pub struct DroplessArena {
    pub(crate) start: Cell<*mut u8>,
    pub(crate) end: Cell<*mut u8>,
    pub(crate) chunks: RefCell<Vec<ArenaChunk>>,
}
Expand description

An arena that can hold objects of multiple different types that impl Copy and/or satisfy !mem::needs_drop.

Fields

start: Cell<*mut u8>

A pointer to the start of the free space.

end: Cell<*mut u8>

A pointer to the end of free space.

The allocation proceeds downwards from the end of the chunk towards the start. (This is slightly simpler and faster than allocating upwards, see https://fitzgeraldnick.com/2019/11/01/always-bump-downwards.html.) When this pointer crosses the start pointer, a new chunk is allocated.

chunks: RefCell<Vec<ArenaChunk>>

A vector of arena chunks.

Implementations

Allocates a byte slice with specified layout from the current memory chunk. Returns None if there is no free space left to satisfy the request.

Allocates a slice of objects that are copied into the DroplessArena, returning a mutable reference to it. Will panic if passed a zero-sized type.

Panics:

  • Zero-sized types
  • Zero-length slices

Trait Implementations

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

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes