/// <summary>
/// Subtracts the specified time difference from this instance.
/// </summary>
/// <param name="value">A time difference to subtract.</param>
/// <returns>A time difference plus a time difference.</returns>
public NtpTimestampDifference Subtract(NtpTimestampDifference value)
{
NtpTimestampDifference diff;
try {
diff = new NtpTimestampDifference(_difference - value._difference);
}
catch (OverflowException) {
throw new OverflowException(string.Format("Cannot subtract {1} from {0}.", this, value));
}
return(diff);
}
/// <summary>
/// Adds the specified time difference to this instance.
/// </summary>
/// <param name="value">A time difference to add.</param>
/// <returns>A time difference plus a time difference.</returns>
public NtpTimestampDifference Add(NtpTimestampDifference value)
{
NtpTimestampDifference difference;
try {
difference = new NtpTimestampDifference(_difference + value._difference);
}
catch (OverflowException) {
throw new OverflowException(string.Format("Cannot add {1} to {0}.", this, value));
}
return(difference);
}
/// <summary>
/// Subtracts the specified time difference from this instance.
/// </summary>
/// <param name="value">A time difference.</param>
/// <returns>A timestamp plus a time difference.</returns>
public NtpTimestamp Subtract(NtpTimestampDifference value)
{
bool flag;
var t = _timestamp - ((ulong)value.ToInt64());
if (value.Positive)
{
flag = t > _timestamp;
}
else
{
flag = t < _timestamp;
}
if (flag)
{
throw new OverflowException(string.Format("Cannot subtract {1} from {0}.", this, value));
}
return(new NtpTimestamp(t));
}