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author | Amir Bandeali <abandeali1@gmail.com> | 2018-02-03 02:57:18 +0800 |
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committer | GitHub <noreply@github.com> | 2018-02-03 02:57:18 +0800 |
commit | 6a9d3de0f98dee20963f0f70a9b7ad08b9508100 (patch) | |
tree | 6fbea107aa30cbef31329bfcb68223dd8ab142d8 /packages/contracts/src/previous/SafeMath/SafeMath_v1.sol | |
parent | 47d74aa24ac06de33ae331f3589e9c8013c655ec (diff) | |
parent | 05aae368132a81ddb9fd6a04ac5b0ff1cbb24691 (diff) | |
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Merge pull request #329 from 0xProject/feature/contracts/versioning
Implement stop-gap smart contract versioning
Diffstat (limited to 'packages/contracts/src/previous/SafeMath/SafeMath_v1.sol')
-rw-r--r-- | packages/contracts/src/previous/SafeMath/SafeMath_v1.sol | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol b/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol new file mode 100644 index 000000000..341d611ec --- /dev/null +++ b/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol @@ -0,0 +1,73 @@ +pragma solidity ^0.4.11; + +contract SafeMath_v1 { + function safeMul(uint a, uint b) + internal + constant + returns (uint256) + { + uint c = a * b; + assert(a == 0 || c / a == b); + return c; + } + + function safeDiv(uint a, uint b) + internal + constant + returns (uint256) + { + uint c = a / b; + return c; + } + + function safeSub(uint a, uint b) + internal + constant + returns (uint256) + { + assert(b <= a); + return a - b; + } + + function safeAdd(uint a, uint b) + internal + constant + returns (uint256) + { + uint c = a + b; + assert(c >= a); + return c; + } + + function max64(uint64 a, uint64 b) + internal + constant + returns (uint64) + { + return a >= b ? a : b; + } + + function min64(uint64 a, uint64 b) + internal + constant + returns (uint64) + { + return a < b ? a : b; + } + + function max256(uint256 a, uint256 b) + internal + constant + returns (uint256) + { + return a >= b ? a : b; + } + + function min256(uint256 a, uint256 b) + internal + constant + returns (uint256) + { + return a < b ? a : b; + } +} |