Trait StorageStack 

pub trait StorageStack {
    // Required methods
    fn new_with(&self, offset: Offset) -> Self;
    fn offset(&self) -> Offset;
    fn push<T>(&mut self, t: T) -> Result<(), Error>
       where T: ArgumentEncoder;
    fn pop<T>(&mut self) -> Result<T, Error>
       where T: for<'de> ArgumentDecoder<'de>;
    fn seek_prev(&mut self) -> Result<(), Error>;
}

Stack interface for stable memory that supports push and pop of arbitrary values that implement the Candid interface.

Required Methods

fn new_with(&self, offset: Offset) -> Self

Return a new StorageStack object with the given offset.

fn offset(&self) -> Offset

Return the current read/write offset.

fn push<T>(&mut self, t: T) -> Result<(), Error>

where T: ArgumentEncoder,

Push a value to the end of the stack.

fn pop<T>(&mut self) -> Result<T, Error>

where T: for<'de> ArgumentDecoder<'de>,

Pop a value from the end of the stack. In case of OutOfBounds error, offset is not changed. In case of Candid decoding error, offset may be changed.

fn seek_prev(&mut self) -> Result<(), Error>

Seek to the start of previous value by changing the offset. This is similar to pop but without reading the actual value.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl StorageStack for StableStorage

impl StorageStack for Stack