9821c4dd3b
Checked the ASM output for these three options:
pub enum Operation {
/// Move cursor by n characters.
Retain(usize),
/// Delete n characters.
Delete(usize),
/// Insert text at position.
Insert(String),
}
pub struct A {
changes: Vec<Operation>,
len: usize,
}
impl A {
pub fn is_empty1(&self) -> bool {
match self.changes.as_slice() {
[] => true,
[Operation::Retain(_)] => true,
_ => false,
}
}
/// `true` when the set is empty.
pub fn is_empty2(&self) -> bool {
let len = self.changes.len();
len == 0
|| (
len == 1
&& self.changes[0] == Operation::Retain(self.len)
)
}
pub fn is_empty3(&self) -> bool {
match self.changes.as_slice() {
[] | [Operation::Retain(_)] => true,
_ => false
}
}
}
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| .. | ||
| src | ||
| .gitignore | ||
| Cargo.toml | ||