Quantity& Quantity::operator+=(const Quantity& temp) {
if (this == &temp) {
m_value *= 2.0;
return *this;
}
// copy input reference so we can change its properties
Quantity rQuantity(temp);
if (isTemperature() && rQuantity.isTemperature()) {
if (!isAbsolute() && rQuantity.isAbsolute()) {
setAsAbsolute();
} else if (isAbsolute() && !rQuantity.isAbsolute()){
rQuantity.setAsAbsolute();
}
}
if (m_units != rQuantity.m_units) {
LOG_AND_THROW("Cannot add quantities with different units.");
}
if (scale() != rQuantity.scale()) {
Quantity wRQuantity(rQuantity);
wRQuantity.setScale(scale().exponent);
m_value += wRQuantity.value();
}
else {
m_value += rQuantity.value();
}
return *this;
}
Quantity& Quantity::operator+=(const Quantity& rQuantity) {
if (this == &rQuantity) {
m_value *= 2.0;
return *this;
}
if (m_units != rQuantity.m_units) {
LOG_AND_THROW("Cannot add quantities with different units.");
}
if (scale() != rQuantity.scale()) {
Quantity wRQuantity(rQuantity);
wRQuantity.setScale(scale().exponent);
m_value += wRQuantity.value();
}
else {
m_value += rQuantity.value();
}
if (isTemperature() && rQuantity.isTemperature()) {
if (!isAbsolute() && rQuantity.isAbsolute()) {
setAsAbsolute();
}
}
return *this;
}
Quantity& Quantity::operator-=(const Quantity& temp) {
if (this == &temp) {
m_value = 0.0;
return *this;
}
// copy input reference so we can change its properties
Quantity rQuantity(temp);
if (isTemperature() && rQuantity.isTemperature()) {
if (isAbsolute() && rQuantity.isAbsolute()) {
// units must be the same, check that exponent on this is 1
std::vector<std::string> bus = baseUnits();
OS_ASSERT(bus.size() == 1);
if (baseUnitExponent(bus[0]) == 1) {
setAsRelative();
rQuantity.setAsRelative();
}
} else if (!isAbsolute() && rQuantity.isAbsolute()) {
setAsAbsolute();
} else if (isAbsolute() && !rQuantity.isAbsolute()) {
rQuantity.setAsAbsolute();
}
}
if (m_units != rQuantity.m_units) {
LOG_AND_THROW("Cannot subtract quantities with different units.");
}
if (scale() != rQuantity.scale()) {
Quantity wRQuantity(rQuantity);
wRQuantity.setScale(scale().exponent);
m_value -= wRQuantity.value();
}
else {
m_value -= rQuantity.value();
}
return *this;
}
