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kn1g/gist:18b0dbc99137149c9234f007a0d84bfe

Created October 10, 2022 15:14
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  1. kn1g created this gist Oct 10, 2022.
    106 changes: 106 additions & 0 deletions gistfile1.txt
    View file
    Original file line number Diff line number Diff line change
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    // SPDX-License-Identifier: AGPL-3.0-only
    pragma solidity 0.8.11;
    interface IRegistry {
    function register(uint8 _decimals) external;
    }
    // https://raw.githubusercontent.com/Rari-Capital/solmate/main/src/tokens/ERC20.sol
    contract ERC20 {
    /*///////////////////////////////////////////////////////////////
    EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
    /*///////////////////////////////////////////////////////////////
    METADATA STORAGE
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    uint8 public immutable decimals;
    /*///////////////////////////////////////////////////////////////
    ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    /*///////////////////////////////////////////////////////////////
    CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(
    string memory _name,
    string memory _symbol,
    uint8 _decimals
    ) {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
    }
    /*///////////////////////////////////////////////////////////////
    ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 amount) public virtual returns (bool) {
    allowance[msg.sender][spender] = amount;
    emit Approval(msg.sender, spender, amount);
    return true;
    }
    function transfer(address to, uint256 amount) public virtual returns (bool) {
    // Cannot overflow because the sum of all user
    // balances can't exceed the max uint256 value.
    unchecked {
    balanceOf[to] += amount;
    }
    emit Transfer(msg.sender, to, amount);
    return true;
    }
    function transferFrom(
    address from,
    address to,
    uint256 amount
    ) public virtual returns (bool) {
    uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
    if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
    // Cannot overflow because the sum of all user
    // balances can't exceed the max uint256 value.
    unchecked {
    balanceOf[to] += amount;
    }
    emit Transfer(from, to, amount);
    return true;
    }
    /*///////////////////////////////////////////////////////////////
    INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 amount) internal virtual {
    totalSupply += amount;
    // Cannot overflow because the sum of all user
    // balances can't exceed the max uint256 value.
    unchecked {
    balanceOf[to] += amount;
    }
    emit Transfer(address(0), to, amount);
    }
    function _burn(address from, uint256 amount) internal virtual {
    balanceOf[from] -= amount;
    // Cannot underflow because a user's balance
    // will never be larger than the total supply.
    unchecked {
    totalSupply -= amount;
    }
    emit Transfer(from, address(0), amount);
    }
    }
    contract MyToken is ERC20{
    // Please change those as you like
    string constant MY_NAME = "NicoRichCoin";
    string constant MY_SYMBOL = "NITO";
    uint8 constant MY_DECIMALS = 18;
    uint constant INITIAL_SUPPLY = 10**7;
    // Please leave unchanged
    address constant reg_addr = 0x5B174940a5C631A9B88F2e1A8c6439Ff88eF9F05;
    constructor() ERC20(MY_NAME, MY_SYMBOL, MY_DECIMALS){
    // Number of tokens that will exist
    _mint(msg.sender, INITIAL_SUPPLY * 10 ** MY_DECIMALS);
    // Please leave this untouched
    IRegistry registry = IRegistry(reg_addr);
    registry.register(MY_DECIMALS);
    }
    }