Struct RegVal

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pub struct RegVal(/* private fields */);

Expand description

Register value, which may be None

Implementations§

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impl RegVal

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pub fn partial_cmp(self, num_type: NumType, other: Self) -> Option<Ordering>

Compares two values according to given arithmetics

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pub fn partial_cmp_uint(self, other: Self) -> Option<Ordering>

Compares two values according to unsigned arithmetics

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pub fn partial_cmp_int(self, other: Self) -> Option<Ordering>

Compares two values according to unsigned arithmetics

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pub fn partial_cmp_f23(self, other: Self) -> Option<Ordering>

Compares two values according to short float arithmetics

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pub fn partial_cmp_f52(self, other: Self) -> Option<Ordering>

Compares two values according to long float arithmetics

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impl RegVal

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pub fn none() -> RegVal

Creates RegVal without assigning a value to it

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pub fn some(val: Value) -> RegVal

Creates RegVal assigning a value to it

Methods from Deref<Target = Option<Value>>§

1.0.0 · Source

pub fn is_some(&self) -> bool

Returns true if the option is a Some value.

§Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_some(), true);

let x: Option<u32> = None;
assert_eq!(x.is_some(), false);

1.0.0 · Source

pub fn is_none(&self) -> bool

Returns true if the option is a None value.

§Examples

let x: Option<u32> = Some(2);
assert_eq!(x.is_none(), false);

let x: Option<u32> = None;
assert_eq!(x.is_none(), true);

1.0.0 · Source

pub fn as_ref(&self) -> Option<&T>

Converts from &Option<T> to Option<&T>.

§Examples

Calculates the length of an Option<String> as an Option<usize> without moving the String. The map method takes the self argument by value, consuming the original, so this technique uses as_ref to first take an Option to a reference to the value inside the original.

let text: Option<String> = Some("Hello, world!".to_string());
// First, cast `Option<String>` to `Option<&String>` with `as_ref`,
// then consume *that* with `map`, leaving `text` on the stack.
let text_length: Option<usize> = text.as_ref().map(|s| s.len());
println!("still can print text: {text:?}");

1.33.0 · Source

pub fn as_pin_ref(self: Pin<&Option<T>>) -> Option<Pin<&T>>

Converts from Pin<&Option<T>> to Option<Pin<&T>>.

1.33.0 · Source

pub fn as_pin_mut(self: Pin<&mut Option<T>>) -> Option<Pin<&mut T>>

Converts from Pin<&mut Option<T>> to Option<Pin<&mut T>>.

1.75.0 · Source

pub fn as_slice(&self) -> &[T]

Returns a slice of the contained value, if any. If this is None, an empty slice is returned. This can be useful to have a single type of iterator over an Option or slice.

Note: Should you have an Option<&T> and wish to get a slice of T, you can unpack it via opt.map_or(&[], std::slice::from_ref).

§Examples

assert_eq!(
    [Some(1234).as_slice(), None.as_slice()],
    [&[1234][..], &[][..]],
);

The inverse of this function is (discounting borrowing) [_]::first:

for i in [Some(1234_u16), None] {
    assert_eq!(i.as_ref(), i.as_slice().first());
}

1.40.0 · Source

pub fn as_deref(&self) -> Option<&<T as Deref>::Target>
where T: Deref,

Converts from Option<T> (or &Option<T>) to Option<&T::Target>.

Leaves the original Option in-place, creating a new one with a reference to the original one, additionally coercing the contents via Deref.

§Examples

let x: Option<String> = Some("hey".to_owned());
assert_eq!(x.as_deref(), Some("hey"));

let x: Option<String> = None;
assert_eq!(x.as_deref(), None);

1.0.0 · Source

pub fn iter(&self) -> Iter<'_, T>

Returns an iterator over the possibly contained value.

§Examples

let x = Some(4);
assert_eq!(x.iter().next(), Some(&4));

let x: Option<u32> = None;
assert_eq!(x.iter().next(), None);

Trait Implementations§

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impl Clone for RegVal

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fn clone(&self) -> RegVal

Returns a duplicate of the value. Read more

1.0.0 · Source§

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

Performs copy-assignment from source. Read more

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impl Debug for RegVal

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

Formats the value using the given formatter. Read more

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impl Default for RegVal

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fn default() -> RegVal

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

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impl Deref for RegVal

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type Target = Option<Value>

The resulting type after dereferencing.

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fn deref(&self) -> &Self::Target

Dereferences the value.

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impl Display for RegVal

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

Formats the value using the given formatter. Read more

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