Re: templates

hi ,

I'm written a template for my applications options. Options are like
this;

-option1 stringValue -option2 23.5 -option3 -option3 'c'

my "options" template is parameterized by a type (std::string, double
and char above), depending on how its instantiated<T = string, double
or char> it will have a T value that corresponds to option1, option2
or option3 above. This is ok so far.

I need an OptionManager to "manage" my Options and to have the data
each option holds returned. I need the "get" method of each Option
type below to be usable in a generic fashion.

However , I want my clients to be able to do somthing like this

double dValue;
OptionManager->get("-option2", d);

or

std::string str
OptionManager->get("option1" , str);

etc. etc.

For this I need to store my Options in a container and have a method
exposed. Howeve I can't see how I can achieve this.

The following code probably explains it better. I need the "get"
method to be useable to clients.. I cant store Options in an stl
container unless I use pointers. Once I have a pointer, I cannot call
the get method cos I don't have a base class which defines get for all
types.

template<typename T>
class Option :
{

public:
    Option(const std::vector<std::string> args, const std::string&
optionName) : m_option_name(optionName)
    {
        std::vector<std::string>::const_iterator iter =
std::find(args.begin(), args.end(), optionName);
        if (iter!=args.end()&& iter< (args.end() -1))
        {
            std::istringstream iss( *++iter);
            iss>> m_option_value;
            broken = !iss.good();

        }
    }

    void get(T& t)
    {
        if (broken)
        {
            throw std::runtime_error("bad config value");
        }

        t = m_option_value;
    }

    T m_option_value;
    std::string m_option_name;
    bool broken;

};

Could anybody help me out?

thanks and have a nice evening.