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pragma solidity ^0.5.0; |
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|
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/** |
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* @dev Wrappers over Solidity's arithmetic operations with added overflow |
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* checks. |
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* |
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* Arithmetic operations in Solidity wrap on overflow. This can easily result |
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* in bugs, because programmers usually assume that an overflow raises an |
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* error, which is the standard behavior in high level programming languages. |
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* `SafeMath` restores this intuition by reverting the transaction when an |
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* operation overflows. |
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* |
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* Using this library instead of the unchecked operations eliminates an entire |
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* class of bugs, so it's recommended to use it always. |
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*/ |
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library SafeMath { |
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/** |
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* @dev Returns the addition of two unsigned integers, reverting on |
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* overflow. |
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* |
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* Counterpart to Solidity's `+` operator. |
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* |
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* Requirements: |
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* - Addition cannot overflow. |
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*/ |
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function add(uint256 a, uint256 b) internal pure returns (uint256) { |
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uint256 c = a + b; |
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require(c >= a, "SafeMath: addition overflow"); |
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|
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return c; |
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} |
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|
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/** |
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* @dev Returns the subtraction of two unsigned integers, reverting on |
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* overflow (when the result is negative). |
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* |
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* Counterpart to Solidity's `-` operator. |
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* |
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* Requirements: |
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* - Subtraction cannot overflow. |
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*/ |
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function sub(uint256 a, uint256 b) internal pure returns (uint256) { |
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return sub(a, b, "SafeMath: subtraction overflow"); |
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} |
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|
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/** |
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* @dev Returns the subtraction of two unsigned integers, reverting with custom message on |
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* overflow (when the result is negative). |
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* |
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* Counterpart to Solidity's `-` operator. |
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* |
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* Requirements: |
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* - Subtraction cannot overflow. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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require(b <= a, errorMessage); |
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uint256 c = a - b; |
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|
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return c; |
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} |
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|
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/** |
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* @dev Returns the multiplication of two unsigned integers, reverting on |
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* overflow. |
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* |
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* Counterpart to Solidity's `*` operator. |
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* |
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* Requirements: |
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* - Multiplication cannot overflow. |
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*/ |
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function mul(uint256 a, uint256 b) internal pure returns (uint256) { |
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// Gas optimization: this is cheaper than requiring 'a' not being zero, but the |
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// benefit is lost if 'b' is also tested. |
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// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 |
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if (a == 0) { |
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return 0; |
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} |
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|
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uint256 c = a * b; |
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require(c / a == b, "SafeMath: multiplication overflow"); |
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return c; |
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} |
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|
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/** |
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* @dev Returns the integer division of two unsigned integers. Reverts on |
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* division by zero. The result is rounded towards zero. |
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* |
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* Counterpart to Solidity's `/` operator. Note: this function uses a |
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* `revert` opcode (which leaves remaining gas untouched) while Solidity |
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* uses an invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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*/ |
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function div(uint256 a, uint256 b) internal pure returns (uint256) { |
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return div(a, b, "SafeMath: division by zero"); |
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} |
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|
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/** |
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* @dev Returns the integer division of two unsigned integers. Reverts with custom message on |
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* division by zero. The result is rounded towards zero. |
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* |
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* Counterpart to Solidity's `/` operator. Note: this function uses a |
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* `revert` opcode (which leaves remaining gas untouched) while Solidity |
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* uses an invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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// Solidity only automatically asserts when dividing by 0 |
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require(b > 0, errorMessage); |
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uint256 c = a / b; |
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// 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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} |
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|
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/** |
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* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), |
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* Reverts when dividing by zero. |
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* |
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* Counterpart to Solidity's `%` operator. This function uses a `revert` |
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* opcode (which leaves remaining gas untouched) while Solidity uses an |
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* invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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*/ |
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function mod(uint256 a, uint256 b) internal pure returns (uint256) { |
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return mod(a, b, "SafeMath: modulo by zero"); |
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} |
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|
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/** |
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* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), |
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* Reverts with custom message when dividing by zero. |
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* |
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* Counterpart to Solidity's `%` operator. This function uses a `revert` |
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* opcode (which leaves remaining gas untouched) while Solidity uses an |
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* invalid opcode to revert (consuming all remaining gas). |
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* |
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* Requirements: |
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* - The divisor cannot be zero. |
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* |
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* _Available since v2.4.0._ |
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*/ |
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function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { |
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require(b != 0, errorMessage); |
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return a % b; |
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} |
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} |
@ -0,0 +1 @@ |
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import "https://github.com/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol"; contract test11 {} |
@ -0,0 +1,15 @@ |
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const EventEmitter = require('events') |
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|
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class SetSolidityCompilerVersion extends EventEmitter { |
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command (version) { |
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this.api |
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.click(`#compileTabView #versionSelector [value="${version}"]`) |
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.pause(5000) |
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.perform(() => { |
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this.emit('complete') |
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}) |
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return this |
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} |
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} |
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module.exports = SetSolidityCompilerVersion |
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