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

Context for generating single values out of strategies.

Proptest is designed to be built around “value trees”, which represent a spectrum from complex values to simpler ones. But in some contexts, like benchmarking or generating corpuses, one just wants a single value. This is a convenience struct for that.

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impl ValueGenerator

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pub fn new() -> Self

Creates a new value generator with the default RNG.

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pub fn new_with_rng(rng: TestRng) -> Self

Creates a new value generator with provided RNG

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pub fn deterministic() -> Self

Creates a new value generator with a deterministic RNG.

This generator has a hardcoded seed, so its results are predictable across test runs. However, a new proptest version may change the seed.

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pub fn generate<S: Strategy>(&mut self, strategy: S) -> S::Value

Generates a single value for this strategy.

Panics if generating the new value fails. The only situation in which this can happen is if generating the value causes too many internal rejects.

Trait Implementations§

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impl Default for ValueGenerator

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fn default() -> ValueGenerator

Returns the “default value” for a type. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · 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.

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impl<T> Pointable for T

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const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

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

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V