IERC20 diff
创建于 差异永不过期
// SPDX-License-Identifier: MIT
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
pragma solidity ^0.8.0;
/**
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
*/
interface IERC20 {
interface IERC20 {
/**
/**
Text moved from lines 70-81
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
* @dev Returns the amount of tokens in existence.
*/
*/
function totalSupply() external view returns (uint256);
function totalSupply() external view returns (uint256);
/**
/**
* @dev Returns the amount of tokens owned by `account`.
* @dev Returns the amount of tokens owned by `account`.
*/
*/
function balanceOf(address account) external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
/**
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
* @dev Moves `amount` tokens from the caller's account to `to`.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* Emits a {Transfer} event.
* Emits a {Transfer} event.
*/
*/
function transfer(address recipient, uint256 amount) external returns (bool);
function transfer(address to, uint256 amount) external returns (bool);
/**
/**
* @dev Returns the remaining number of tokens that `spender` will be
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
* zero by default.
*
*
* This value changes when {approve} or {transferFrom} are called.
* This value changes when {approve} or {transferFrom} are called.
*/
*/
function allowance(address owner, address spender) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
/**
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
*
* Emits an {Approval} event.
* Emits an {Approval} event.
*/
*/
function approve(address spender, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);
/**
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
* allowance.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* Emits a {Transfer} event.
* Emits a {Transfer} event.
*/
*/
function transferFrom(
function transferFrom(address from, address to, uint256 amount) external returns (bool);
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
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* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
}