Counting Template Instantiations in C++ with Zero Runtime Overhead

2023/09/01

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The article discusses a technique to statically count the number of times a template was instantiated in C++, without any runtime overhead and without using the standard library. The author explains that this technique can be useful for developers who want to track the usage of templates in their codebase. The article provides a step-by-step guide on how to implement this technique, using a combination of template specialization, static member variables, and constexpr functions. The author emphasizes that this technique can be particularly helpful in performance-critical applications, where minimizing runtime overhead is crucial. Additionally, the article highlights that this technique can be used in various C++ frameworks and libraries to gather statistics about template usage. Overall, this article offers valuable insights for C++ developers who are interested in optimizing their code and understanding the usage of templates in their projects.