Struct OptionBrand 

pub struct OptionBrand;

Brand for Option.

Trait Implementations

impl ApplyFirst for OptionBrand

fn apply_first<'a, A: 'a + Clone, B: 'a + Clone>( fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, fb: <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>

Combines two contexts, keeping the value from the first context.

impl ApplySecond for OptionBrand

fn apply_second<'a, A: 'a + Clone, B: 'a + Clone>( fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, fb: <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>

Combines two contexts, keeping the value from the second context.

impl Clone for OptionBrand

fn clone(&self) -> OptionBrand

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Compactable for OptionBrand

fn compact<'a, A: 'a>( fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, <OptionBrand as Kind_cdc7cd43dac7585f>::Of<'a, A>>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>

Compacts a nested option.

This method flattens a nested option.

Type Signature

forall A. Option (Option A) -> Option A

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the elements.

Parameters

• fa: The nested option.

Returns

The flattened option.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(Some(5));
let y = compact::<OptionBrand, _>(x);
assert_eq!(y, Some(5));

fn separate<'a, E: 'a, O: 'a>( fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, Result<O, E>>, ) -> (<Self as Kind_cdc7cd43dac7585f>::Of<'a, E>, <Self as Kind_cdc7cd43dac7585f>::Of<'a, O>)

Separates an option of result.

This method separates an option of result into a pair of options.

Type Signature

forall E O. Option (Result O E) -> (Option E, Option O)

Type Parameters

• 'a: The lifetime of the values.
• E: The type of the error value.
• O: The type of the success value.

Parameters

• fa: The option of result.

Returns

A pair of options.

Examples

use fp_library::{brands::*, functions::*};

let x: Option<Result<i32, &str>> = Some(Ok(5));
let (errs, oks) = separate::<OptionBrand, _, _>(x);
assert_eq!(oks, Some(5));
assert_eq!(errs, None);

impl Debug for OptionBrand

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

Formats the value using the given formatter.

impl Default for OptionBrand

fn default() -> OptionBrand

Returns the “default value” for a type.

impl Filterable for OptionBrand

fn partition_map<'a, A: 'a, E: 'a, O: 'a, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> (<Self as Kind_cdc7cd43dac7585f>::Of<'a, E>, <Self as Kind_cdc7cd43dac7585f>::Of<'a, O>)

where Func: Fn(A) -> Result<O, E> + 'a,

Partitions an option based on a function that returns a result.

This method partitions an option based on a function that returns a result.

Type Signature

forall A E O. (A -> Result O E, Option A) -> (Option E, Option O)

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the input value.
• E: The type of the error value.
• O: The type of the success value.
• Func: The type of the function to apply.

Parameters

• func: The function to apply.
• fa: The option to partition.

Returns

A pair of options.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let (errs, oks) = partition_map::<OptionBrand, _, _, _, _>(|a| if a > 2 { Ok(a) } else { Err(a) }, x);
assert_eq!(oks, Some(5));
assert_eq!(errs, None);

fn partition<'a, A: 'a + Clone, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> (<Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>)

where Func: Fn(A) -> bool + 'a,

Partitions an option based on a predicate.

This method partitions an option based on a predicate.

Type Signature

forall A. (A -> bool, Option A) -> (Option A, Option A)

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the elements.
• Func: The type of the predicate.

Parameters

• func: The predicate.
• fa: The option to partition.

Returns

A pair of options.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let (not_satisfied, satisfied) = partition::<OptionBrand, _, _>(|a| a > 2, x);
assert_eq!(satisfied, Some(5));
assert_eq!(not_satisfied, None);

fn filter_map<'a, A: 'a, B: 'a, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>

where Func: Fn(A) -> Option<B> + 'a,

Maps a function over an option and filters out None results.

This method maps a function over an option and filters out None results.

Type Signature

forall A B. (A -> Option B, Option A) -> Option B

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the input value.
• B: The type of the result of applying the function.
• Func: The type of the function to apply.

Parameters

• func: The function to apply.
• fa: The option to filter and map.

Returns

The filtered and mapped option.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(5);
let y = filter_map::<OptionBrand, _, _, _>(|a| if a > 2 { Some(a * 2) } else { None }, x);
assert_eq!(y, Some(10));

fn filter<'a, A: 'a + Clone, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>

where Func: Fn(A) -> bool + 'a,

Filters an option based on a predicate.

This method filters an option based on a predicate.

Type Signature

forall A. (A -> bool, Option A) -> Option A

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the elements.
• Func: The type of the predicate.

Parameters

• func: The predicate.
• fa: The option to filter.

