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author | Leonid <logvinov.leon@gmail.com> | 2018-02-05 19:33:40 +0800 |
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committer | GitHub <noreply@github.com> | 2018-02-05 19:33:40 +0800 |
commit | 7b4f2b47de393b7ed6d5c264c8e80864d196180c (patch) | |
tree | 8e86af8000e0aedd7241a00c2189d8f7ca0fc2ad /packages/contracts/src/current/utils/SafeMath | |
parent | 400a97e7a8f76d894d47368425bbe1e33fa5b255 (diff) | |
parent | c7ad6ebad6ab65a4b1e4a2084e744c6ca2bc09b8 (diff) | |
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Merge branch 'development' into fix/ether_token_address
Diffstat (limited to 'packages/contracts/src/current/utils/SafeMath')
-rw-r--r-- | packages/contracts/src/current/utils/SafeMath/SafeMath.sol | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/packages/contracts/src/current/utils/SafeMath/SafeMath.sol b/packages/contracts/src/current/utils/SafeMath/SafeMath.sol new file mode 100644 index 000000000..955a9e379 --- /dev/null +++ b/packages/contracts/src/current/utils/SafeMath/SafeMath.sol @@ -0,0 +1,73 @@ +pragma solidity ^0.4.18; + +contract SafeMath { + function safeMul(uint a, uint b) + internal + pure + returns (uint256) + { + uint c = a * b; + assert(a == 0 || c / a == b); + return c; + } + + function safeDiv(uint a, uint b) + internal + pure + returns (uint256) + { + uint c = a / b; + return c; + } + + function safeSub(uint a, uint b) + internal + pure + returns (uint256) + { + assert(b <= a); + return a - b; + } + + function safeAdd(uint a, uint b) + internal + pure + returns (uint256) + { + uint c = a + b; + assert(c >= a); + return c; + } + + function max64(uint64 a, uint64 b) + internal + pure + returns (uint256) + { + return a >= b ? a : b; + } + + function min64(uint64 a, uint64 b) + internal + pure + returns (uint256) + { + return a < b ? a : b; + } + + function max256(uint256 a, uint256 b) + internal + pure + returns (uint256) + { + return a >= b ? a : b; + } + + function min256(uint256 a, uint256 b) + internal + pure + returns (uint256) + { + return a < b ? a : b; + } +} |