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Software performance benefits from executing computations on constant data statically, at compile time. Unlike most languages, C++ allows expressing static computations by language means (template meta-programming), without relying on separate preprocessing tools. However, static code differs from dynamic code by syntax and even by programming style, as the former is functional, the latter imperative. A library designer who wants to support both a static and a dynamic version of an algorithm is therefore forced to design and maintain two implementations. A common formulation is presented that allows one to implement an algorithm generically by a single definition, while encoding static parameter properties within the argument types. By the choice of argument representation, the user determines how the algorithm is evaluated. This dec...
Since the Standard Template Library (STL), generic libraries in C++ rely on concepts to precisely specify the requirements of generic algorithms (function templates) on their parameters (template arguments). Modifying the definition of a concept even slightly, can have a potentially large impact on the (interfaces of the) entire library. In particular the non-local effects of a change, however, make its impact difficult to determine by hand. In this paper we propose a \conceptual change impact analysis (CCIA), which determines the impact of changes of the conceptual specification of a generic library. The analysis is organized in a pipe-and-filter manner, where the first stage finds any kind of impact, the second stage various specific kinds of impact. Both stages describe reachability algorithms, which operate on a conceptual depe...
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