https://RustRocket.rs -- Cloud Monk Losang Jinpa, Ph.D., MCSE / MCT, https://Rustaceans.rs, Full Stack Cloud Native Rust DevOps Engineer - Rocket Framework Rust Microservices on Kubernetes-AWS-Azure-GCP

“class key - a keyword (one of class, struct, or union) used to declare (and perhaps define) a nonenum user-defined type. Generalized PODs ’11 (414)” (EMCppSfe 2021)