Struct SpareCapacity

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pub struct SpareCapacity<'a, T>(/* private fields */);
Available on crate feature alloc only.
Expand description

A type that implements Buffer by appending to a Vec, up to its capacity.

To use this, use the spare_capacity function.

Because this uses the capacity, and never reallocates, the Vec should have some non-empty spare capacity.

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impl<'a, T> Buffer<T> for SpareCapacity<'a, T>

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type Output = usize

The number of elements written into the buffer.

This is somewhat redundant, as set_len is also called on the referenced Vec, however it can be convenient in some cases, such as for testing for end-of-stream.

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fn buffer_ptr(&mut self) -> *mut T

Return a raw mutable pointer to the underlying buffer. Read more
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fn buffer_len(&self) -> usize

Return the length in elements of the underlying buffer.
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unsafe fn assume_init(self, len: usize) -> Self::Output

Assert that len elements were written to, and provide a return value. Read more
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fn cursor(self) -> Cursor<T, Self>

Return a Cursor for safely writing to the buffer. Read more

Auto Trait Implementations§

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impl<'a, T> Freeze for SpareCapacity<'a, T>

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impl<'a, T> RefUnwindSafe for SpareCapacity<'a, T>
where T: RefUnwindSafe,

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impl<'a, T> Send for SpareCapacity<'a, T>
where T: Send,

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impl<'a, T> Sync for SpareCapacity<'a, T>
where T: Sync,

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impl<'a, T> Unpin for SpareCapacity<'a, T>

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impl<'a, T> !UnwindSafe for SpareCapacity<'a, T>

Blanket Implementations§

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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.