The Amazing Compile-Time Metaprogramming State Machine

Complex object construction is a classic challenge in software engineering. When an aggregate (a struct or class ) has many fields, constructors become cumbersome (telescoping constructors), and direct initialization leaves the door open to uninitialized data. The traditional answer is the Builder Pattern . In languages like Java or C#, builders are typically run-time beasts. They validate at run time that you’ve set mandatory fields, which means an application might crash because of a simple developer over