Returns

The filtered option.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(5);
let y = filter::<OptionBrand, _, _>(|a| a > 2, x);
assert_eq!(y, Some(5));

impl Foldable for OptionBrand

fn fold_right<'a, FnBrand, A: 'a, B: 'a, Func>( func: Func, initial: B, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> B

where Func: Fn(A, B) -> B + 'a, FnBrand: CloneableFn + 'a,

Folds the option from the right.

This method performs a right-associative fold of the option. If the option is Some(a), it applies the function to a and the initial value. If None, it returns the initial value.

Type Signature

forall A B. ((A, B) -> B, B, Option A) -> B

Type Parameters

• 'a: The lifetime of the values.
• FnBrand: The brand of the cloneable function to use.
• A: The type of the elements in the structure.
• B: The type of the accumulator.
• Func: The type of the folding function.

Parameters

• func: The folding function.
• initial: The initial value.
• fa: The option to fold.

Returns

func(a, initial) if fa is Some(a), otherwise initial.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let y = fold_right::<RcFnBrand, OptionBrand, _, _, _>(|a, b| a + b, 10, x);
assert_eq!(y, 15);

fn fold_left<'a, FnBrand, A: 'a, B: 'a, Func>( func: Func, initial: B, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> B

where Func: Fn(B, A) -> B + 'a, FnBrand: CloneableFn + 'a,

Folds the option from the left.

This method performs a left-associative fold of the option. If the option is Some(a), it applies the function to the initial value and a. If None, it returns the initial value.

Type Signature

forall A B. ((B, A) -> B, B, Option A) -> B

Type Parameters

• 'a: The lifetime of the values.
• FnBrand: The brand of the cloneable function to use.
• A: The type of the elements in the structure.
• B: The type of the accumulator.
• Func: The type of the folding function.

Parameters

• func: The function to apply to the accumulator and each element.
• initial: The initial value of the accumulator.
• fa: The option to fold.

Returns

f(initial, a) if fa is Some(a), otherwise initial.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let y = fold_left::<RcFnBrand, OptionBrand, _, _, _>(|b, a| b + a, 10, x);
assert_eq!(y, 15);

fn fold_map<'a, FnBrand, A: 'a, M, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> M

where M: Monoid + 'a, Func: Fn(A) -> M + 'a, FnBrand: CloneableFn + 'a,

Maps the value to a monoid and returns it, or returns empty.

This method maps the element of the option to a monoid. If the option is None, it returns the monoid’s identity element.

Type Signature

forall A M. Monoid M => (A -> M, Option A) -> M

Type Parameters

• 'a: The lifetime of the values.
• FnBrand: The brand of the cloneable function to use.
• A: The type of the elements in the structure.
• M: The type of the monoid.
• Func: The type of the mapping function.

Parameters

• func: The mapping function.
• fa: The option to fold.

Returns

func(a) if fa is Some(a), otherwise M::empty().

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let y = fold_map::<RcFnBrand, OptionBrand, _, _, _>(|a: i32| a.to_string(), x);
assert_eq!(y, "5".to_string());

impl Functor for OptionBrand

fn map<'a, A: 'a, B: 'a, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>

where Func: Fn(A) -> B + 'a,

Maps a function over the value in the option.

This method applies a function to the value inside the option, producing a new option with the transformed value. If the option is None, it returns None.

Type Signature

forall A B. (A -> B, Option A) -> Option B

Type Parameters

• 'a: The lifetime of the value.
• A: The type of the value inside the option.
• B: The type of the result of applying the function.
• Func: The type of the function to apply.

Parameters

• func: The function to apply to the value.
• fa: The option to map over.

Returns

A new option containing the result of applying the function, or None.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let y = map::<OptionBrand, _, _, _>(|i| i * 2, x);
assert_eq!(y, Some(10));

impl Hash for OptionBrand

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Kind_cdc7cd43dac7585f for OptionBrand

Generated implementation of Kind_cdc7cd43dac7585f for OptionBrand.

type Of<'a, A: 'a> = Option<A>

The applied type.

impl Lift for OptionBrand

fn lift2<'a, A, B, C, Func>( func: Func, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, fb: <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, C>

where Func: Fn(A, B) -> C + 'a, A: 'a, B: 'a, C: 'a,

Lifts a binary function into the option context.

This method lifts a binary function to operate on values within the option context.

Type Signature

forall A B C. ((A, B) -> C, Option A, Option B) -> Option C

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the first option’s value.
• B: The type of the second option’s value.
• C: The return type of the function.
• Func: The type of the binary function.

Parameters

• func: The binary function to apply.
• fa: The first option.
• fb: The second option.

