antecedent-core 0.3.0

Identifiers, schemas, assumptions, provenance, and execution policy shared across the Antecedent causal inference engine; start with the `antecedent` crate
Documentation 
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//! Scalar and structured values used in queries and interventions.
//!
//! SPDX-License-Identifier: MIT OR Apache-2.0

use std::sync::Arc;

/// A concrete value assigned by an intervention or query contrast.
#[derive(Clone, Debug, PartialEq)]
pub enum Value {
    /// Floating-point scalar.
    Float64(f64),
    /// Integer scalar.
    Int64(i64),
    /// Boolean.
    Bool(bool),
    /// Category code (raw u32; domain lives in the schema).
    Category(u32),
    /// Opaque label for diagnostics only (not used in hot paths as a key).
    Label(Arc<str>),
}

impl Value {
    /// Convenience for a float64 value.
    #[must_use]
    pub const fn f64(v: f64) -> Self {
        Self::Float64(v)
    }

    /// Interpret as an `f64` level when possible.
    #[must_use]
    #[allow(clippy::cast_precision_loss)]
    pub fn as_f64(&self) -> Option<f64> {
        match self {
            Self::Float64(v) => Some(*v),
            Self::Int64(v) => Some(*v as f64),
            Self::Bool(v) => Some(f64::from(u8::from(*v))),
            Self::Category(v) => Some(f64::from(*v)),
            Self::Label(_) => None,
        }
    }
}

impl Eq for Value {}

impl core::hash::Hash for Value {
    fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
        core::mem::discriminant(self).hash(state);
        match self {
            Self::Float64(v) => v.to_bits().hash(state),
            Self::Int64(v) => v.hash(state),
            Self::Bool(v) => v.hash(state),
            Self::Category(v) => v.hash(state),
            Self::Label(v) => v.hash(state),
        }
    }
}