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Remove deps, and modify contracts to support the change
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pragma solidity ^0.5.0; | ||
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/** | ||
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include | ||
* the optional functions; to access them see {ERC20Detailed}. | ||
*/ | ||
interface IERC20 { | ||
/** | ||
* @dev Returns the amount of tokens in existence. | ||
*/ | ||
function totalSupply() external view returns (uint256); | ||
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/** | ||
* @dev Returns the amount of tokens owned by `account`. | ||
*/ | ||
function balanceOf(address account) external view returns (uint256); | ||
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/** | ||
* @dev Moves `amount` tokens from the caller's account to `recipient`. | ||
* | ||
* Returns a boolean value indicating whether the operation succeeded. | ||
* | ||
* Emits a {Transfer} event. | ||
*/ | ||
function transfer(address recipient, uint256 amount) external returns (bool); | ||
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/** | ||
* @dev Returns the remaining number of tokens that `spender` will be | ||
* allowed to spend on behalf of `owner` through {transferFrom}. This is | ||
* zero by default. | ||
* | ||
* This value changes when {approve} or {transferFrom} are called. | ||
*/ | ||
function allowance(address owner, address spender) external view returns (uint256); | ||
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/** | ||
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens. | ||
* | ||
* Returns a boolean value indicating whether the operation succeeded. | ||
* | ||
* 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 | ||
* transaction ordering. One possible solution to mitigate this race | ||
* condition is to first reduce the spender's allowance to 0 and set the | ||
* desired value afterwards: | ||
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 | ||
* | ||
* Emits an {Approval} event. | ||
*/ | ||
function approve(address spender, uint256 amount) external returns (bool); | ||
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/** | ||
* @dev Moves `amount` tokens from `sender` to `recipient` using the | ||
* allowance mechanism. `amount` is then deducted from the caller's | ||
* allowance. | ||
* | ||
* Returns a boolean value indicating whether the operation succeeded. | ||
* | ||
* Emits a {Transfer} event. | ||
*/ | ||
function transferFrom(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); | ||
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/** | ||
* @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); | ||
} |
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pragma solidity ^0.5.0; | ||
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/** | ||
* @dev Wrappers over Solidity's arithmetic operations with added overflow | ||
* checks. | ||
* | ||
* Arithmetic operations in Solidity wrap on overflow. This can easily result | ||
* in bugs, because programmers usually assume that an overflow raises an | ||
* error, which is the standard behavior in high level programming languages. | ||
* `SafeMath` restores this intuition by reverting the transaction when an | ||
* operation overflows. | ||
* | ||
* Using this library instead of the unchecked operations eliminates an entire | ||
* class of bugs, so it's recommended to use it always. | ||
*/ | ||
library SafeMath { | ||
/** | ||
* @dev Returns the addition of two unsigned integers, reverting on | ||
* overflow. | ||
* | ||
* Counterpart to Solidity's `+` operator. | ||
* | ||
* Requirements: | ||
* - Addition cannot overflow. | ||
*/ | ||
function add(uint256 a, uint256 b) internal pure returns (uint256) { | ||
uint256 c = a + b; | ||
require(c >= a, "SafeMath: addition overflow"); | ||
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return c; | ||
} | ||
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/** | ||
* @dev Returns the subtraction of two unsigned integers, reverting on | ||
* overflow (when the result is negative). | ||
* | ||
* Counterpart to Solidity's `-` operator. | ||
* | ||
* Requirements: | ||
* - Subtraction cannot overflow. | ||
*/ | ||
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | ||
return sub(a, b, "SafeMath: subtraction overflow"); | ||
} | ||
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/** | ||
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on | ||
* overflow (when the result is negative). | ||
* | ||
* Counterpart to Solidity's `-` operator. | ||
* | ||
* Requirements: | ||
* - Subtraction cannot overflow. | ||
* | ||
* _Available since v2.4.0._ | ||
*/ | ||
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | ||
require(b <= a, errorMessage); | ||
uint256 c = a - b; | ||
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return c; | ||
} | ||
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/** | ||
* @dev Returns the multiplication of two unsigned integers, reverting on | ||
* overflow. | ||
* | ||
* Counterpart to Solidity's `*` operator. | ||
* | ||
* Requirements: | ||
* - Multiplication cannot overflow. | ||
*/ | ||
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | ||
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the | ||
// benefit is lost if 'b' is also tested. | ||
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 | ||
if (a == 0) { | ||
return 0; | ||
} | ||
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uint256 c = a * b; | ||
require(c / a == b, "SafeMath: multiplication overflow"); | ||
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return c; | ||
} | ||
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/** | ||
* @dev Returns the integer division of two unsigned integers. Reverts on | ||
* division by zero. The result is rounded towards zero. | ||
* | ||
* Counterpart to Solidity's `/` operator. Note: this function uses a | ||
* `revert` opcode (which leaves remaining gas untouched) while Solidity | ||
* uses an invalid opcode to revert (consuming all remaining gas). | ||
* | ||
* Requirements: | ||
* - The divisor cannot be zero. | ||
*/ | ||
function div(uint256 a, uint256 b) internal pure returns (uint256) { | ||
return div(a, b, "SafeMath: division by zero"); | ||
} | ||
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/** | ||
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on | ||
* division by zero. The result is rounded towards zero. | ||
* | ||
* Counterpart to Solidity's `/` operator. Note: this function uses a | ||
* `revert` opcode (which leaves remaining gas untouched) while Solidity | ||
* uses an invalid opcode to revert (consuming all remaining gas). | ||
* | ||
* Requirements: | ||
* - The divisor cannot be zero. | ||
* | ||
* _Available since v2.4.0._ | ||
*/ | ||
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | ||
// Solidity only automatically asserts when dividing by 0 | ||
require(b > 0, errorMessage); | ||
uint256 c = a / b; | ||
// assert(a == b * c + a % b); // There is no case in which this doesn't hold | ||
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return c; | ||
} | ||
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/** | ||
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | ||
* Reverts when dividing by zero. | ||
* | ||
* Counterpart to Solidity's `%` operator. This function uses a `revert` | ||
* opcode (which leaves remaining gas untouched) while Solidity uses an | ||
* invalid opcode to revert (consuming all remaining gas). | ||
* | ||
* Requirements: | ||
* - The divisor cannot be zero. | ||
*/ | ||
function mod(uint256 a, uint256 b) internal pure returns (uint256) { | ||
return mod(a, b, "SafeMath: modulo by zero"); | ||
} | ||
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/** | ||
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | ||
* Reverts with custom message when dividing by zero. | ||
* | ||
* Counterpart to Solidity's `%` operator. This function uses a `revert` | ||
* opcode (which leaves remaining gas untouched) while Solidity uses an | ||
* invalid opcode to revert (consuming all remaining gas). | ||
* | ||
* Requirements: | ||
* - The divisor cannot be zero. | ||
* | ||
* _Available since v2.4.0._ | ||
*/ | ||
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { | ||
require(b != 0, errorMessage); | ||
return a % b; | ||
} | ||
} |
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