ith a steep learning curve." Not so. Spirit is designed to be fully
          scalable. The library is structured in layers. This permits learning on
          an as-needed basis, after only learning the minimal core and basic concepts.
        </p>
<p>
          For development simplicity and ease in deployment, the entire library consists
          of only header files, with no libraries to link against or build. Just
          put the Spirit distribution in your include path, compile and run. Code
      