Method get_value

src/Settings.cpp:58–65

    typedef boost::property_tree::customize_stream<Ch, Traits, B> customizeB;

    inline boost::optional<external_type> get_value(const internal_type &v) const {
        std::basic_istringstream<Ch, Traits, Alloc> stream(v);
        external_type value;
        customizeA::extract(stream, value.first);
        customizeB::extract(stream, value.second);
        if (stream.fail() || stream.bad() || stream.get() != Traits::eof()) return { };
        return value;
    }
    inline boost::optional<internal_type> put_value(const external_type &v) const {
        std::basic_ostringstream<Ch, Traits, Alloc> stream;
        customizeA::insert(stream, v.first);