record.md

record

Signature

function record() external;

Description

Tell the VM to start recording all storage reads and writes. To access the reads and writes, use accesses.

ℹ️ Note

Every write also counts as an additional read.

Examples

/// contract NumsContract {
///     uint256 public num1 = 100; // slot 0
///     uint256 public num2 = 200; // slot 1
/// }

vm.record();
numsContract.num2();
(bytes32[] memory reads, bytes32[] memory writes) = vm.accesses(
  address(numsContract)
);
emit log_uint(uint256(reads[0])); // 1

SEE ALSO

Forge Standard Library

Std Storage