generic_spec.h

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#ifndef GENERIC_SPEC_H
#define GENERIC_SPEC_H

#include <stdexcept>
#include <string>
#include <sstream>

#include "string_manip.h"


template <class T>
class generic_spec
{
public:
    generic_spec();

    void set(std::string const &);

    bool is_set() const {
        return !is_all;
    }

    T const value() const {
        if (!is_all)
            return data;
        throw std::out_of_range("generic_spec holds no value");
    }

    bool match(T const & rhs) const {
        return rhs == data;
    }

    bool match(generic_spec<T> const & rhs) const {
        return is_all || rhs.is_all || rhs.data == data;
    }

private:
    T data;
    bool is_all;
};


template <class T>
generic_spec<T>::generic_spec()
    :
    data(T()),
    is_all(true)
{
}


template <class T>
void generic_spec<T>::set(std::string const & str)
{
    if (str == "all") {
        is_all = true;
        return;
    }

    is_all = false;
    data = op_lexical_cast<T>(str);
}


template <>
void generic_spec<std::string>::set(std::string const & str);

#endif /* !GENERIC_SPEC_H */