FOSD program cubes

Article summary

In feature-oriented software development, feature-oriented software development program cubes (FOSD program cubes) are n-dimensional arrays of functions (program transformations) that represent n-dimensional product lines. A program is a composition of features: a base program is augmented with increments in program functionality, called features, to produce a complex program. A software product line (SPL) is a family of related programs. A typical product line has F 0 as a base program, and F 1 ..F n as features that could be added to F 0 . Different compositions of features yield different programs. Let + denote the feature composition operation. A program P in SPL might have the following expression: : P = F 8 + F 4 + F 2 + F 1 + F 0 That is, P extends program F 0 with features F 1 , F 2 , F 4 , and F 8 in this order. We can recast P in terms of a projection and contraction of a 1-dimensional array. Let F i = [F 0 .. F n ] denote the array of features used by a product line. A projection of F i eliminates unneeded features, yielding a shorter array (call it) G i . A contraction of G i sums each G i in a specific order, to yield a scalar expression. The expression for P becomes: : P = \sum_{i=(0,1,2,4,8)} \mathbf{F}_i where the index values accomplish projection and summation is array contraction.…

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