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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),
}