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use std::cmp::min;
#[derive(Debug, Clone, Copy)]
pub enum SizeConstraint {
Free,
Full,
Fixed(usize),
AtMost(usize),
AtLeast(usize),
}
impl SizeConstraint {
pub fn available(self, available: usize) -> usize {
match self {
SizeConstraint::Free
| SizeConstraint::Full
| SizeConstraint::AtLeast(_) => available,
SizeConstraint::Fixed(value) | SizeConstraint::AtMost(value) => {
min(value, available)
}
}
}
pub fn result(self, (result, available): (usize, usize)) -> usize {
match self {
SizeConstraint::AtLeast(value) if result < value => value,
SizeConstraint::AtMost(value) if result > value => value,
SizeConstraint::Fixed(value) => value,
SizeConstraint::Full if available > result => available,
_ => result,
}
}
}