/////////////////////////////////////////////////////////////////////////////////////////////
//
// Declares the kernel evaluation trait used by BBFMM for black-box kernel functions.
//
// Created on: 15 Nov 2025 Author: Daniel Owen
//
// Copyright (c) 2025, Maptek Pty Ltd. All rights reserved. Licensed under the MIT License.
//
/////////////////////////////////////////////////////////////////////////////////////////////
use RowRef;
/// Evaluates a kernel function between a target and source point.
///
/// Implementors define how the kernel is computed given two
/// [`faer::RowRef<f64>`](https://docs.rs/faer/latest/faer/row/type.RowRef.html)
/// arguments representing the target and source locations. This interface
/// supports 1D–3D inputs without requiring separate traits.