cached_value.h

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#ifndef CACHED_VALUE_H
#define CACHED_VALUE_H

#include "op_exception.h"

template <class T>
class cached_value
{
public:
    cached_value() : set(false) {}

    typedef T value_type;

    value_type const get() const {
        if (!set)
            throw op_fatal_error("cached value not set");
        return value;
    }

    bool cached() const { return set; }

    value_type const reset(value_type const & val) {
        value = val;
        set = true;
        return value;
    }

private:
    value_type value;
    bool set;
};


#endif /* !CACHED_VALUE_H */