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##### Custom String Types

    struct my_string
    {
        using      this_type = my_string;
        using     value_type = char;
        using       iterator = value_type*;
        using const_iterator = value_type const*;

        my_string ();
        my_string (const_iterator, const_iterator =0);

        char const*    c_str () const { return storage_; }
        const_iterator begin () const { return storage_; }
        const_iterator   end () const { return storage_ + strlen(storage_); }
        this_type& operator= (char const*);

        private:

        static size_t const size_ = 12;
        char storage_[size_];
    };

    boost::cnv::strtol cnv;

    BOOST_TEST(  "12" == convert<my_string>(12, cnv).value());
    BOOST_TEST("0.95" == convert<my_string>(0.95, cnv(arg::precision = 2)).value());