rusqlite

Struct Map

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pub struct Map<'stmt, F> { /* private fields */ }
Expand description

F is used to transform the streaming iterator into a fallible iterator.

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impl<F, B> FallibleIterator for Map<'_, F>
where F: FnMut(&Row<'_>) -> Result<B>,

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type Error = Error

The error type.
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type Item = B

The type being iterated over.
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fn next(&mut self) -> Result<Option<B>>

Advances the iterator and returns the next value. Read more
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fn size_hint(&self) -> (usize, Option<usize>)

Returns bounds on the remaining length of the iterator. Read more
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fn count(self) -> Result<usize, Self::Error>
where Self: Sized,

Consumes the iterator, returning the number of remaining items.
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fn last(self) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized,

Returns the last element of the iterator.
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fn nth(&mut self, n: usize) -> Result<Option<Self::Item>, Self::Error>

Returns the nth element of the iterator.
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fn step_by(self, step: usize) -> StepBy<Self>
where Self: Sized,

Returns an iterator starting at the same point, but stepping by the given amount at each iteration. Read more
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fn chain<I>(self, it: I) -> Chain<Self, I>
where I: IntoFallibleIterator<Item = Self::Item, Error = Self::Error>, Self: Sized,

Returns an iterator which yields the elements of this iterator followed by another.
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fn zip<I>( self, o: I, ) -> Zip<Self, <I as IntoFallibleIterator>::IntoFallibleIter>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>,

Returns an iterator that yields pairs of this iterator’s and another iterator’s values.
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fn map<F, B>(self, f: F) -> Map<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> Result<B, Self::Error>,

Returns an iterator which applies a fallible transform to the elements of the underlying iterator.
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fn for_each<F>(self, f: F) -> Result<(), Self::Error>
where Self: Sized, F: FnMut(Self::Item) -> Result<(), Self::Error>,

Calls a fallible closure on each element of an iterator.
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fn filter<F>(self, f: F) -> Filter<Self, F>
where Self: Sized, F: FnMut(&Self::Item) -> Result<bool, Self::Error>,

Returns an iterator which uses a predicate to determine which values should be yielded. The predicate may fail; such failures are passed to the caller.
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fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> Result<Option<B>, Self::Error>,

Returns an iterator which both filters and maps. The closure may fail; such failures are passed along to the consumer.
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fn enumerate(self) -> Enumerate<Self>
where Self: Sized,

Returns an iterator which yields the current iteration count as well as the value.
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fn peekable(self) -> Peekable<Self>
where Self: Sized,

Returns an iterator that can peek at the next element without consuming it.
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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> Result<bool, Self::Error>,

Returns an iterator that skips elements based on a predicate.
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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> Result<bool, Self::Error>,

Returns an iterator that yields elements based on a predicate.
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fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Returns an iterator which skips the first n values of this iterator.
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fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Returns an iterator that yields only the first n values of this iterator.
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fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>
where Self: Sized, F: FnMut(&mut St, Self::Item) -> Result<Option<B>, Self::Error>,

Returns an iterator which applies a stateful map to values of this iterator.
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where Self: Sized, U: IntoFallibleIterator<Error = Self::Error>, F: FnMut(Self::Item) -> Result<U, Self::Error>,

Returns an iterator which maps this iterator’s elements to iterators, yielding those iterators’ values.
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fn flatten(self) -> Flatten<Self>
where Self: Sized, Self::Item: IntoFallibleIterator<Error = Self::Error>,

Returns an iterator which flattens an iterator of iterators, yielding those iterators’ values.
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fn fuse(self) -> Fuse<Self>
where Self: Sized,

Returns an iterator which yields this iterator’s elements and ends after the first Ok(None). Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>
where Self: Sized, F: FnMut(&Self::Item) -> Result<(), Self::Error>,

Returns an iterator which passes each element to a closure before returning it.
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fn by_ref(&mut self) -> &mut Self
where Self: Sized,

Borrow an iterator rather than consuming it. Read more
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fn collect<T>(self) -> Result<T, Self::Error>
where T: FromIterator<Self::Item>, Self: Sized,

Transforms the iterator into a collection. Read more
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fn partition<B, F>(self, f: F) -> Result<(B, B), Self::Error>
where Self: Sized, B: Default + Extend<Self::Item>, F: FnMut(&Self::Item) -> Result<bool, Self::Error>,

