MixinBased Programming in C++
Short summary:
This paper discusses practical issues related to mixinbased programming. We adopt a. viewpoint oriented towards C++ implementations but our discussion is ...
Long summary:
MixinBased Programming in C++Page 1MixinBased Programming in C++1Abstract.Combinations of C++ features like inheritance templates and classnesting allow for the expression of powerful component patterns. In particularresearch has demonstrated that using C++ mixin classes one can express layered componentbased designs concisely with efficient implementations. In thispaper we discuss pragmatic issues related to componentbased programmingusing C++ mixins. We explain surprising interactions of C++ features and policies that sometimes complicate mixin implementations while other times enableadditional functionality without extra effort.1 IntroductionLarge software artifacts are arguably among the most complex products of humanintellect. The complexity of software has led to implementation methodologies thatdivide a problem into manageable parts and compose the parts to form the final product. Several research efforts have argued that C++ templates (a powerful parameterization mechanism) can be used to perform this division elegantly.In particular the work of VanHilst and Notkin 29]30]31] showed how one canimplement collaborationbased (or rolebased) designs using a certain templatizedclass pattern known as a mixin class (or just mixin). Compared to other techniques(e.g. a straightforward use of application frameworks 17]) the VanHilst and Notkinmethod yields less redundancy and reusable components that reflect the structure ofthe design. At the same time unnecessary dynamic binding can be eliminated resulting into more efficient implementations. Unfortunately this method resulted in verycomplex parameterizations causing its inventors to question its scalability.The mixin layers technique was invented to address these concerns. Mixin layers aremixin classes nested in a pattern such that the parameter (superclass) of the outermixin determines the parameters (superclasses) of inner mixins. In previous work4]24]25] we showed how mixin layers solve the scalability problems of ...
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