castle

CASTLE is a lightweight, header-only CPP17-based template library built for safety-critical embedded systems where every byte of RAM, every millisecond of jitter, and every allocation counts.

The main idea is simple: make common C++ jobs easier without bringing the runtime costs that are often unwanted on small targets.

CASTLE 2.0 focuses on:

deterministic, fixed-capacity behavior where practical
no mandatory heap allocation
no mandatory RTTI
no mandatory exceptions
no virtual functions in the core data structures
no dependency on the C++ STL
C++17 and lower language levels
GCC, Clang, and ARM compiler families