Macro thincollections::thinvec
source · macro_rules! thinvec {
(@one $x:expr) => { ... };
($elem:expr; $n:expr) => { ... };
($($x:expr),*$(,)*) => { ... };
}
Expand description
Creates a [ThinVec
] containing the arguments.
thinvec!
allows ThinVec
s to be defined with the same syntax as array expressions.
There are two forms of this macro:
- Create a [
ThinVec
] containing a given list of elements:
let v: ThinVec<i32> = thinvec![1, 2, 3];
assert_eq!(v[0], 1);
assert_eq!(v[1], 2);
assert_eq!(v[2], 3);
- Create a [
ThinVec
] from a given element and size:
let v: ThinVec<u64> = thinvec![1; 3];
assert_eq!(3, v.len());
// assert_eq!(v, ThinVec::from_buf([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, thinvec![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.