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Cactus\n\nThis library provides an immutable cactus stack (also called a spaghetti stack\nor parent pointer tree). A cactus stack is a (possibly empty) node with a\n(possibly null) pointer to a parent node. Any given node has a unique path back\nto the root node. Rather than mutably updating the stack, one creates and\nobtains access to immutable nodes (when a node becomes unreachable its memory is\nautomatically reclaimed). A new child node pointing to a parent can be created\nvia the `child` function (analogous to the normal `push`) and a parent can be\nretrieved via the `parent` function (analogous to the normal `pop`).\n\n```rust\nuse cactus::Cactus;\nlet c = Cactus::new();\nassert!(c.is_empty());\nlet c2 = c.child(1);\nassert_eq!(c2.len(), 1);\nassert_eq!(*c2.val().unwrap(), 1);\nlet c3 = c2.parent().unwrap();\nassert!(c3.is_empty());\n```\n\nFrom a given node one can create multiple sub-stacks:\n\n```rust\nuse cactus::Cactus;\nlet c = Cactus::new().child(1);\nlet c2 = c.child(2);\nlet c3 = c.child(3);\nassert!(c2 != c3);\nassert_eq!(c2.vals().cloned().collect::\u003cVec\u003c_\u003e\u003e(), [2, 1]);\nassert_eq!(c3.vals().cloned().collect::\u003cVec\u003c_\u003e\u003e(), [3, 1]);\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoftdevteam%2Fcactus","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsoftdevteam%2Fcactus","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoftdevteam%2Fcactus/lists"}