cfx_storage::utils::guarded_value

Struct NonCopy

pub struct NonCopy<T: ?Sized>(pub T);

Expand description

To prevent automatic copy from leaking guarded value. Please always wrap the value with NonCopy if the value is Copy otherwise it’s so easy to accidentally copy without notice, e.g. in matching arms, if let clauses.

Tuple Fields§

§0: T

Trait Implementations§

impl<T: Clone + ?Sized> Clone for NonCopy<T>

fn clone(&self) -> NonCopy<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

impl<T: ?Sized> DerefMut for NonCopy<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T: ?Sized> Deref for NonCopy<T>

Ideally, we should also deref to the next level like above. However, there can be GuardedValue like Option<&’a Target>, for which we can’t really do anything more, unless we introduce concept like lifetime coercion classes.

The goal for all implementations here is to make it hard enough to do something wrong by accident, but still keep it simple.

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

Auto Trait Implementations§

impl<T> Freeze for NonCopy<T>
where T: Freeze + ?Sized,

impl<T> RefUnwindSafe for NonCopy<T>
where T: RefUnwindSafe + ?Sized,

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

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

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

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

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

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

unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dst. Read more

impl<D, T> DerefMutPlusSelf for D
where D: DerefMut<Target = T>, T: ?Sized,

type Target = T

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

impl<D, T> DerefPlusSelf for D
where D: Deref<Target = T>, T: ?Sized,

type Target = T

fn deref(&self) -> &T

impl<T> ElementSatisfy<ElementNoConstrain> for T

fn to_constrain_object(&self) -> &ElementNoConstrain

fn to_constrain_object_mut(&mut self) -> &mut ElementNoConstrain

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

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

fn into(self) -> U

Calls U::from(self).

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

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)

The target type on which the method may be called.

impl<R> Rng for R
where R: RngCore + ?Sized,

fn random<T>(&mut self) -> T
where StandardUniform: Distribution<T>,

Return a random value via the StandardUniform distribution. Read more

fn random_iter<T>(self) -> Iter<StandardUniform, Self, T>
where Self: Sized, StandardUniform: Distribution<T>,

Return an iterator over random variates Read more

fn random_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

Generate a random value in the given range. Read more

fn random_bool(&mut self, p: f64) -> bool

Return a bool with a probability p of being true. Read more

fn random_ratio(&mut self, numerator: u32, denominator: u32) -> bool

Return a bool with a probability of numerator/denominator of being true. Read more

fn sample<T, D>(&mut self, distr: D) -> T
where D: Distribution<T>,

Sample a new value, using the given distribution. Read more

fn sample_iter<T, D>(self, distr: D) -> Iter<D, Self, T>
where D: Distribution<T>, Self: Sized,

Create an iterator that generates values using the given distribution. Read more

fn fill<T>(&mut self, dest: &mut T)
where T: Fill + ?Sized,

Fill any type implementing Fill with random data Read more

fn gen<T>(&mut self) -> T
where StandardUniform: Distribution<T>,

👎Deprecated since 0.9.0: Renamed to random to avoid conflict with the new gen keyword in Rust 2024.

Alias for Rng::random.

fn gen_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

👎Deprecated since 0.9.0: Renamed to random_range

Alias for Rng::random_range.

fn gen_bool(&mut self, p: f64) -> bool

👎Deprecated since 0.9.0: Renamed to random_bool

Alias for Rng::random_bool.

fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool

👎Deprecated since 0.9.0: Renamed to random_ratio

Alias for Rng::random_ratio.

impl<T> RngCore for T
where T: DerefMut, <T as Deref>::Target: RngCore,

fn next_u32(&mut self) -> u32

Return the next random u32. Read more

fn next_u64(&mut self) -> u64

Return the next random u64. Read more

fn fill_bytes(&mut self, dst: &mut [u8])

Fill dest with random data. Read more

impl<T> Same for T

type Output = T

Should always be Self

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

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

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

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

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

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

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

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

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

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<R> TryRngCore for R
where R: RngCore + ?Sized,

type Error = Infallible

The type returned in the event of a RNG error.

fn try_next_u32(&mut self) -> Result<u32, <R as TryRngCore>::Error>

Return the next random u32.

fn try_next_u64(&mut self) -> Result<u64, <R as TryRngCore>::Error>

Return the next random u64.

fn try_fill_bytes( &mut self, dst: &mut [u8], ) -> Result<(), <R as TryRngCore>::Error>

Fill dest entirely with random data.

fn unwrap_err(self) -> UnwrapErr<Self>
where Self: Sized,

Wrap RNG with the UnwrapErr wrapper.

fn unwrap_mut(&mut self) -> UnwrapMut<'_, Self>

Wrap RNG with the UnwrapMut wrapper.

fn read_adapter(&mut self) -> RngReadAdapter<'_, Self>
where Self: Sized,

Convert an RngCore to a RngReadAdapter.

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

fn vzip(self) -> V

impl<T> CryptoRng for T
where T: DerefMut, <T as Deref>::Target: CryptoRng,

impl<R> TryCryptoRng for R
where R: CryptoRng + ?Sized,