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...Open pattern matching for c yuriy solodkyy gabriel dos reis bjarne stroustrup texas a muniversity college station usa yuriys gdr bs cse tamu edu abstract summary is an abstraction mechanism that can greatly sim we present functional style built as plify source code isoc library our solution implemented called mach all the patterns are to introduction of new into while user denable be stored in variables passed among functions not making any assumptions about existing ones and allow use class hierarchies example imple type safe inappropriate applications subjects ment commonpatterns used languages compile time errors approach based on makes rst citizens language composition objects through concepts this superior non intrusive so it retroactively applied exist terms performance expressiveness approaches ing types run polymorphic partic provides unied syntax various encodings extensible ular allows mapping hierarchical datatypes directly produces only few alternative interpretation contro...