ERC-223 トークン規格

1function name() public view returns (string)
2function symbol() public view returns (string)
3function decimals() public view returns (uint8)
4function totalSupply() public view returns (uint256)
5function balanceOf(address _owner) public view returns (uint256 balance)
6function transfer(address _to, uint256 _value) public returns (bool success)
7function transfer(address _to, uint256 _value, bytes calldata _data) public returns (bool success)
 コピー

1function tokenReceived(address _from, uint _value, bytes calldata _data)
 コピー

1event Transfer(address indexed _from, address indexed _to, uint256 _value, bytes calldata _data)
 コピー

1pragma solidity ^0.8.19;
2abstract contract IERC223Recipient {
3    function tokenReceived(address _from, uint _value, bytes memory _data) public virtual;
4}
5contract VeryBasicERC223Token {
6    event Transfer(address indexed from, address indexed to, uint value, bytes data);
7    string  private _name;
8    string  private _symbol;
9    uint8   private _decimals;
10    uint256 private _totalSupply;
11    mapping(address => uint256) private balances;
12    function name() public view returns (string memory) { return _name; }
13    function symbol() public view returns (string memory) {return _symbol; }
14    function decimals() public view returns (uint8) { return _decimals; }
15    function totalSupply() public view returns (uint256) { return _totalSupply; }
16    function balanceOf(address _owner) public view returns (uint256) { return balances[_owner]; }
17    function isContract(address account) internal view returns (bool) {
18        uint256 size;
19        assembly { size := extcodesize(account) }
20        return size > 0;
21    }
22    function transfer(address _to, uint _value, bytes calldata _data) public returns (bool success){
23        balances[msg.sender] = balances[msg.sender] - _value;
24        balances[_to] = balances[_to] + _value;
25        if(isContract(_to)) {
26            IERC223Recipient(_to).tokenReceived(msg.sender, _value, _data);
27        }
28        emit Transfer(msg.sender, _to, _value, _data);
29        return true;
30    }
31    function transfer(address _to, uint _value) public returns (bool success){
32        bytes memory _empty = hex"00000000";
33        balances[msg.sender] = balances[msg.sender] - _value;
34        balances[_to] = balances[_to] + _value;
35        if(isContract(_to)) {
36            IERC223Recipient(_to).tokenReceived(msg.sender, _value, _empty);
37        }
38        emit Transfer(msg.sender, _to, _value, _empty);
39        return true;
40    }
41}
すべて表示
 コピー

1contract RecipientContract is IERC223Recipient {
2    event Deposit(address whoSentTheTokens);
3    uint256 deposits = 0;
4    address tokenA; // 受け入れたい唯一のトークン
5    function tokenReceived(address _from, uint _value, bytes memory _data) public override
6    {
7        // この関数内で理解するべき重要な点：
8        // msg.senderは、受け取っているトークンのアドレスです。
9        // msg.valueは常に0です。なぜなら、通常トークンコントラクトはEtherを保有したり送信したりしないためです。
10        // _from      はトークン転送の送信者です。
11        // _value     は預け入れられたトークンの量です。
12        require(msg.sender == tokenA);
13        deposits += _value;
14        emit Deposit(_from);
15    }
16}
すべて表示
 コピー

1contract RecipientContract is IERC223Recipient {
2    event Foo();
3    event Bar(uint256 someNumber);
4    address tokenA; // 受け入れたい唯一のトークン
5    function tokenReceived(address _from, uint _value, bytes memory _data) public override
6    {
7        require(msg.sender == tokenA);
8        address(this).call(_data); // トランザクションを処理し、その後の関数呼び出しを実行
9    }
10    function foo() public
11    {
12        emit Foo();
13    }
14    function bar(uint256 _someNumber) public
15    {
16        emit Bar(_someNumber);
17    }
18}
すべて表示
 コピー