Struct quickcheck::Gen

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pub struct Gen { /* private fields */ }
Expand description

Gen represents a PRNG.

It is the source of randomness from which QuickCheck will generate values. An instance of Gen is passed to every invocation of Arbitrary::arbitrary, which permits callers to use lower level RNG routines to generate values.

It is unspecified whether this is a secure RNG or not. Therefore, callers should assume it is insecure.

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impl Gen

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pub fn new(size: usize) -> Gen

Returns a Gen with the given size configuration.

The size parameter controls the size of random values generated. For example, it specifies the maximum length of a randomly generated vector, but is and should not be used to control the range of a randomly generated number. (Unless that number is used to control the size of a data structure.)

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pub fn size(&self) -> usize

Returns the size configured with this generator.

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pub fn choose<'a, T>(&mut self, slice: &'a [T]) -> Option<&'a T>

Choose among the possible alternatives in the slice given. If the slice is empty, then None is returned. Otherwise, a non-None value is guaranteed to be returned.

Auto Trait Implementations§

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impl Freeze for Gen

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impl RefUnwindSafe for Gen

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impl Send for Gen

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impl Sync for Gen

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impl Unpin for Gen

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impl UnwindSafe for Gen

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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, 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