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-rw-r--r--packages/contracts/src/previous/SafeMath/SafeMath_v1.sol73
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;
+ }
+}