* arbitrary order then you should commit these changes to the graph.

      * arbitrary order then you should commit these changes to the graph.

      *

      *

      * Fundamentally, for most "Paths" (classes fulfilling the

      * Fundamentally, for most "Paths" (classes fulfilling the

      * PathConcept) while the builder is active (after the first modifying

      * PathConcept) while the builder is active (after the first modifying

      * operation and until the commit()) the original Path is in a

      * operation and until the commit()) the original Path is in a

      * in the case of DirPath the original path remains unchanged until the

      * in the case of DirPath the original path remains unchanged until the

      * commit. However we don't recomend that you use this feature.

      * commit. However we don't recomend that you use this feature.

      */

      */

     class Builder {

     class Builder {

       DirPath &P;

       DirPath &P;