Transforms the iterator into two collections, partitioning elements by a closure.
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fn fold<B, F>(self, init: B, f: F) -> Result<B, Self::Error>
where Self: Sized, F: FnMut(B, Self::Item) -> Result<B, Self::Error>,

Applies a function over the elements of the iterator, producing a single final value.
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fn try_fold<B, E, F>(&mut self, init: B, f: F) -> Result<B, E>
where Self: Sized, E: From<Self::Error>, F: FnMut(B, Self::Item) -> Result<B, E>,

Applies a function over the elements of the iterator, producing a single final value. Read more
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fn all<F>(&mut self, f: F) -> Result<bool, Self::Error>
where Self: Sized, F: FnMut(Self::Item) -> Result<bool, Self::Error>,

Determines if all elements of this iterator match a predicate.
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fn any<F>(&mut self, f: F) -> Result<bool, Self::Error>
where Self: Sized, F: FnMut(Self::Item) -> Result<bool, Self::Error>,

Determines if any element of this iterator matches a predicate.
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fn find<F>(&mut self, f: F) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, F: FnMut(&Self::Item) -> Result<bool, Self::Error>,

Returns the first element of the iterator that matches a predicate.
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fn find_map<B, F>(&mut self, f: F) -> Result<Option<B>, Self::Error>
where Self: Sized, F: FnMut(Self::Item) -> Result<Option<B>, Self::Error>,

Applies a function to the elements of the iterator, returning the first non-None result.
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fn position<F>(&mut self, f: F) -> Result<Option<usize>, Self::Error>
where Self: Sized, F: FnMut(Self::Item) -> Result<bool, Self::Error>,

Returns the position of the first element of this iterator that matches a predicate. The predicate may fail; such failures are returned to the caller.
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fn max(self) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, Self::Item: Ord,

Returns the maximal element of the iterator.
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fn max_by_key<B, F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, B: Ord, F: FnMut(&Self::Item) -> Result<B, Self::Error>,

Returns the element of the iterator which gives the maximum value from the function.
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fn max_by<F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Result<Ordering, Self::Error>,

Returns the element that gives the maximum value with respect to the function.
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fn min(self) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, Self::Item: Ord,

Returns the minimal element of the iterator.
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fn min_by_key<B, F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, B: Ord, F: FnMut(&Self::Item) -> Result<B, Self::Error>,

Returns the element of the iterator which gives the minimum value from the function.
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fn min_by<F>(self, f: F) -> Result<Option<Self::Item>, Self::Error>
where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Result<Ordering, Self::Error>,

Returns the element that gives the minimum value with respect to the function.
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fn unzip<A, B, FromA, FromB>(self) -> Result<(FromA, FromB), Self::Error>
where Self: Sized + FallibleIterator<Item = (A, B)>, FromA: Default + Extend<A>, FromB: Default + Extend<B>,

Converts an iterator of pairs into a pair of containers.
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fn cloned<'a, T>(self) -> Cloned<Self>
where Self: Sized + FallibleIterator<Item = &'a T>, T: 'a + Clone,

Returns an iterator which clones all of its elements.
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fn cmp<I>(self, other: I) -> Result<Ordering, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Item = Self::Item, Error = Self::Error>, Self::Item: Ord,

Lexicographically compares the elements of this iterator to that of another.
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fn partial_cmp<I>(self, other: I) -> Result<Option<Ordering>, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialOrd<<I as IntoFallibleIterator>::Item>,

Lexicographically compares the elements of this iterator to that of another.
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fn eq<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialEq<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are equal to those of another.
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fn ne<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialEq<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are not equal to those of another.
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fn lt<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialOrd<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are lexicographically less than those of another.
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fn le<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialOrd<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are lexicographically less than or equal to those of another.
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fn gt<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialOrd<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are lexicographically greater than those of another.
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fn ge<I>(self, other: I) -> Result<bool, Self::Error>
where Self: Sized, I: IntoFallibleIterator<Error = Self::Error>, Self::Item: PartialOrd<<I as IntoFallibleIterator>::Item>,

Determines if the elements of this iterator are lexicographically greater than or equal to those of another.
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fn iterator(self) -> Iterator<Self>
where Self: Sized,

Returns a normal (non-fallible) iterator over Result<Item, Error>.
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fn map_err<B, F>(self, f: F) -> MapErr<Self, F>
where F: FnMut(Self::Error) -> B, Self: Sized,

Returns an iterator which applies a transform to the errors of the underlying iterator.
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fn unwrap<T>(self) -> Unwrap<Self>
where Self: Sized + FallibleIterator<Item = T>, Self::Error: Debug,

Returns an iterator which unwraps all of its elements.

