[−][src]Trait concordium_std::HasContractState

pub trait HasContractState<Error: Default = ()> where
    Self: Read,
    Self: Write<Err = Error>,
    Self: Seek<Err = Error>, {
    type ContractStateData;
    pub fn open(_: Self::ContractStateData) -> Self;

    pub fn size(&self) -> u32;

    pub fn truncate(&mut self, new_size: u32);

    pub fn reserve(&mut self, len: u32) -> bool;
}

A type that can serve as the contract state type.

Associated Types

type ContractStateData[src]

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Required methods

pub fn open(_: Self::ContractStateData) -> Self[src]

Open the contract state. Only one instance can be opened at the same time.

pub fn size(&self) -> u32[src]

Get the current size of contract state.

pub fn truncate(&mut self, new_size: u32)[src]

Truncate the state to the given size. If the given size is more than the current state size this operation does nothing. The new position is at most at the end of the stream.

pub fn reserve(&mut self, len: u32) -> bool[src]

Make sure that the memory size is at least that many bytes in size. Returns true iff this was successful. The new bytes are initialized as 0.

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Implementors

impl HasContractState<()> for ContractState[src]

type ContractStateData = ()

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