Constraint

tinybase::constraint

Struct Constraint 

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pub struct Constraint<T: TableType + 'static>(/* private fields */);
Expand description

Represents a constraint on a typed table.

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impl<T: TableType> Constraint<T>

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pub fn unique<I: IndexType + 'static>(index: &Index<T, I>) -> Self

Creates a new unique constraint using the given index.

§Arguments
  • index - A reference to the Index instance to be used for enforcing the unique constraint.
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pub fn check(check: fn(&T) -> bool) -> Self

Creates a new constraint based on a custom check function.

§Arguments
  • check - A function that takes a reference to the value T and returns a boolean indicating if the constraint is satisfied.

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impl<T> Freeze for Constraint<T>

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impl<T> !RefUnwindSafe for Constraint<T>

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impl<T> !Send for Constraint<T>

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impl<T> !Sync for Constraint<T>

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impl<T> Unpin for Constraint<T>

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impl<T> !UnwindSafe for Constraint<T>

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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> 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> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. 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.