Cyclone és un dialect de 
C pensat per oferir tota la funcionalitat del C a la vegada que s'incorporen els mecanismes de protecció existents a altres llenguatges com el Java. Desenvolupat per AT&T Labs.
Cyclone is a programming language based on C that is safe, meaning that it rules out programs that have buffer overflows, dangling pointers, format string attacks, and so on. High-level, type-safe languages, such as Java, Scheme, or ML also provide safety, but they don't give the same control over data representations and memory management that C does (witness the fact that the run-time systems for these languages are usually written in C.) Furthermore, porting legacy C code to these languages or interfacing with legacy C libraries is a difficult and error-prone process. The goal of Cyclone is to give programmers the same low-level control and performance of C without sacrificing safety, and to make it easy to port or interface with legacy C code.
Cyclone achieves safety while remaining compatible with C by:
- Enforcing type safety (e.g., a cast from t1 to t2 is allowed only if it is safe to view a t1 as a t2)
- Not changing data representation or calling conventions
- Providing region-based, manual memory management
- Using a combination of type information and run-time checks to prevent array-bound violations
- Wrapping the C standard library with appropriate run-time checks as necessary (e.g., has a FILE already been closed)
Cyclone also provides modern features for convenient programming:
- Tagged unions
- Parametric polymorphism
- Pattern matching
- Exceptions
- Anonymous structs equivalent by structure
- Parameterized typedefs
- An extensive library for container types and other common utilities
- A lexer generator and parser generator
- Function-level debugging with gdb and profiling with gprof.
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