NDLI: Open pattern matching for C++

Content Provider	ACM Digital Library
Author	Solodkyy, Yuriy Dos Reis, Gabriel Stroustrup, Bjarne
Abstract	Pattern matching is an abstraction mechanism that can greatly simplify source code. We present functional-style pattern matching for C++ implemented as a library, called $Mach7^{1}.$ All the patterns are user-definable, can be stored in variables, passed among functions, and allow the use of class hierarchies. As an example, we implement common patterns used in functional languages. Our approach to pattern matching is based on compile-time composition of pattern objects through concepts. This is superior (in terms of performance and expressiveness) to approaches based on run-time composition of polymorphic pattern objects. In particular, our solution allows mapping functional code based on pattern matching directly into C++ and produces code that is only a few percent slower than hand-optimized C++ code. The library uses an efficient type switch construct, further extending it to multiple scrutinees and general patterns. We compare the performance of pattern matching to that of double dispatch and open multi-methods in C++.
Starting Page	33
Ending Page	42
Page Count	10
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2637365.2517222
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	49
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	C++ Pattern matching
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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