function asAddress(bytes32 slot) internal pure returns (AddressSlotType) { return AddressSlotType.wrap(slot); } /** * @dev UDVT that represent a slot holding a bool. */ type BooleanSlotType is bytes32; /** * @dev Cast an arbitrary slot to a BooleanSlotType. */ function asBoolean(bytes32 slot) internal pure returns (BooleanSlotType) { return BooleanSlotType.wrap(slot); } /** * @dev UDVT that represent a slot holding a bytes32. */ type Bytes32SlotType is bytes32; /** * @dev Cast an arbitrary slot to a Bytes32SlotType. */ function asBytes32(bytes32 slot) internal pure returns (Bytes32SlotType) { return Bytes32SlotType.wrap(slot); } /** * @dev UDVT that represent a slot holding a uint256. */ type Uint256SlotType is bytes32; /** * @dev Cast an arbitrary slot to a Uint256SlotType. */ function asUint256(bytes32 slot) internal pure returns (Uint256SlotType) { return Uint256SlotType.wrap(slot); } /** * @dev UDVT that represent a slot holding a int256. */ type Int256SlotType is bytes32; /** * @dev Cast an arbitrary slot to a Int256SlotType. */ function asInt256(bytes32 slot) internal pure returns (Int256SlotType) { return Int256SlotType.wrap(slot); } /** * @dev Load the value held at location `slot` in transient storage. */ function tload(AddressSlotType slot) internal view returns (address value) { /// @solidity memory-safe-assembly assembly { value := tload(slot) } } /** * @dev Store `value` at location `slot` in transient storage. */ function tstore(AddressSlotType slot, address value) internal { /// @solidity memory-safe-assembly assembly { tstore(slot, value) } } /** * @dev Load the value held at location `slot` in transient storage. */ function tload(BooleanSlotType slot) internal view returns (bool value) { /// @solidity memory-safe-assembly assembly { value := tload(slot) } } /** * @dev Store `value` at location `slot` in transient storage. */ function tstore(BooleanSlotType slot, bool value) internal { /// @solidity memory-safe-assembly assembly { tstore(slot, value) } } /** * @dev Load the value held at location `slot` in transient storage. */ function tload(Bytes32SlotType slot) internal view returns (bytes32 value) { /// @solidity memory-safe-assembly assembly { value := tload(slot) } } /** * @dev Store `value` at location `slot` in transient storage. */ function tstore(Bytes32SlotType slot, bytes32 value) internal { /// @solidity memory-safe-assembly assembly { tstore(slot, value) } } /** * @dev Load the value held at location `slot` in transient storage. */ function tload(Uint256SlotType slot) internal view returns (uint256 value) { /// @solidity memory-safe-assembly assembly { value := tload(slot) } } /** * @dev Store `value` at location `slot` in transient storage. */ function tstore(Uint256SlotType slot, uint256 value) internal { /// @solidity memory-safe-assembly assembly { tstore(slot, value) } } /** * @dev Load the value held at location `slot` in transient storage. */ function tload(Int256SlotType slot) internal view returns (int256 value) { /// @solidity memory-safe-assembly assembly { value := tload(slot) } } /** * @dev Store `value` at location `slot` in transient storage. */ function tstore(Int256SlotType slot, int256 value) internal { /// @solidity memory-safe-assembly assembly { tstore(slot, value) } } }