a7e91856f3
* Update to ganache-cli v6.1.0 and truffle v4.1.0 * Update to stable version of ganache-cli * fix: update event emission warning - Fix event emission warnings for solidity 4.21 after truffle has been updated to use this version * fix pr review comments * update to truffle v4.1.5 * update package-lock * add additional emit keywords * update solidity-coverage to 0.4.15 * update to solium 1.1.6 * fix MerkleProof coverage analysis by testing through wrapper * change version pragma to ^0.4.21 * fix solium linting errors
49 lines
1.1 KiB
Solidity
49 lines
1.1 KiB
Solidity
pragma solidity ^0.4.21;
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/**
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* @title SafeMath
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* @dev Math operations with safety checks that throw on error
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*/
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library SafeMath {
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/**
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* @dev Multiplies two numbers, throws on overflow.
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*/
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function mul(uint256 a, uint256 b) internal pure returns (uint256) {
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if (a == 0) {
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return 0;
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}
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uint256 c = a * b;
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assert(c / a == b);
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return c;
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}
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/**
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* @dev Integer division of two numbers, truncating the quotient.
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*/
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function div(uint256 a, uint256 b) internal pure returns (uint256) {
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// assert(b > 0); // Solidity automatically throws when dividing by 0
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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 a / b;
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}
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/**
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* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
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*/
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function sub(uint256 a, uint256 b) internal pure returns (uint256) {
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assert(b <= a);
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return a - b;
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}
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/**
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* @dev Adds two numbers, throws on 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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assert(c >= a);
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return c;
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}
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}
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