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feat: use require in SafeMath (#1187)

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* feat: use require in SafeMath

* fix: grammar with revert
This commit is contained in:
Brett Sun
2018-08-10 19:41:06 +01:00
committed by Nicolás Venturo
parent 6dab31288e
commit c9e91586e7
2 changed files with 18 additions and 18 deletions
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18
contracts/math/SafeMath.sol
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@ -3,15 +3,15 @@ pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
* @dev Math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
* @dev Multiplies two numbers, reverts on overflow.
*/
function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// 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-solidity/pull/522
if (_a == 0) {
@ -19,7 +19,7 @@ library SafeMath {
}
uint256 c = _a * _b;
assert(c / _a == _b);
require(c / _a == _b);
return c;
}
@ -28,7 +28,7 @@ library SafeMath {
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
// assert(_b > 0); // Solidity automatically throws when dividing by 0
require(_b > 0); // Solidity only automatically asserts when dividing by 0
uint256 c = _a / _b;
// assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
@ -36,21 +36,21 @@ library SafeMath {
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
* @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
assert(_b <= _a);
require(_b <= _a);
uint256 c = _a - _b;
return c;
}
/**
* @dev Adds two numbers, throws on overflow.
* @dev Adds two numbers, reverts on overflow.
*/
function add(uint256 _a, uint256 _b) internal pure returns (uint256) {
uint256 c = _a + _b;
assert(c >= _a);
require(c >= _a);
return c;
}