C++: Freestanding Standard Library
2 days ago
- #Embedded Systems
- #Freestanding Implementation
- #C++
- The article explains freestanding implementations in C++, which operate without OS support like embedded systems or kernels.
- It distinguishes between hosted (full OS support) and freestanding (limited) implementations, using __STDC_HOSTED__ macro for identification.
- Key differences include threading, main() requirement, and standard headers availability, all implementation-defined in freestanding environments.
- Freestanding guarantees a minimal library subset including headers like <cstdint> and <type_traits>, but excludes OS-dependent features like <thread> or <iostream>.
- Modern C++ (from C++20 to C++26) expands freestanding support, adding features like std::span and algorithms for better abstractions in constrained environments.
- The evolution is driven by domains like embedded systems and game development to make C++ usable without full OS support.