An abstraction barrier violation occurs whenever a part of the program that
can use a higher level function instead uses a function in a lower level.
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2.2 Data Abstraction two-element lists list literals and element selection
In each layer above, the functions in the final column enforce an abstraction
barrier. These functions are called by a higher level and implemented using a
lower level of abstraction.
<span>An abstraction barrier violation occurs whenever a part of the program that
can use a higher level function instead uses a function in a lower level. For
example, a function that computes the square of a rational number is best
implemented in terms of mul_rational , which does not assume anything about
the implementation of a ration Summary
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