VariableDebtToken

https://github.com/Into-the-Fathom/fathom-lending-platform-smart-contracts/blob/master/contracts/protocol/tokenization/VariableDebtToken.sol

The VariableDebtToken contract is part of the Fathom lending protocol. It tracks users' borrowing positions at variable interest rates. This token is non-transferable and can only be minted or burned by the lending pool.

Storage Variables

• DEBT_TOKEN_REVISION: Version of the debt token.

• _underlyingAsset: The address of the underlying asset.

• POOL: Reference to the main Pool contract.

• _incentivesController: Incentives controller for the token.

Set Functions:

• approveDelegation: Delegates borrowing power to a user.

• delegationWithSig: Delegates borrowing power via signature.

• setIncentivesController: Sets the incentives controller.

Get Functions:

• balanceOf: Returns the debt balance of a user.

• totalSupply: Returns the total supply of the debt token.

• borrowAllowance: Returns the borrow allowance for a user.

• name: Returns the name of the token.

• symbol: Returns the symbol of the token.

• decimals: Returns the number of decimals.

• getIncentivesController: Returns the incentives controller address.

• UNDERLYING_ASSET_ADDRESS: Returns the underlying asset address.

Mint/Burn Functions:

• mint: Mints debt tokens to a user.

• burn: Burns debt tokens from a user.

Disabled ERC20 Functions

The following standard ERC20 functions are disabled as this is a non-transferable token:

• transfer

• allowance

• approve

• transferFrom

• increaseAllowance

• decreaseAllowance

These functions revert with an OPERATION_NOT_SUPPORTED error if called.

Events

• Mint: Emitted when tokens are minted.

• Burn: Emitted when tokens are burned.

• BorrowAllowanceDelegated: Emitted when borrow allowance is delegated.

• Transfer: Emitted when tokens are transferred (disabled in this contract).

• Approval: Emitted when approval is given (disabled in this contract).

• Initialized: Emitted when the contract is initialized.