币安BSC火币HECO波场TRX通缩燃烧持币分红模式的合约代码

目前数字货币发行已经不仅仅局限于可以实现基本的转账功能，多种模式的合约代码不断更新出现。defi也正是因为数字通证的多样化发展变得活力巨大。合约代码的不断更新增强了defi的可操作性和智能化。币安bsc智能链加pancakeswap博饼，火币heco加mdex，波场trx加justswap代币发行模式是类型的，bsc和heco都是基于ERC20,波场是基于TRC20，但是实现的标准都是ERC标准，合约代码具有部分通用性。

目前的合约主要包括如下几个模式：通缩、燃烧、回流、指定地址转入、自动加池子、黑洞销毁、持币分红、权重分红、平均分红等。而这些模式的合约代码基本都具备通用性，在学习研究时可以通过修改其中的部分参数值来调整模式比例，熟悉每个参数的含义，有利用增加对区块链的学习深入能力。

从数字货币的流向来说其实大致就分如下几种：指定地址转入包括黑洞地址、交易手续费分红。举例比如6%的交易通缩，其中2%作为交易手续费加权分红到所有持币用户，1%燃烧掉转入黑洞地址，3%转入指定用户地址。其中加权分红是按照每个公钥地址的持币量的权重来分红代币。

如下提供一个完整的通缩实例代码：6%通缩（2%交易费加权分红+1%黑洞燃烧+3%基金会地址转入）：

contract Token is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;
    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcluded;
    address[] private _excluded;
    uint256 private constant MAX = ~uint256(0);
    uint256 private  _tTotal = 100000 * 10**6;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;
    uint256 private _tBurnTotal;
    uint256 public _taxFee = 2;
    uint256 private _previousTaxFee = _taxFee;
    uint256 public _burnFee = 1;
    uint256 private _previousBurnFee = _burnFee;
    uint256 public _fundFee = 3;
    uint256 private _previousFundFee = _fundFee;
    uint256 public  MAX_STOP_FEE_TOTAL = 1000 * 10**uint256(_decimals);
    constructor () public {
        _rOwned[_msgSender()] = _rTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function _transfer(address sender, address recipient, uint256 amount) private {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
         if(_tTotal <= MAX_STOP_FEE_TOTAL) {
            removeAllFee();
            _transferStandard(sender, recipient, amount);
        } else {
        if(_isExcludedFromFee[sender])
            removeAllFee();
         _transferStandard(sender, recipient, amount);
         if(_isExcludedFromFee[sender])
            restoreAllFee();
        }  
    }
   function _transferStandard(address sender, address recipient, uint256 tAmount) private {
        uint256 currentRate = _getRate();
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tBurn, uint256 tFund) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount); 
        _rOwned[fundAddress] = _rOwned[fundAddress].add(tFund.mul(currentRate));
        _reflectFee(rFee, tBurn.mul(currentRate), tFee, tBurn);
        emit Transfer(sender, recipient, tTransferAmount);
        emit Transfer(sender, _burnPool, tBurn);
        emit Transfer(sender, fundAddress, tFund);
 }

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