__attribute__

Mattt Thompson:

Using nonnull encodes expectations about values into an explicit contract, which can help catch any NULL pointer bugs lurking in any calling code. Remember: compile-time errors ≫ run-time errors.

Here’s the GCC reference for function attributes and the list of attributes supported by the Clang Static Analyzer.

C Programming Language Clang Compiler GNU Compiler Collection (GCC) Objective-C Programming

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