zksync_bellman 0.32.10

zk-SNARK library, based on bellman
Documentation 
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/// Represents a variable in our constraint system.
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
pub struct Variable(pub(crate) Index);

impl Variable {
    /// This constructs a variable with an arbitrary index.
    /// Circuit implementations are not recommended to use this.
    pub fn new_unchecked(idx: Index) -> Variable {
        Variable(idx)
    }

    /// This returns the index underlying the variable.
    /// Circuit implementations are not recommended to use this.
    pub fn get_unchecked(&self) -> Index {
        self.0
    }
}

/// Represents the index of either an input variable or
/// auxillary variable.
#[derive(Copy, Clone, PartialEq, Debug, Hash, Eq, serde::Serialize, serde::Deserialize)]
pub enum Index {
    Input(usize),
    Aux(usize),
}