int Unit::Append(int unit, int exp)
{
// Check number of units already appended
if (this->m_NUnits >= 6)
{
return 0;
}

// Check range
if (unit < SI_BASE_NONE || unit >= SI_NUM_UNIT_TYPES)
{
return 0;
}
if (exp < -7 || exp > 7)
{
return 0;
}

// Append
this->m_Unit[this->m_NUnits] = (igtlUint8)unit;
this->m_Exp[this->m_NUnits] = (igtlInt8)exp;
return 1;
}