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// Copyright (C) 2020-2025 algebra-sparse authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// Trait for converting types to immutable views.
///
/// This trait provides a unified way to create efficient read-only views of various
/// sparse matrix and vector types without allocation. Views are useful for:
/// - Passing data to functions without transferring ownership
/// - Creating temporary references for computation
/// - Implementing generic algorithms that work with multiple matrix types
///
/// # Examples
///
/// ```rust
/// use algebra_sparse::{CsrMatrix, traits::IntoView};
/// use nalgebra::DMatrix;
///
/// let dense = DMatrix::from_row_slice(2, 2, &[1.0, 2.0, 3.0, 4.0]);
/// let csr = CsrMatrix::from_dense(dense.as_view());
///
/// // Create view for read-only operations
/// let view = csr.as_view(); // or csr.into_view()
/// println!("Shape: {:?}", view.shape());
/// ```