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  <h1 align="center">TokenizerFunction Concept</h1>

  <p>A TokenizerFunction is a functor whose purpose is to parse a given
  sequence until exactly 1 token has been found or the end is reached. It
  then updates the token, and informs the caller of the location in the
  sequence of the next element immediately after the last element of the
  sequence that was parsed for the current token.</p>

  <h2>Refinement of</h2>

  <p>Assignable, CopyConstructable</p>

  <h2>Notation