Auto Trait Implementations§

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impl<'stmt, F> !Crossing for Map<'stmt, F>

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impl<'stmt, F> Freeze for Map<'stmt, F>
where F: Freeze,

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impl<'stmt, F> !ObjSafe for Map<'stmt, F>

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impl<'stmt, F> !RefUnwindSafe for Map<'stmt, F>

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impl<'stmt, F> !Send for Map<'stmt, F>

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impl<'stmt, F> StoreCopy for Map<'stmt, F>
where F: StoreCopy,

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impl<'stmt, F> !Sync for Map<'stmt, F>

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impl<'stmt, F> Unpin for Map<'stmt, F>
where F: Unpin,

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impl<'stmt, F> !UnwindSafe for Map<'stmt, F>

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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<I> IntoFallibleIterator for I
where I: FallibleIterator,

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type Item = <I as FallibleIterator>::Item

The elements of the iterator.
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type Error = <I as FallibleIterator>::Error

The error value of the iterator.
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type IntoFallibleIter = I

The iterator.
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fn into_fallible_iter(self) -> I

Creates a fallible iterator from a value.
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impl<D> OwoColorize for D

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fn fg<C>(&self) -> FgColorDisplay<'_, C, Self>
where C: Color,

Set the foreground color generically Read more
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fn bg<C>(&self) -> BgColorDisplay<'_, C, Self>
where C: Color,

Set the background color generically. Read more
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fn black(&self) -> FgColorDisplay<'_, Black, Self>

Change the foreground color to black
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fn on_black(&self) -> BgColorDisplay<'_, Black, Self>

Change the background color to black
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fn red(&self) -> FgColorDisplay<'_, Red, Self>

Change the foreground color to red
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fn on_red(&self) -> BgColorDisplay<'_, Red, Self>

Change the background color to red
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fn green(&self) -> FgColorDisplay<'_, Green, Self>

Change the foreground color to green
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fn on_green(&self) -> BgColorDisplay<'_, Green, Self>

Change the background color to green
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fn yellow(&self) -> FgColorDisplay<'_, Yellow, Self>

Change the foreground color to yellow
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fn on_yellow(&self) -> BgColorDisplay<'_, Yellow, Self>

Change the background color to yellow
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fn blue(&self) -> FgColorDisplay<'_, Blue, Self>

Change the foreground color to blue
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fn on_blue(&self) -> BgColorDisplay<'_, Blue, Self>

Change the background color to blue
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fn magenta(&self) -> FgColorDisplay<'_, Magenta, Self>

Change the foreground color to magenta
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fn on_magenta(&self) -> BgColorDisplay<'_, Magenta, Self>

Change the background color to magenta
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fn purple(&self) -> FgColorDisplay<'_, Magenta, Self>

Change the foreground color to purple
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fn on_purple(&self) -> BgColorDisplay<'_, Magenta, Self>

Change the background color to purple
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fn cyan(&self) -> FgColorDisplay<'_, Cyan, Self>

Change the foreground color to cyan
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fn on_cyan(&self) -> BgColorDisplay<'_, Cyan, Self>

Change the background color to cyan
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fn white(&self) -> FgColorDisplay<'_, White, Self>

Change the foreground color to white
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fn on_white(&self) -> BgColorDisplay<'_, White, Self>

Change the background color to white
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fn default_color(&self) -> FgColorDisplay<'_, Default, Self>

Change the foreground color to the terminal default
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fn on_default_color(&self) -> BgColorDisplay<'_, Default, Self>

Change the background color to the terminal default
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fn bright_black(&self) -> FgColorDisplay<'_, BrightBlack, Self>

Change the foreground color to bright black
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fn on_bright_black(&self) -> BgColorDisplay<'_, BrightBlack, Self>

