1.0.0[][src]Macro std::vec

macro_rules! vec {
    ($ elem : expr ; $ n : expr) => { ... };
    ($ ($ x : expr) , *) => { ... };
    ($ ($ x : expr ,) *) => { ... };
}

Creates a Vec containing the arguments.

vec! allows Vecs to be defined with the same syntax as array expressions. There are two forms of this macro:

let v = vec![1, 2, 3];
assert_eq!(v[0], 1);
assert_eq!(v[1], 2);
assert_eq!(v[2], 3);Run
let v = vec![1; 3];
assert_eq!(v, [1, 1, 1]);Run

Note that unlike array expressions this syntax supports all elements which implement Clone and the number of elements doesn't have to be a constant.

This will use clone to duplicate an expression, so one should be careful using this with types having a nonstandard Clone implementation. For example, vec![Rc::new(1); 5] will create a vector of five references to the same boxed integer value, not five references pointing to independently boxed integers.