Storage class
A storage class specifier is a C declaration keyword that specifies an object's storage duration, linkage, or related declaration properties.
Modern C, Third Edition
A storage class specifier is a C declaration specifier that controls an object's storage duration, linkage, or related storage properties.
- How it is used
- Organizes C declarations by object lifetime, linkage, visibility, optimization constraints, and thread-specific ownership.
- How deep it goes
- Explains automatic, extern, register, and thread_local behavior with rules and tables, but defers dynamic thread-specific destruction to tss_t APIs.
- Examples
- Uses shadowed local and extern variables, recursive automatic objects, a storage-property table, and thread-specific storage function signatures.
- What you can do after
- Evaluate declarations by predicting object identity, lifetime, visibility, linkage, addressability, and per-thread behavior.
Modern C
A storage class specifier is a C declaration keyword that specifies an object's storage duration, linkage, or related declaration properties.
- How it is used
- Clarifies how C declarations control visibility, linkage, storage duration, and access to existing objects.
- How deep it goes
- Explains shadowing, extern object identity, static lifetime, and initialization, while deferring broader declaration details to a classification table.
- Examples
- Uses nested x declarations, a retained pointer, and file-scope and block-scope i declarations involving extern.
- What you can do after
- Evaluate which object a declaration names and distinguish identifier visibility from object lifetime and usability.
Related concepts
- thread localincludes · Thread-local data is data whose value or instance is independently associated with each executing thread.
- static storageincludes · Static storage duration is the storage duration of an object whose lifetime extends throughout program execution.
- internal linkageconfigures · Internal linkage is the property restricting an identifier’s designated entity to a single translation unit.
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