fosd program cubesとは 意味・読み方・使い方

A program in Feature Oriented Software Development (FOSD) is a composition of functions (program transformations): a base program (modeled by a nullary function) is composed with increments in program functionality, called features (which are unary functions), to produce a complex program. A software product line (SPL) is a family of related programs. Suppose product line PL has F₀ as a base program, and F₁..F_n as features that could be added to F₀. Different compositions of these functions/transformations yield different programs. For this discussion, let + denote function composition. A program P in PL might have the following expression: