[Inquiry] Re: Theme One Program -- Commentary -- Roll

[Jon Awbrey]

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TOP.  Commentary Note 28

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Roll.

Step 1.
          o-------------------------------o
          |   o-----o           o-----o   |
          o-->|     |--> ··· -->|     |---o
              o-----o           o-----o
                                ^                      ^
                           this |                 that |
                                @                      @

Step 2.
                                                ^ that
          o-------------------------------o   o--\----------o
          |   o-----o           o-----o   |   |   o-----o   |
          o-->|     |--> ··· -->|     |---o   o-->|   0 |---o
              o-----o           o-----o           o-----o
                                ^                 ^
                           this |             nub |
                                @                 @

Step 3.
                                                ^ that
          o--------------------------------------\----------o
          |   o-----o           o-----o           o-----o   |
          o-->|     |--> ··· -->|     |---------->|   0 |---o
              o-----o           o-----o           o-----o
                                                  ^
                                             roll |
                                                  @

function roll (this, that: idea): idea;
begin
 roll := graft (this, nub (that))
end;

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