> For the complete documentation index, see [llms.txt](https://docs.rigoblock.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rigoblock.com/solidity-api-reference/protocol/deps/extensionsmap.md).

# ExtensionsMap

## ExtensionsMap

Its deployed address will be different on different chains and change if selectors or mapped addresses change.

### eApps

```solidity
address eApps
```

Returns the address of the applications extension contract.

### eNavView

```solidity
address eNavView
```

Returns the address of the navigation view extension contract.

### eOracle

```solidity
address eOracle
```

Returns the address of the oracle extension contract

### eUpgrade

```solidity
address eUpgrade
```

Returns the address of the upgrade extension contract.

### eCrosschain

```solidity
address eCrosschain
```

Returns the address of the cross-chain handler extension contract.

### eGmxCallback

```solidity
address eGmxCallback
```

Returns the address of the GMX v2 callback extension contract.

### wrappedNative

```solidity
address wrappedNative
```

Returns the address of the wrapped native token.

*It is used for initializing it in the pool implementation immutable storage without passing it in the constructor.*

### constructor

```solidity
constructor() public
```

Assumes extensions have been correctly initialized.

*When adding a new app, modify apps type and assert correct params are passed to the constructor.*

### getExtensionBySelector

```solidity
function getExtensionBySelector(bytes4 selector) external view returns (address extension, bool shouldDelegatecall)
```

Returns the map of an extension's selector.

*Should be called by pool with delegatecall*

#### Parameters

| Name     | Type   | Description                         |
| -------- | ------ | ----------------------------------- |
| selector | bytes4 | Selector of the function signature. |

#### Return Values

| Name               | Type    | Description                                        |
| ------------------ | ------- | -------------------------------------------------- |
| extension          | address | Address of the target extensions.                  |
| shouldDelegatecall | bool    | Boolean if should maintain context of call or not. |