DAPP合约代币燃烧挖/矿系统开发源码搭建

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　　//call the receiveApproval function on the contract you wantto be notified.This crafts the function signature manually so onedoesn't have to include a contract in here just for this.

　　//receiveApproval(address _from,uint256 _value,address_tokenContract,bytes _extraData)

　　//it is assumed that when does this that thecall*should*succeed,otherwise one would use vanilla approveinstead.

　　require(_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))),msg.sender,_value,this,_extraData));

　　return true;

　　}

　　}

　　//SPDX-License-Identifier:MIT

　　pragma solidity^0.8.4;

　　constructor(address _CryptoDevtoken)ERC20("CryptoDev LPToken","CDLP"){

　　require(_CryptoDevtoken!=address(0),"Token address passed is anull address");

　　cryptoDevTokenAddress=_CryptoDevtoken;

　　}

　　}function deposit(uint _amount)public{

　　uint _pool=balance();

　　uint _before=token.balanceOf(address(this));

　　token.safeTransferFrom(msg.sender,address(this),_amount);

　　uint _after=token.balanceOf(address(this));

　　_amount=_after.sub(_before);

　　uint shares=0;

　　if(totalSupply()==0){

　　shares=_amount;

　　}else{

　　//Plouto Vault的pUSDT铸币量是基于YPool上USDT的数量

　　shares=(_amount.mul(totalSupply())).div(_pool);

　　}

　　_mint(msg.sender,shares);

　　}

　　import"openzeppelin/contracts/token/ERC20/ERC20.sol";

　　contract Exchange is ERC20{

　　address public cryptoDevTokenAddress;

　　//Exchange is inheriting ERC20,because our exchange would keeptrack of Crypto Dev LP tokens