# IAccessControl

*Developer note: External interface of AccessControl declared to support ERC165 detection.*

## Events

### RoleAdminChanged

`event RoleAdminChanged(bytes32 role, bytes32 previousAdminRole, bytes32 newAdminRole)`

\*Developer note: Emitted when \`newAdminRole\` is set as \`\`role\`\`'s admin role, replacing \`previousAdminRole\`

\`DEFAULT\_ADMIN\_ROLE\` is the starting admin for all roles, despite {RoleAdminChanged} not being emitted signaling this.

*Available since v3.1.*\*

| Name              | Type    | Description |
| ----------------- | ------- | ----------- |
| role              | bytes32 |             |
| previousAdminRole | bytes32 |             |
| newAdminRole      | bytes32 |             |

### RoleGranted

`event RoleGranted(bytes32 role, address account, address sender)`

\*Developer note: Emitted when \`account\` is granted \`role\`.

\`sender\` is the account that originated the contract call, an admin role bearer except when using {AccessControl-\_setupRole}.\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |
| sender  | address |             |

### RoleRevoked

`event RoleRevoked(bytes32 role, address account, address sender)`

\*Developer note: Emitted when \`account\` is revoked \`role\`.

\`sender\` is the account that originated the contract call:

* if using \`revokeRole\`, it is the admin role bearer
* if using \`renounceRole\`, it is the role bearer (i.e. \`account\`)\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |
| sender  | address |             |

## Functions

### hasRole

`function hasRole(bytes32 role, address account) external view returns (bool)` view external

*Developer note: Returns \`true\` if \`account\` has been granted \`role\`.*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |

### getRoleAdmin

`function getRoleAdmin(bytes32 role) external view returns (bytes32)` view external

\*Developer note: Returns the admin role that controls \`role\`. See {grantRole} and {revokeRole}.

To change a role's admin, use {AccessControl-\_setRoleAdmin}.\*

| Name | Type    | Description |
| ---- | ------- | ----------- |
| role | bytes32 |             |

**Returns:**

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \[0] | bytes32 |             |

### grantRole

`function grantRole(bytes32 role, address account) external` external

\*Developer note: Grants \`role\` to \`account\`.

If \`account\` had not been already granted \`role\`, emits a {RoleGranted} event.

Requirements:

* the caller must have \`\`role\`\`'s admin role.\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |

### revokeRole

`function revokeRole(bytes32 role, address account) external` external

\*Developer note: Revokes \`role\` from \`account\`.

If \`account\` had been granted \`role\`, emits a {RoleRevoked} event.

Requirements:

* the caller must have \`\`role\`\`'s admin role.\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |

### renounceRole

`function renounceRole(bytes32 role, address account) external` external

\*Developer note: Revokes \`role\` from the calling account.

Roles are often managed via {grantRole} and {revokeRole}: this function's purpose is to provide a mechanism for accounts to lose their privileges if they are compromised (such as when a trusted device is misplaced).

If the calling account had been granted \`role\`, emits a {RoleRevoked} event.

Requirements:

* the caller must be \`account\`.\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| role    | bytes32 |             |
| account | address |             |