松露编译-DeclarationError

问题描述

根据消息未声明ApproveAndCallFallBack。

我是否缺少此函数名称的导入？

错误：

/ C / Users / Me / Documents / ERC PROJECTS / SharpTokenProject / contracts / SharpToken.sol：112：1：clarificationError：未声明的标识符。 ApproveAndCallFallBack（spender）.receiveApproval（msg.sender，令牌，此，数据）; ^ -------------------- ^

错误合同

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.6.9;
import './Ownable.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20Capped.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20Pausable.sol';
import '@openzeppelin/contracts/math/SafeMath.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';





// The token
contract SharpToken is ERC20,ERC20Burnable,ERC20Capped,ERC20Pausable,Ownable,SafeMath {


string public symbol;
string public  name;
uint8 public decimals;
uint public _totalSupply;
mapping(address => uint) balances;
mapping(address => mapping(address => uint)) allowed;
// ------------------------------------------------------------------------
// Constructor
// ------------------------------------------------------------------------
constructor() public {
    symbol = "SToken";
    name = "SharpCoin";
    decimals = 18;
    _totalSupply = 300000000000000000000000000;
    balances[0x5A86f0cafD4ef3ba4f0344C138afcC84bd1ED222] = _totalSupply;
    emit Transfer(address(0),0x5A86f0cafD4ef3ba4f0344C138afcC84bd1ED222,_totalSupply);
}





//------------------------------------------------------------------------
// Total supply
// ------------------------------------------------------------------------
function totalSupply() public view returns (uint) {
return _totalSupply  - balances[address(0)];
}
// ------------------------------------------------------------------------
// Get the token balance for account tokeNowner
// ------------------------------------------------------------------------
function balanceOf(address tokeNowner) public view returns (uint balance) {
return balances[tokeNowner];
}
// ------------------------------------------------------------------------
// Transfer the balance from token owner's account to to account
// - Owner's account must have sufficient balance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------
function transfer(address to,uint tokens) public returns (bool success) {
balances[msg.sender] = sub(balances[msg.sender],tokens);
balances[to] = add(balances[to],tokens);
emit Transfer(msg.sender,to,tokens);
return true;
}
// ------------------------------------------------------------------------
// Token owner can approve for spender to transferFrom(...) tokens
// from the token owner's account
//
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// recommends that there are no checks for the approval double-spend attack
// as this should be implemented in user interfaces
// ------------------------------------------------------------------------
function approve(address spender,uint tokens) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender,spender,tokens);
return true;
}
// ------------------------------------------------------------------------
// Transfer tokens from the from account to the to account
//
// The calling account must already have sufficient tokens approve(...)-d
// for spending from the from account and
// - From account must have sufficient balance to transfer
// - Spender must have sufficient allowance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------
function transferFrom(address from,address to,uint tokens) public returns (bool success) {
balances[from] = sub(balances[from],tokens);
allowed[from][msg.sender] = sub(allowed[from][msg.sender],tokens);
emit Transfer(from,tokens);
return true;
}
// ------------------------------------------------------------------------
// Returns the amount of tokens approved by the owner that can be
// transferred to the spender's account
// ------------------------------------------------------------------------
function allowance(address tokeNowner,address spender) public view returns (uint remaining) {
return allowed[tokeNowner][spender];
}
// ------------------------------------------------------------------------
// Token owner can approve for spender to transferFrom(...) tokens
// from the token owner's account. The spender contract function
// receiveApproval(...) is then executed
// ------------------------------------------------------------------------

//ApproveAndCallFallBack IS NOT DECLARED.

function approveAndCall(address spender,uint tokens,bytes memory data) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender,tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender,tokens,this,data);
return true;
}


// ------------------------------------------------------------------------
// Don't accept ETH
// ------------------------------------------------------------------------
function fallBack() public payable {
revert();
}
// ------------------------------------------------------------------------
// Owner can transfer out any accidentally sent ERC20 tokens
// ------------------------------------------------------------------------
function transferAnyERC20Token(address tokenAddress,uint tokens) public onlyOwner returns (bool success) {
return IERC20(tokenAddress).transfer(owner,tokens);
}
}

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