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## `computeCreate2Address`

### Signature

```solidity
function computeCreate2Address(bytes32 salt, bytes32 initCodeHash) external pure returns (address);
function computeCreate2Address(bytes32 salt, bytes32 initCodeHash, address deployer) external pure returns (address);
```

### Description

Computes the address a contract will be deployed at when deployed with the `CREATE2` opcode, following `keccak256(0xff ++ deployer ++ salt ++ initCodeHash)[12:]`.

The two-argument overload uses the default CREATE2 deployer (the deterministic deployment proxy at `0x4e59b44847b379578588920cA78FbF26c0B4956C`), which Foundry uses for CREATE2 deployments in scripts. Pass an explicit `deployer` when the deployment is performed by a different contract, for example a factory executing the `CREATE2` opcode itself.

### Parameters

| Parameter      | Type      | Description                                                     |
|----------------|-----------|-----------------------------------------------------------------|
| `salt`         | `bytes32` | The CREATE2 salt                                                |
| `initCodeHash` | `bytes32` | `keccak256` of the init code (creation code plus ABI-encoded constructor arguments) |
| `deployer`     | `address` | The address executing the `CREATE2` opcode (defaults to the default CREATE2 deployer) |

### Returns

| Type      | Description                                 |
|-----------|---------------------------------------------|
| `address` | The address the contract will be deployed at |

### Examples

```solidity [test/ComputeCreate2Address.t.sol]
function testComputeCreate2Address() public {
    bytes32 salt = keccak256("my salt");
    bytes32 initCodeHash = keccak256(type(Counter).creationCode);

    // The test contract performs the CREATE2 deployment itself,
    // so it is the deployer.
    address expected = vm.computeCreate2Address(salt, initCodeHash, address(this));

    Counter counter = new Counter{salt: salt}();

    assertEq(address(counter), expected);
}
```

### Gotchas

:::note
When the contract has constructor arguments, the `initCodeHash` must include them: `keccak256(abi.encodePacked(type(MyContract).creationCode, abi.encode(arg1, arg2)))`.
:::

### Related Cheatcodes

* [`computeCreateAddress`](/reference/cheatcodes/compute-create-address) - Compute a CREATE deployment address
* [`deployCode`](/reference/cheatcodes/deploy-code) - Deploy an artifact, optionally with a CREATE2 salt