Macro region_buffer 

macro_rules! region_buffer {
    ($($element:expr),*) => { ... };
    ($element:expr; $len:expr) => { ... };
}

Creates a RegionBuffer containing the arguments. region_buffer! allows RegionBuffers to be defined with the same syntax as array expressions. There are two forms of this macro:

• Create a RegionBuffer containing a given list of elements:

let buf = region_buffer![1, 2, 3];

assert_eq!(*buf.get(0), 1);
assert_eq!(*buf.get(1), 2);
assert_eq!(*buf.get(2), 3);

• Create a RegionBuffer given element and length:

let buf = region_buffer![1; 3];

assert_eq!(*buf.region(0, 3), [1, 1, 1]);

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, region_buffer![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.