The original title is "Understanding #define, const, and constexpr in modern C++"

Short summary

A tutorial explaining the three ways to define constants in C++: #define (preprocessor text replacement, avoid for constants), const (runtime or compile-time immutability with type safety), and constexpr (forced compile-time evaluation). It covers constexpr functions, if constexpr for compile-time branching, and template-based lookup table generation as an optimization technique.

• •#define is preprocessor text replacement with no type safety or scoping—use only for conditional compilation
• •const provides type-safe immutability for values known at compile-time or runtime
• •constexpr forces compile-time evaluation, enabling optimized functions and lookup tables
• •if constexpr allows compile-time branching that eliminates dead code paths

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