predicates::function

Struct FnPredicate

Source
pub struct FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,
{ /* private fields */ }
Expand description

Predicate that wraps a function over a reference that returns a bool. This type is returned by the predicate::function function.

Implementations§

Source§

impl<F, T> FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,

Source

pub fn fn_name(self, name: &'static str) -> Self

Provide a descriptive name for this function.

§Examples
use predicates::prelude::*;

struct Example {
    string: String,
    number: i32,
}

let string_check = predicate::function(|x: &Example| x.string == "hello")
    .fn_name("is_hello");
println!("predicate: {}", string_check);

Trait Implementations§

Source§

impl<F, T> Clone for FnPredicate<F, T>
where F: Fn(&T) -> bool + Clone, T: ?Sized + Clone,

Source§

fn clone(&self) -> FnPredicate<F, T>

Returns a copy of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
Source§

impl<F, T> Debug for FnPredicate<F, T>
where F: Fn(&T) -> bool + Debug, T: ?Sized + Debug,

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<F, T> Display for FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<F, T> PartialEq for FnPredicate<F, T>
where F: Fn(&T) -> bool + PartialEq, T: ?Sized + PartialEq,

Source§

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 · Source§

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

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

impl<F, T> Predicate<T> for FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,

Source§

fn eval(&self, variable: &T) -> bool

Execute this Predicate against variable, returning the resulting boolean.
Source§

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

Find a case that proves this predicate as expected when run against variable.
Source§

impl<F, T> PredicateReflection for FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,

Source§

fn parameters<'a>(&'a self) -> Box<dyn Iterator<Item = Parameter<'a>> + 'a>

Parameters of the current Predicate.
Source§

fn children<'a>(&'a self) -> Box<dyn Iterator<Item = Child<'a>> + 'a>

Nested Predicates of the current Predicate.
Source§

impl<F, T> Copy for FnPredicate<F, T>
where F: Fn(&T) -> bool + Copy, T: ?Sized + Copy,

Source§

impl<F, T> Eq for FnPredicate<F, T>
where F: Fn(&T) -> bool + Eq, T: ?Sized + Eq,

Source§

impl<F, T> StructuralPartialEq for FnPredicate<F, T>
where F: Fn(&T) -> bool, T: ?Sized,

Auto Trait Implementations§

§

impl<F, T> Freeze for FnPredicate<F, T>
where F: Freeze, T: ?Sized,

§

impl<F, T> RefUnwindSafe for FnPredicate<F, T>

§

impl<F, T> Send for FnPredicate<F, T>
where F: Send, T: Send + ?Sized,

§

impl<F, T> Sync for FnPredicate<F, T>
where F: Sync, T: Sync + ?Sized,

§

impl<F, T> Unpin for FnPredicate<F, T>
where F: Unpin, T: Unpin + ?Sized,

§

impl<F, T> UnwindSafe for FnPredicate<F, T>
where F: UnwindSafe, T: UnwindSafe + ?Sized,

Blanket Implementations§

Source§

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

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

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

Mutably borrows from an owned value. Read more
Source§

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

Source§

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
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

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

Source§

fn into(self) -> U

Calls U::from(self).

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

Source§

impl<P, Item> PredicateBooleanExt<Item> for P
where P: Predicate<Item>, Item: ?Sized,

Source§

fn and<B>(self, other: B) -> AndPredicate<Self, B, Item>
where B: Predicate<Item>, Self: Sized,

Compute the logical AND of two Predicate results, returning the result. Read more
Source§

fn or<B>(self, other: B) -> OrPredicate<Self, B, Item>
where B: Predicate<Item>, Self: Sized,

Compute the logical OR of two Predicate results, returning the result. Read more
Source§

fn not(self) -> NotPredicate<Self, Item>
where Self: Sized,

Compute the logical NOT of a Predicate, returning the result. Read more
Source§

impl<P, Item> PredicateBoxExt<Item> for P
where P: Predicate<Item>,

Source§

fn boxed(self) -> BoxPredicate<Item>
where Self: Sized + Send + Sync + 'static,

Returns a BoxPredicate wrapper around this Predicate type. Read more
Source§

impl<P> PredicateFileContentExt for P
where P: Predicate<[u8]>,

Source§

fn from_file_path(self) -> FileContentPredicate<Self>

Returns a FileContentPredicate that adapts Self to a file content Predicate. Read more
Source§

impl<P, Item> PredicateNameExt<Item> for P
where P: Predicate<Item>, Item: ?Sized,

Source§

fn name(self, name: &'static str) -> NamePredicate<Self, Item>
where Self: Sized,

Name a predicate expression. Read more
Source§

impl<P> PredicateStrExt for P
where P: Predicate<str>,

Source§

fn trim(self) -> TrimPredicate<Self>

Returns a TrimPredicate that ensures the data passed to Self is trimmed. Read more
Source§

fn from_utf8(self) -> Utf8Predicate<Self>

Returns a Utf8Predicate that adapts Self to a [u8] Predicate. Read more
Source§

fn normalize(self) -> NormalizedPredicate<Self>

Returns a NormalizedPredicate that ensures the newlines within the data passed to Self is normalised. Read more
Source§

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

Source§

type Owned = T

The resulting type after obtaining ownership.
Source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

impl<T> ToString for T
where T: Display + ?Sized,

Source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
Source§

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

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

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

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.