web3-starter-sol/basic_knowledge/boilerplates/5_erc20_interface.sol
2024-10-15 12:26:21 +09:00

29 lines
977 B
Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
// ERC20 tokens provide functionalities to
// - transfer tokens
// - allow others to transfer tokens on behalf of the token holder
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.0.0/contracts/token/ERC20/IERC20.sol
interface IERC20 {
function totalSupply() external view returns (uint);
function balanceOf(address account) external view returns (uint);
function transfer(address recipient, uint amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint amount) external returns (bool);
function transferFrom(
address sender,
address recipient,
uint amount
) external returns (bool);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}