public static bool TryMultiply(ulong first, ulong second, out ulong result)
{
ulong t;
result = DoubleArithmetic.BigMul(first, second, out t);
return(0 == t);
}
public static bool TryMultiply(long first, long second, out long result)
{
long t;
var r = DoubleArithmetic.BigMul(first, second, out t);
result = unchecked ((long)r);
if (0 > (first ^ second))
{
if ((-1 == t && 0 > r) || (0 == t && 0 == r))
{
return(true);
}
}
else
{
if (0 == t && r <= (ulong)long.MaxValue)
{
return(true);
}
}
return(false);
}