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25 lines
1.3 KiB
25 lines
1.3 KiB
4 years ago
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abstract contract IERC20Good {
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function transfer(address to, uint value) external virtual returns (bool);
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function approve(address spender, uint value) external virtual returns (bool);
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function transferFrom(address from, address to, uint value) external virtual returns (bool);
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function totalSupply() external view virtual returns (uint);
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function balanceOf(address who) external view virtual returns (uint);
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function allowance(address owner, address spender) external view virtual returns (uint);
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event Transfer(address indexed from, address indexed to, uint value);
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event Approval(address indexed owner, address indexed spender, uint value);
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}
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abstract contract IERC20Bad {
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function transfer(address to, uint value) external virtual returns (bool);
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function approve(address spender, uint value) external virtual returns (bool);
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function transferFrom(address from, address to, uint value) external virtual returns (bool);
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function totalSupply() external view virtual returns (uint);
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function balanceOf(address who) external view virtual returns (uint);
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function allowance(address owner, address spender) external view virtual returns (uint);
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event Transfer(address from, address to, uint value);
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event Approval(address owner, address spender, uint value);
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}
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abstract contract ERC20BadDerived is IERC20Bad {
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}
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