near-sdk 5.25.0

Rust library for writing NEAR smart contracts.
Documentation 
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use borsh::{BorshDeserialize, BorshSerialize};

use crate::env;

pub trait ContractState {
    #[inline]
    fn state_key() -> &'static [u8] {
        b"STATE"
    }

    #[inline]
    fn state_exists() -> bool {
        env::storage_has_key(Self::state_key())
    }

    #[inline]
    #[track_caller]
    fn state_read() -> Option<Self>
    where
        Self: BorshDeserialize,
    {
        env::storage_read(Self::state_key()).map(|data| {
            borsh::from_slice(&data)
                .unwrap_or_else(|_| env::panic_str("Cannot deserialize the contract state."))
        })
    }

    #[inline]
    #[track_caller]
    fn state_write(&self) -> bool
    where
        Self: BorshSerialize,
    {
        env::storage_write(
            Self::state_key(),
            &borsh::to_vec(self)
                .unwrap_or_else(|_| env::panic_str("Cannot serialize the contract state.")),
        )
    }
}