Returns

Some(f(a, b)) if both options are Some, otherwise None.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(1);
let y = Some(2);
let z = lift2::<OptionBrand, _, _, _, _>(|a, b| a + b, x, y);
assert_eq!(z, Some(3));

impl Ord for OptionBrand

fn cmp(&self, other: &OptionBrand) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl ParFoldable for OptionBrand

fn par_fold_map<'a, FnBrand, A, M>( func: <FnBrand as SendCloneableFn>::SendOf<'a, A, M>, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> M

where FnBrand: 'a + SendCloneableFn, A: 'a + Clone + Send + Sync, M: Monoid + Send + Sync + 'a,

Maps the value to a monoid and returns it, or returns empty, in parallel.

This method maps the element of the option to a monoid. Since Option contains at most one element, no actual parallelism occurs, but the interface is satisfied.

Type Signature

forall A M. Monoid M => (A -> M, Option A) -> M

Type Parameters

• 'a: The lifetime of the values.
• FnBrand: The brand of the cloneable function wrapper.
• A: The element type.
• M: The monoid type.

Parameters

• func: The mapping function.
• fa: The option to fold.

Returns

The combined monoid value.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(1);
let f = send_cloneable_fn_new::<ArcFnBrand, _, _>(|x: i32| x.to_string());
let y = par_fold_map::<ArcFnBrand, OptionBrand, _, _>(f, x);
assert_eq!(y, "1".to_string());

fn par_fold_right<'a, FnBrand, A, B>( func: <FnBrand as SendCloneableFn>::SendOf<'a, (A, B), B>, init: B, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> B

where A: 'a + Clone + Send + Sync, B: Send + Sync + 'a, FnBrand: 'a + SendCloneableFn,

Parallel version of fold_right.

impl PartialEq for OptionBrand

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for OptionBrand

fn partial_cmp(&self, other: &OptionBrand) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Pointed for OptionBrand

fn pure<'a, A: 'a>(a: A) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>

Wraps a value in an option.

This method wraps a value in an option context.

Type Signature

forall A. A -> Option A

Type Parameters

• 'a: The lifetime of the value.
• A: The type of the value to wrap.

Parameters

• a: The value to wrap.

Returns

Some(a).

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = pure::<OptionBrand, _>(5);
assert_eq!(x, Some(5));

impl Semiapplicative for OptionBrand

fn apply<'a, FnBrand: 'a + CloneableFn, A: 'a + Clone, B: 'a>( ff: <Self as Kind_cdc7cd43dac7585f>::Of<'a, <FnBrand as CloneableFn>::Of<'a, A, B>>, fa: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>

Applies a wrapped function to a wrapped value.

This method applies a function wrapped in an option to a value wrapped in an option.

Type Signature

forall A B. (Option (A -> B), Option A) -> Option B

Type Parameters

• 'a: The lifetime of the values.
• FnBrand: The brand of the cloneable function wrapper.
• A: The type of the input value.
• B: The type of the output value.

Parameters

• ff: The option containing the function.
• fa: The option containing the value.

Returns

Some(f(a)) if both are Some, otherwise None.

Examples

use fp_library::{brands::*, classes::*, functions::*};

let f = Some(cloneable_fn_new::<RcFnBrand, _, _>(|x: i32| x * 2));
let x = Some(5);
let y = apply::<RcFnBrand, OptionBrand, _, _>(f, x);
assert_eq!(y, Some(10));

impl Semimonad for OptionBrand

fn bind<'a, A: 'a, B: 'a, Func>( ma: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, func: Func, ) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>

where Func: Fn(A) -> <Self as Kind_cdc7cd43dac7585f>::Of<'a, B> + 'a,

Chains option computations.

This method chains two option computations, where the second computation depends on the result of the first.

Type Signature

forall A B. (Option A, A -> Option B) -> Option B

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the result of the first computation.
• B: The type of the result of the second computation.
• Func: The type of the function to apply.

Parameters

• ma: The first option.
• func: The function to apply to the value inside the option.

Returns

The result of applying f to the value if ma is Some, otherwise None.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(5);
let y = bind::<OptionBrand, _, _, _>(x, |i| Some(i * 2));
assert_eq!(y, Some(10));

impl Traversable for OptionBrand

fn traverse<'a, A: 'a + Clone, B: 'a + Clone, F: Applicative, Func>( func: Func, ta: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <F as Kind_cdc7cd43dac7585f>::Of<'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>>

where Func: Fn(A) -> <F as Kind_cdc7cd43dac7585f>::Of<'a, B> + 'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>: Clone,

Traverses the option with an applicative function.

This method maps the element of the option to a computation, evaluates it, and wraps the result in the applicative context. If None, it returns pure(None).

