// SPDX-License-Identifier: Apache-2.0

// SPDX-FileCopyrightText: Copyright the Vortex contributors

//! Scalar function vtable machinery.

//!

//! This module contains the [`ScalarFnVTable`] trait and all built-in scalar function

//! implementations. Expressions ([`crate::expr::Expression`]) reference scalar functions

//! at each node.

use vortex_session::registry::Id;

mod vtable;

pub use vtable::*;

mod plugin;

pub use plugin::*;

mod foreign;

pub use foreign::*;

mod typed;

pub use typed::*;

mod erased;

pub use erased::*;

mod options;

pub use options::*;

mod signature;

pub use signature::*;

pub mod fns;

pub mod session;

/// A unique identifier for a scalar function.

pub type ScalarFnId = Id;

/// Private module to seal [`typed::DynScalarFn`].

mod sealed {

use crate::scalar_fn::ScalarFnVTable;

use crate::scalar_fn::typed::ScalarFn;

/// Marker trait to prevent external implementations of [`super::typed::DynScalarFn`].

pub(crate) trait Sealed {}

/// This can be the **only** implementor for [`super::typed::DynScalarFn`].

impl<V: ScalarFnVTable> Sealed for ScalarFn<V> {}

}