restore_pref.cpp

void UnitConverter::RestoreUserPreferences(const wstring& userPreferences)
{
    if (userPreferences.empty())
    {
        return;
    }

    vector<wstring> outerTokens = StringToVector(userPreferences, L"|");
    if (outerTokens.size() == 3)
    {

        auto fromType = StringToUnit(outerTokens[0]);
        auto toType = StringToUnit(outerTokens[1]);
        m_currentCategory = StringToCategory(outerTokens[2]);
        
        // Only restore from the saved units if they are valid in the current available units.
        auto itr = m_categoryToUnits.find(m_currentCategory);
        if (itr != m_categoryToUnits.end())
        {
            auto curUnits = itr->second;
            if (find(curUnits.begin(), curUnits.end(), fromType) != curUnits.end())
            {
                m_fromType = fromType;
            }
            if (find(curUnits.begin(), curUnits.end(), fromType) != curUnits.end())
            {
                m_toType = toType;
            }
        }
    }
}

NIT:
if (outerTokens.size() != 3)
{
return;
}