Mastering Blockchain Programming with Solidity

ERC20 interface – IERC20.sol

The OpenZeppelin library includes the ERC20 interface file, IERC20.sol. The IERC20.sol file is an interface that defines the functions and events that are required for the ERC20 token standard. We discussed the ERC20 token standard interface in detail in Chapter 7, ERC20 Token Standard.

The OpenZeppelin interface present at Chapter09/openzeppelin-solidity/contracts/token/ERC20/IERC20.sol is defined as follows:

interface IERC20 {    function transfer(address to, uint256 value) external returns     (bool);    function approve(address spender, uint256 value) external returns     (bool);    function transferFrom(address from, address to, uint256 value) external     returns (bool);    function totalSupply() external view returns (uint256 ...