Skip to main content

## ValueRange

# Struct ValueRange

Source

    pub struct ValueRange { /* private fields */ }

Expand description

Values per occurrence for an argument

## Implementations§

Source§

### impl ValueRange

Source

#### pub const EMPTY: ValueRange

Nor argument values, or a flag

Source

#### pub const SINGLE: ValueRange

A single argument value, the most common case for options

Source

#### pub fn new(range: impl Into<ValueRange>) -> ValueRange

Create a range

##### §Panics

In debug builds, if the range accepts no values. For an exclusive range (`start..end`) that means `end` must be greater than `start`, so both reversed ranges like `10..5` and empty ranges like `5..5` panic.

##### §Examples

    let range = ValueRange::new(5);
    let range = ValueRange::new(5..10);
    let range = ValueRange::new(5..=10);
    let range = ValueRange::new(5..);
    let range = ValueRange::new(..10);
    let range = ValueRange::new(..=10);

While these will panic:

ⓘ

    let range = ValueRange::new(10..5);  // Panics! (reversed)

ⓘ

    let range = ValueRange::new(5..5);  // Panics! (empty)

Source

#### pub fn min_values(&self) -> usize

Fewest number of values the argument accepts

Source

#### pub fn max_values(&self) -> usize

Most number of values the argument accepts

Source

#### pub fn takes_values(&self) -> bool

Report whether the argument takes any values (ie is a flag)

##### §Examples

    let range = ValueRange::new(5);
    assert!(range.takes_values());

    let range = ValueRange::new(0);
    assert!(!range.takes_values());

## Trait Implementations§

Source§

### impl Clone for ValueRange

Source§

#### fn clone(&self) -> ValueRange

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
Source§

### impl Copy for ValueRange

Source§

### impl Debug for ValueRange

Source§

#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
Source§

### impl Default for ValueRange

Source§

#### fn default() -> ValueRange

Returns the “default value” for a type. Read more
Source§

### impl Display for ValueRange

Source§

#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
Source§

### impl Eq for ValueRange

Source§

### impl From<Range<usize>> for ValueRange

Source§

#### fn from(range: Range<usize>) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<RangeFrom<usize>> for ValueRange

Source§

#### fn from(range: RangeFrom<usize>) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<RangeFull> for ValueRange

Source§

#### fn from(_: RangeFull) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<RangeInclusive<usize>> for ValueRange

Source§

#### fn from(range: RangeInclusive<usize>) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<RangeTo<usize>> for ValueRange

Source§

#### fn from(range: RangeTo<usize>) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<RangeToInclusive<usize>> for ValueRange

Source§

#### fn from(range: RangeToInclusive<usize>) -> ValueRange

Converts to this type from the input type.
Source§

### impl From<usize> for ValueRange

Source§

#### fn from(fixed: usize) -> ValueRange

Converts to this type from the input type.
Source§

### impl Hash for ValueRange

Source§

#### fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given `Hasher`. Read more
1.3.0 · Source§

#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
Source§

### impl PartialEq for ValueRange

Source§

#### fn eq(&self, other: &ValueRange) -> bool

Equality operator `==`. Read more
1.0.0 (const: unstable) · Source§

#### fn ne(&self, other: &Rhs) -> bool

Inequality operator `!=`. Read more
Source§

### impl RangeBounds<usize> for ValueRange

Source§

#### fn start_bound(&self) -> Bound<&usize>

Start index bound. Read more
Source§

#### fn end_bound(&self) -> Bound<&usize>

End index bound. Read more
1.35.0 (const: unstable) · Source§

#### fn contains<U>(&self, item: &U) -> bool
where T: PartialOrd<U>, U: PartialOrd<T> + ?Sized,

Returns `true` if `item` is contained in the range. Read more
Source§

#### fn is_empty(&self) -> bool
where T: PartialOrd,

🔬This is a nightly-only experimental API. (`range_bounds_is_empty`)
Returns `true` if the range contains no items. One-sided ranges (`RangeFrom`, etc) always return `false`. Read more
Source§

### impl StructuralPartialEq for ValueRange

## Auto Trait Implementations§

§

### impl Freeze for ValueRange

§

### impl RefUnwindSafe for ValueRange

§

### impl Send for ValueRange

§

### impl Sync for ValueRange

§

### impl Unpin for ValueRange

§

### impl UnsafeUnpin for ValueRange

§

### impl UnwindSafe for ValueRange

## Blanket Implementations§

Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
Source§

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

### impl<T> CloneToUninit for T
where T: Clone,

Source§

#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
Source§

### impl<T> From<T> for T

Source§

#### fn from(t: T) -> T

Returns the argument unchanged.

Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

Source§

### impl<I> IntoResettable<ValueRange> for I
where I: Into<ValueRange>,

Source§

#### fn into_resettable(self) -> Resettable<ValueRange>

Convert to the intended resettable type
Source§

### impl<T> ToOwned for T
where T: Clone,

Source§

#### type Owned = T

The resulting type after obtaining ownership.
Source§

#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

### impl<T> ToString for T
where T: Display + ?Sized,

Source§

#### fn to_string(&self) -> String

Converts the given value to a `String`. Read more
Source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.