forest-filecoin 0.33.2

Rust Filecoin implementation.
Documentation 
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// SPDX-License-Identifier: MIT
// Implements an ERC20 token. Supports transfers, balance checks,
// and minting by the owner. Primarily used for testing events/logs.

pragma solidity ^0.8.0;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
}

contract RobertoCoin is IERC20 {
    string public name = "RobertoCoin";
    string public symbol = "ROB";
    uint8 public constant decimals = 18;

    uint256 private _totalSupply;
    address public owner;

    mapping(address => uint256) private _balances;

    event Mint(address indexed to, uint256 value);

    modifier onlyOwner() {
        require(msg.sender == owner, "Not the owner");
        _;
    }

    constructor() {
        owner = msg.sender;
        // Optionally mint here a fixed amount
        _mint(owner, 1000 * 10 ** uint256(decimals)); // initialSupply in wei units
    }

    // IERC20 functions

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    // Mint function for owner

    function mint(address to, uint256 amount) public onlyOwner returns (bool) {
        require(to != address(0), "ERC20: mint to zero address");
        _mint(to, amount);
        return true;
    }

    // Internal transfer function

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        require(sender != address(0), "ERC20: transfer from zero address");
        require(recipient != address(0), "ERC20: transfer to zero address");
        require(
            _balances[sender] >= amount,
            "ERC20: transfer amount exceeds balance"
        );

        _balances[sender] -= amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    // Internal mint function

    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to zero address");

        _totalSupply += amount;
        _balances[account] += amount;

        emit Mint(account, amount);
        emit Transfer(address(0), account, amount);
    }
}