Compile Time Computation

Compile time computation is a programming technique where calculations, data processing, or code generation are performed during the compilation phase rather than at runtime. This approach leverages the compiler's ability to evaluate expressions, execute functions, and generate optimized code before the program runs, often using features like constexpr in C++ or compile-time metaprogramming. It enables performance improvements, reduced runtime overhead, and enhanced code safety by catching errors early.

Also known as: Compile-time evaluation, Static computation, CTCE, Compile-time metaprogramming, Constexpr computation

Why learn Compile Time Computation?

Developers should use compile time computation when optimizing performance-critical applications, such as game engines, scientific simulations, or embedded systems, where reducing runtime calculations can lead to significant speed gains. It is also valuable for generating type-safe code, implementing domain-specific languages, or ensuring invariants are checked at compile time to prevent bugs, as seen in template metaprogramming in C++ or macros in Rust.

Learning Resources

• docs: C++ Constexpr and Compile-Time Computation
• tutorial: Rust Macros and Compile-Time Code Generation
• video: Compile-Time Metaprogramming in Modern C++
• book: Template Metaprogramming and Compile-Time Techniques