aurora-evm 2.2.1

Aurora Ethereum Virtual Machine implementation written in pure Rust
Documentation 
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use primitive_types::{H160, U256};

/// Operations for recording external costs
pub enum ExternalOperation {
    /// Reading basic account from storage. Fixed size.
    AccountBasicRead,
    /// Reading address code from storage. Dynamic size.
    AddressCodeRead(H160),
    /// Basic check for account emptiness. Fixed size.
    IsEmpty,
    /// Writing to storage (Number of bytes written).
    Write(U256),
}