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use super::engine_error;
use crate::specification::engines::AbstractEngine;
use crate::specification::entities::PlaintextVectorEntity;
engine_error! {
PlaintextVectorRetrievalError for PlaintextVectorRetrievalEngine @
}
/// A trait for engines retrieving arbitrary values from plaintext vectors.
///
/// # Semantics
///
/// This [pure](super#operation-semantics) operation generates a vec of arbitrary values from the
/// `input` plaintext vector. By arbitrary here, we mean that `Value` can be any type that suits the
/// backend implementor (an integer, a struct wrapping integers, a struct wrapping foreign data or
/// any other thing).
///
/// # Formal Definition
pub trait PlaintextVectorRetrievalEngine<PlaintextVector, Value>: AbstractEngine
where
PlaintextVector: PlaintextVectorEntity,
{
/// Retrieves arbitrary values from a plaintext vector.
fn retrieve_plaintext_vector(
&mut self,
plaintext: &PlaintextVector,
) -> Result<Vec<Value>, PlaintextVectorRetrievalError<Self::EngineError>>;
/// Unsafely retrieves arbitrary values from a plaintext vector.
///
/// # Safety
/// For the _general_ safety concerns regarding this operation, refer to the different variants
/// of [`PlaintextVectorRetrievalError`]. For safety concerns _specific_ to an engine, refer to
/// the implementer safety section.
unsafe fn retrieve_plaintext_vector_unchecked(
&mut self,
plaintext: &PlaintextVector,
) -> Vec<Value>;
}