Struct font_types::Nullable

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pub struct Nullable<T>(/* private fields */);
Expand description

An offset of a given width for which NULL (zero) is a valid value.

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impl<T> Nullable<T>

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pub fn offset(&self) -> &T

Return a reference to the inner offset

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impl<T: PartialEq<u32>> Nullable<T>

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pub fn is_null(&self) -> bool

Trait Implementations§

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impl<T: Clone> Clone for Nullable<T>

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fn clone(&self) -> Nullable<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for Nullable<T>

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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<T: NullValue> Default for Nullable<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T: PartialEq<u32>> PartialEq<u32> for Nullable<T>

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fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: PartialEq> PartialEq for Nullable<T>

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fn eq(&self, other: &Nullable<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: Scalar> Scalar for Nullable<T>

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type Raw = <T as Scalar>::Raw

The raw byte representation of this type.
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fn from_raw(raw: Self::Raw) -> Self

Create an instance of this type from raw big-endian bytes
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fn to_raw(self) -> Self::Raw

Encode this type as raw big-endian bytes
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fn read(slice: &[u8]) -> Option<Self>

Attempt to read a scalar from a slice. Read more
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impl<T> Zeroable for Nullable<T>
where T: AnyBitPattern,

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fn zeroed() -> Self

Calls zeroed. Read more
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impl<T> AnyBitPattern for Nullable<T>
where T: AnyBitPattern,

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impl<T: Copy> Copy for Nullable<T>

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impl<T: Eq> Eq for Nullable<T>

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impl<T> StructuralPartialEq for Nullable<T>

Auto Trait Implementations§

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impl<T> Freeze for Nullable<T>
where T: Freeze,

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impl<T> RefUnwindSafe for Nullable<T>
where T: RefUnwindSafe,

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impl<T> Send for Nullable<T>
where T: Send,

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impl<T> Sync for Nullable<T>
where T: Sync,

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impl<T> Unpin for Nullable<T>
where T: Unpin,

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impl<T> UnwindSafe for Nullable<T>
where T: UnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CheckedBitPattern for T
where T: AnyBitPattern,

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type Bits = T

Self must have the same layout as the specified Bits except for the possible invalid bit patterns being checked during is_valid_bit_pattern.
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fn is_valid_bit_pattern(_bits: &T) -> bool

If this function returns true, then it must be valid to reinterpret bits as &Self.
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> FixedSize for T
where T: Scalar,

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const RAW_BYTE_LEN: usize = const RAW_BYTE_LEN: usize = std::mem::size_of::<T::Raw>();

The raw size of this type, in bytes. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.