> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-add-b20-spec.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# IActivationRegistry.checkActivated

> Generated B20 reference for checkActivated(bytes32).

[Related concept](/base-chain/specs/upgrades/beryl/b20/specification/concepts/architecture-and-precompiles)

## Signature

```solidity theme={null}
function checkActivated(bytes32 feature) external view;
```

| Field               | Value                     |
| ------------------- | ------------------------- |
| Selector            | `0xde5bfd9b`              |
| Canonical signature | `checkActivated(bytes32)` |

## Description

Reverts with `FeatureNotActivated(feature)` if `feature` is not currently activated.
A pure assertion entry point so callers don't have to redefine the error.
Dev: Reverts with `FeatureNotActivated` when `feature` is not activated.
Param: feature Feature to assert is active.

## Access control

Read-only or ERC-20-standard access rules unless the NatSpec states otherwise.

## Policy interaction

No direct policy interaction.

## Example

```solidity theme={null}
IActivationRegistry(target).checkActivated(arg0);
```

## Related

* [IActivationRegistry reference](/base-chain/specs/upgrades/beryl/b20/specification/reference/interfaces/IActivationRegistry)
* [Constants & addresses](/base-chain/specs/upgrades/beryl/b20/specification/reference/constants-and-addresses)