文件 1 的 1：HonestDave.sol
pragma solidity 0.8.17;
contract HonestDave
{
uint256 public totalSupply_;
mapping(address => uint256) public balances_;
mapping(address => mapping(address => uint256)) public allowances_;
string public NAME = "It aint much but its honest work";
string public SYMBOL = "DAVE";
uint8 public DECIMAL_AMOUNT = 18;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
constructor() {
_mint(msg.sender, 69_000_000_000 ether);
}
function name() public view virtual returns (string memory)
{
return NAME;
}
function symbol() public view virtual returns (string memory)
{
return SYMBOL;
}
function decimals() public view virtual returns (uint8)
{
return DECIMAL_AMOUNT;
}
function totalSupply() public view virtual returns (uint256)
{
return totalSupply_;
}
function balanceOf(
address account
) public view virtual returns (uint256)
{
return balances_[account];
}
function transfer(
address to,
uint256 amount
) public virtual returns (bool)
{
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
function allowance(
address owner,
address spender
) public view virtual returns (uint256)
{
return allowances_[owner][spender];
}
function approve(
address spender,
uint256 amount
) public virtual returns (bool)
{
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
function transferFrom(
address from,
address to,
uint256 amount
) public virtual returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
function increaseAllowance(
address spender,
uint256 addedValue
) public virtual returns (bool)
{
address owner = _msgSender();
_approve(owner, spender, allowances_[owner][spender] + addedValue);
return true;
}
function decreaseAllowance(
address spender,
uint256 subtractedValue
) public virtual returns (bool)
{
address owner = _msgSender();
uint256 currentAllowance = allowances_[owner][spender];
require(currentAllowance >= subtractedValue, "Decreased allowance below zero.");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
function _transfer(
address from,
address to,
uint256 amount
) internal virtual
{
require(from != address(0), "Transfer from the zero address.");
require(to != address(0), "Transfer to the zero address.");
uint256 fromBalance = balances_[from];
require(fromBalance >= amount, "Transfer amount exceeds balance.");
unchecked {
balances_[from] = fromBalance - amount;
}
balances_[to] += amount;
emit Transfer(from, to, amount);
}
function _mint(
address account,
uint256 amount
) internal virtual
{
require(account != address(0), "Mint to the zero address.");
totalSupply_ += amount;
balances_[account] += amount;
emit Transfer(address(0), account, amount);
}
function _burn(
address account,
uint256 amount
) internal virtual
{
require(account != address(0), "Burn from the zero address.");
uint256 accountBalance = balances_[account];
require(accountBalance >= amount, "Burn amount exceeds balance.");
unchecked {
balances_[account] = accountBalance - amount;
}
totalSupply_ -= amount;
emit Transfer(account, address(0), amount);
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual
{
require(owner != address(0), "Approve from the zero address.");
require(spender != address(0), "Approve to the zero address.");
allowances_[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual
{
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "Insufficient allowance.");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}{
"compilationTarget": {
"HonestDave.sol": "HonestDave"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
