LlamaUtils.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import {PermissionData} from "src/lib/Structs.sol";

/// @dev Shared helper methods for Llama's contracts.
library LlamaUtils {
  /// @dev Thrown when a value cannot be safely casted to a smaller type.
  error UnsafeCast(uint256 n);

  /// @dev Reverts if `n` does not fit in a `uint64`.
  function toUint64(uint256 n) internal pure returns (uint64) {
    if (n > type(uint64).max) revert UnsafeCast(n);
    return uint64(n);
  }

  /// @dev Reverts if `n` does not fit in a `uint96`.
  function toUint96(uint256 n) internal pure returns (uint96) {
    if (n > type(uint96).max) revert UnsafeCast(n);
    return uint96(n);
  }

  /// @dev Increments a `uint256` without checking for overflow.
  function uncheckedIncrement(uint256 i) internal pure returns (uint256) {
    unchecked {
      return i + 1;
    }
  }

  /// @dev Hashes a permission to return the corresponding permission ID.
  function computePermissionId(PermissionData memory permission) internal pure returns (bytes32) {
    return keccak256(abi.encode(permission));
  }
}