Abstract
In this article we present a compile-time algorithm, implemented using C++ template metaprogramming techniques, that minimizes the use of temporary storage when evaluating expressions. We present the basic building blocks of our algorithm---transformations that act locally on nodes of the expression parse tree---and demonstrate that the application of these local transformations generates a (nonunique) expression that requires a minimum number of temporary storage objects to evaluate. We discuss a C++ implementation of our algorithm using expression templates, and give results demonstrating the effectiveness of our approach.
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