Change the background color to bright black
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fn bright_red(&self) -> FgColorDisplay<'_, BrightRed, Self>

Change the foreground color to bright red
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fn on_bright_red(&self) -> BgColorDisplay<'_, BrightRed, Self>

Change the background color to bright red
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fn bright_green(&self) -> FgColorDisplay<'_, BrightGreen, Self>

Change the foreground color to bright green
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fn on_bright_green(&self) -> BgColorDisplay<'_, BrightGreen, Self>

Change the background color to bright green
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fn bright_yellow(&self) -> FgColorDisplay<'_, BrightYellow, Self>

Change the foreground color to bright yellow
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fn on_bright_yellow(&self) -> BgColorDisplay<'_, BrightYellow, Self>

Change the background color to bright yellow
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fn bright_blue(&self) -> FgColorDisplay<'_, BrightBlue, Self>

Change the foreground color to bright blue
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fn on_bright_blue(&self) -> BgColorDisplay<'_, BrightBlue, Self>

Change the background color to bright blue
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fn bright_magenta(&self) -> FgColorDisplay<'_, BrightMagenta, Self>

Change the foreground color to bright magenta
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fn on_bright_magenta(&self) -> BgColorDisplay<'_, BrightMagenta, Self>

Change the background color to bright magenta
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fn bright_purple(&self) -> FgColorDisplay<'_, BrightMagenta, Self>

Change the foreground color to bright purple
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fn on_bright_purple(&self) -> BgColorDisplay<'_, BrightMagenta, Self>

Change the background color to bright purple
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fn bright_cyan(&self) -> FgColorDisplay<'_, BrightCyan, Self>

Change the foreground color to bright cyan
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fn on_bright_cyan(&self) -> BgColorDisplay<'_, BrightCyan, Self>

Change the background color to bright cyan
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fn bright_white(&self) -> FgColorDisplay<'_, BrightWhite, Self>

Change the foreground color to bright white
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fn on_bright_white(&self) -> BgColorDisplay<'_, BrightWhite, Self>

Change the background color to bright white
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fn bold(&self) -> BoldDisplay<'_, Self>

Make the text bold
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fn dimmed(&self) -> DimDisplay<'_, Self>

Make the text dim
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fn italic(&self) -> ItalicDisplay<'_, Self>

Make the text italicized
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fn underline(&self) -> UnderlineDisplay<'_, Self>

Make the text underlined
Make the text blink
Make the text blink (but fast!)
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fn reversed(&self) -> ReversedDisplay<'_, Self>

Swap the foreground and background colors
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fn hidden(&self) -> HiddenDisplay<'_, Self>

Hide the text
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fn strikethrough(&self) -> StrikeThroughDisplay<'_, Self>

Cross out the text
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fn color<Color>(&self, color: Color) -> FgDynColorDisplay<'_, Color, Self>
where Color: DynColor,

Set the foreground color at runtime. Only use if you do not know which color will be used at compile-time. If the color is constant, use either [OwoColorize::fg] or a color-specific method, such as [OwoColorize::green], Read more
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fn on_color<Color>(&self, color: Color) -> BgDynColorDisplay<'_, Color, Self>
where Color: DynColor,

Set the background color at runtime. Only use if you do not know what color to use at compile-time. If the color is constant, use either [OwoColorize::bg] or a color-specific method, such as [OwoColorize::on_yellow], Read more
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fn fg_rgb<const R: u8, const G: u8, const B: u8>( &self, ) -> FgColorDisplay<'_, CustomColor<R, G, B>, Self>

Set the foreground color to a specific RGB value.
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fn bg_rgb<const R: u8, const G: u8, const B: u8>( &self, ) -> BgColorDisplay<'_, CustomColor<R, G, B>, Self>

Set the background color to a specific RGB value.
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fn truecolor(&self, r: u8, g: u8, b: u8) -> FgDynColorDisplay<'_, Rgb, Self>

Sets the foreground color to an RGB value.
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fn on_truecolor(&self, r: u8, g: u8, b: u8) -> BgDynColorDisplay<'_, Rgb, Self>

Sets the background color to an RGB value.
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fn style(&self, style: Style) -> Styled<&Self>

Apply a runtime-determined style
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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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more