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1.2.0 | Sep 10, 2023 |
1.1.2 | Aug 18, 2023 |
1.0.3 | Dec 10, 2022 |
#898 in Data structures
11KB
216 lines
scoped_stack
scoped_stack is a Rust library that provides a stack that can be scoped. Each ScopedStack
has a HashMap
of values and a child ScopedStack
. When a scope is pushed, a new ScopedStack
is created with the uppermost ScopedStack
as its parent. When a scope is popped, the uppermost ScopedStack
is removed. When a value is pushed, it is added to the uppermost ScopedStack
. When a value is popped, it is removed from the uppermost ScopedStack
with that key. When a value is looked up, the value from the uppermost ScopedStack
with that key is returned.
Example
use scoped_stack::ScopedStack;
fn main() {
let mut stack = ScopedStack::<&str, i32>::new();
stack.insert("a", 1);
stack.insert("b", 2);
stack.insert("c", 3);
assert_eq!(stack.get(&"a"), Some(&1));
assert_eq!(stack.get(&"b"), Some(&2));
assert_eq!(stack.get(&"c"), Some(&3));
stack.push_scope();
stack.insert("a", 4);
stack.insert("b", 5);
assert_eq!(stack.get(&"a"), Some(&4));
assert_eq!(stack.get(&"b"), Some(&5));
assert_eq!(stack.get(&"c"), Some(&3));
stack.pop_scope();
assert_eq!(stack.get(&"a"), Some(&1));
assert_eq!(stack.get(&"b"), Some(&2));
assert_eq!(stack.get(&"c"), Some(&3));
}