boost::optional<Unit> UnitFactorySingleton::createUnitSimple(const std::string& unitString,
UnitSystem system) const
{
if (unitString.empty()) {
Unit result = createDimensionlessUnit(system);
if (OptionalTemperatureUnit T = result.optionalCast<TemperatureUnit>()) {
T->setAsRelative();
}
return result;
}
OptionalUnit candidate;
StandardStringLookupMap::const_iterator lookupPair;
StandardStringLookupMap::const_iterator standardStringMapEnd = m_standardStringLookupMap.end();
lookupPair = m_standardStringLookupMap.find(unitString);
if (lookupPair != standardStringMapEnd) {
// unitString is registered
BOOST_FOREACH(const std::string& standardString, lookupPair->second) {
// instantiate the standardString
CallbackMapMap::const_iterator callbackMap;
StandardStringCallbackMap::const_iterator callbackPair;
OptionalUnit temp;
// try base map
callbackMap = m_callbackMaps.find(UnitSystem(UnitSystem::Mixed));
BOOST_ASSERT(callbackMap != m_callbackMaps.end());
callbackPair = callbackMap->second.find(standardString);
if ((callbackPair != callbackMap->second.end()) && (callbackPair->second != NULL)) {
temp = callbackPair->second();
}
else {
// try system map
callbackMap = m_callbackMaps.find(system);
if (callbackMap != m_callbackMaps.end()) {
callbackPair = callbackMap->second.find(standardString);
if ((callbackPair != callbackMap->second.end()) && (callbackPair->second != NULL)) {
temp = callbackPair->second();
}
}
// try all other maps
if (!temp) {
BOOST_FOREACH(int sysValue, UnitSystem::getValues()) {
UnitSystem tempSystem(sysValue);
if ((tempSystem == UnitSystem::Mixed) || (tempSystem == system)) {
continue;
}
callbackMap = m_callbackMaps.find(tempSystem);
if (callbackMap != m_callbackMaps.end()) {
callbackPair = callbackMap->second.find(standardString);
if ((callbackPair != callbackMap->second.end()) && (callbackPair->second != NULL)) {
temp = callbackPair->second();
break;
}
}
}
}
}
Quantity::Quantity(double value, const UnitSystem& system)
: m_value(value), m_units(createDimensionlessUnit(system))
{}
Quantity::Quantity(const UnitSystem& system)
: m_value(0.0), m_units(createDimensionlessUnit(system))
{}
