Struct proptest::strategy::Filter

pub struct Filter<S, F> { /* fields omitted */ }

Strategy and ValueTree filter adaptor.

See Strategy::prop_filter().

Trait Implementations

impl<S: Debug, F: Debug> Debug for Filter<S, F>

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<S: Clone, F> Clone for Filter<S, F>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<S: Strategy, F: Fn(&<S::Value as ValueTree>::Value) -> bool> Strategy for Filter<S, F>

type Value = Filter<S::Value, F>

The value tree generated by this Strategy.

fn new_value(&self, runner: &mut TestRunner) -> Result<Self::Value, String>

Generate a new value tree from the given runner.

fn prop_map<O: Debug, F: Fn(<Self::Value as ValueTree>::Value) -> O>(
    self,
    fun: F
) -> Map<Self, F> where
    Self: Sized, 

Returns a strategy which produces values transformed by the function fun.

fn prop_filter<F: Fn(&<Self::Value as ValueTree>::Value) -> bool>(
    self,
    whence: String,
    fun: F
) -> Filter<Self, F> where
    Self: Sized, 

Returns a strategy which only produces values accepted by fun.

fn prop_union(self, other: Self) -> Union<Self> where
    Self: Sized, 

Returns a strategy which picks uniformly from self and other.

fn boxed(self) -> BoxedStrategy<<Self::Value as ValueTree>::Value> where
    Self: Sized + 'static, 

Erases the type of this Strategy so it can be passed around as a simple trait object.

impl<S: ValueTree, F: Fn(&S::Value) -> bool> ValueTree for Filter<S, F>

type Value = S::Value

The type of the value produced by this ValueTree.

fn current(&self) -> S::Value

Returns the current value.

fn simplify(&mut self) -> bool

Attempts to simplify the current value. Notionally, this sets the "high" value to the current value, and the current value to a "halfway point" between high and low, rounding towards low.

fn complicate(&mut self) -> bool

Attempts to partially undo the last simplification. Notionally, this sets the "low" value to one plus the current value, and the current value to a "halfway point" between high and the new low, rounding towards low.