This smart contract implements the ERC20 token standard and the EIP-2612 permit function. It allows users to transfer tokens, approve token transfers, and perform token allowances. It also supports token minting and burning.

This contract implements ownership functionality, allowing the transfer of ownership to a new address. The owner can transfer ownership to another address, and only the owner can execute certain functions.

This smart contract is an extension of the ERC20 standard. It allows users to deposit and withdraw assets, mint and redeem shares, and perform accounting calculations. It also includes hooks for additional logic before withdrawals and after deposits.

This contract is a mock implementation of the ERC1155 standard. It provides functions to mint and burn tokens, as well as retrieve the URI for a given token ID.

This contract implements the ERC1155 standard for multi-token contracts. It allows for the transfer and management of multiple token types, including batch transfers and approvals. It also includes metadata logic for retrieving token URIs.

This smart contract is a library that provides arithmetic operations for fixed-point numbers. It includes functions for multiplication, division, exponentiation, square root, and modulo. The library ensures that the operations are performed safely and efficiently.

The WETH contract is an ERC20 token that represents wrapped Ether. It allows users to deposit Ether and receive an equivalent amount of WETH tokens. Users can also withdraw WETH tokens and receive the corresponding amount of Ether. The contract uses the SafeTransferLib for secure transfers and emits events for deposits and withdrawals.

The ReentrancyGuard contract prevents reentrancy attacks by locking the contract during execution of a function. It ensures that the function can only be called once at a time, preventing recursive calls that could exploit vulnerabilities.

This smart contract is a multi-role authority that manages user roles and permissions. It allows for the assignment of roles to users, configuration of role capabilities, and customization of authority for specific targets. It also supports public capabilities and authorization logic for function calls.

The MockAuthChild contract is a child contract that inherits from the Auth contract. It has a public boolean flag variable and a function called updateFlag that sets the flag to true. The updateFlag function requires authentication to be called.