public static ulong Sub(this ulong a, ulong b)
{
ContractHelper.Assert(b <= a);
ulong c = a - b;
return(c);
}
public static ulong Add(this ulong a, ulong b)
{
ulong c = a + b;
ContractHelper.Assert(c >= a);
return(c);
}
public static ulong Div(this ulong a, ulong b)
{
ContractHelper.Assert(b > 0);
ulong c = a / b;
return(c);
}
// todo: is ulong the stratis equivalent of uint256 or does that need to get ported as well?
public static ulong Mul(this ulong a, ulong b)
{
// 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)
{
return(0);
}
ulong c = a * b;
ContractHelper.Assert(c / a == b);
return(c);
}
public static ulong Mod(this ulong a, ulong b)
{
ContractHelper.Assert(b != 0);
return(a % b);
}
