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pragma solidity 0.4.18;
contract SafeMath_v2 {
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;
}
}
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