Rust (programming language) influenced by Cyclone
Because of these ownership rules, Rust types are known as linear or affine types, meaning each value can be used exactly once. This enforces a form of software fault isolation as the owner of a value is solely responsible for its correctness and deallocation.Lifetimes are usually an implicit part of all reference types in Rust. Each lifetime encompasses a set of locations in the code for which a variable is valid. The borrow checker in the Rust compiler uses lifetimes to ensure that the values a reference points to remain valid. It also ensures that a mutable reference exists only if no immutable references exist at the same time. Rust's memory and ownership system was influenced by region-based memory management in languages such as Cyclone and ML Kit.Rust defines the relationship between the lifetimes of the objects created and used by functions, using lifetime parameters, as a signature feature.When a stack or temporary variable goes out of scope, it is dropped by running its destructor. The destructor may be programmatically defined through the drop function. This technique enforces the so-called resource acquisition is initialization (RAII) design pattern, in which resources, such as file descriptors or network sockets, are tied to the lifetime of an object: when the object is dropped, the resource is closed.The example below parses some configuration options from a string and creates a struct containing the options. The struct only contains references to the data; so, for the struct to remain valid, the data referred to by the struct must be valid as well. The function signature for parse_config specifies this relationship explicitly. In this example, the explicit lifetimes are unnecessary in newer Rust versions, due to lifetime elision, which is an algorithm that automatically assigns lifetimes to functions if they are trivial.