Type Signature

forall A B F. Applicative F => (A -> F B, Option A) -> F (Option B)

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the elements in the traversable structure.
• B: The type of the elements in the resulting traversable structure.
• F: The applicative context.
• Func: The type of the function to apply.

Parameters

• func: The function to apply to each element, returning a value in an applicative context.
• ta: The option to traverse.

Returns

The option wrapped in the applicative context.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(5);
let y = traverse::<OptionBrand, _, _, OptionBrand, _>(|a| Some(a * 2), x);
assert_eq!(y, Some(Some(10)));

fn sequence<'a, A: 'a + Clone, F: Applicative>( ta: <Self as Kind_cdc7cd43dac7585f>::Of<'a, <F as Kind_cdc7cd43dac7585f>::Of<'a, A>>, ) -> <F as Kind_cdc7cd43dac7585f>::Of<'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>>

where <F as Kind_cdc7cd43dac7585f>::Of<'a, A>: Clone, <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>: Clone,

Sequences an option of applicative.

This method evaluates the computation inside the option and wraps the result in the applicative context. If None, it returns pure(None).

Type Signature

forall A F. Applicative F => Option (F A) -> F (Option A)

Type Parameters

• 'a: The lifetime of the values.
• A: The type of the elements in the traversable structure.
• F: The applicative context.

Parameters

• ta: The option containing the applicative value.

Returns

The option wrapped in the applicative context.

Examples

use fp_library::functions::*;
use fp_library::brands::OptionBrand;

let x = Some(Some(5));
let y = sequence::<OptionBrand, _, OptionBrand>(x);
assert_eq!(y, Some(Some(5)));

impl Witherable for OptionBrand

fn wilt<'a, M: Applicative, A: 'a + Clone, E: 'a + Clone, O: 'a + Clone, Func>( func: Func, ta: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <M as Kind_cdc7cd43dac7585f>::Of<'a, (<Self as Kind_cdc7cd43dac7585f>::Of<'a, E>, <Self as Kind_cdc7cd43dac7585f>::Of<'a, O>)>

where Func: Fn(A) -> <M as Kind_cdc7cd43dac7585f>::Of<'a, Result<O, E>> + 'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, Result<O, E>>: Clone, <M as Kind_cdc7cd43dac7585f>::Of<'a, Result<O, E>>: Clone,

Partitions an option based on a function that returns a result in an applicative context.

This method partitions an option based on a function that returns a result in an applicative context.

Type Signature

forall M A E O. Applicative M => (A -> M (Result O E), Option A) -> M (Option E, Option O)

Type Parameters

• 'a: The lifetime of the values.
• M: The applicative context.
• A: The type of the elements in the input structure.
• E: The type of the error values.
• O: The type of the success values.
• Func: The type of the function to apply.

Parameters

• func: The function to apply to each element, returning a Result in an applicative context.
• ta: The option to partition.

Returns

The partitioned option wrapped in the applicative context.

Examples

use fp_library::{functions::*, brands::*};

let x = Some(5);
let y = wilt::<OptionBrand, OptionBrand, _, _, _, _>(|a| Some(if a > 2 { Ok(a) } else { Err(a) }), x);
assert_eq!(y, Some((None, Some(5))));

fn wither<'a, M: Applicative, A: 'a + Clone, B: 'a + Clone, Func>( func: Func, ta: <Self as Kind_cdc7cd43dac7585f>::Of<'a, A>, ) -> <M as Kind_cdc7cd43dac7585f>::Of<'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, B>>

where Func: Fn(A) -> <M as Kind_cdc7cd43dac7585f>::Of<'a, Option<B>> + 'a, <Self as Kind_cdc7cd43dac7585f>::Of<'a, Option<B>>: Clone, <M as Kind_cdc7cd43dac7585f>::Of<'a, Option<B>>: Clone,

Maps a function over an option and filters out None results in an applicative context.

This method maps a function over an option and filters out None results in an applicative context.

Type Signature

forall M A B. Applicative M => (A -> M (Option B), Option A) -> M (Option B)

Type Parameters

• 'a: The lifetime of the values.
• M: The applicative context.
• A: The type of the elements in the input structure.
• B: The type of the result of applying the function.
• Func: The type of the function to apply.

Parameters

• func: The function to apply to each element, returning an Option in an applicative context.
• ta: The option to filter and map.

Returns

The filtered and mapped option wrapped in the applicative context.

Examples

use fp_library::{functions::*, brands::*};

let x = Some(5);
let y = wither::<OptionBrand, OptionBrand, _, _, _>(|a| Some(if a > 2 { Some(a * 2) } else { None }), x);
assert_eq!(y, Some(Some(10)));

impl Copy for OptionBrand

impl Eq for OptionBrand

impl StructuralPartialEq for OptionBrand