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use crate::Matrix;
use crate::error::Result;
use crate::index::Index;
use crate::order::Order;
use crate::shape::{AxisShape, Shape};
use alloc::vec;
use alloc::vec::Vec;
impl<T> Matrix<T> {
/// Creates a new, empty [`Matrix<T>`].
///
/// # Examples
///
/// ```
/// use matreex::Matrix;
///
/// let matrix = Matrix::<i32>::new();
/// assert_eq!(matrix.nrows(), 0);
/// assert_eq!(matrix.ncols(), 0);
/// assert!(matrix.is_empty());
/// ```
#[inline]
pub fn new() -> Self {
let order = Order::default();
let shape = AxisShape::default();
let data = Vec::new();
Self { order, shape, data }
}
/// Creates a new, empty [`Matrix<T>`] with at least the specified
/// capacity.
///
/// # Examples
///
/// ```
/// use matreex::Matrix;
///
/// let matrix = Matrix::<i32>::with_capacity(10);
/// assert_eq!(matrix.nrows(), 0);
/// assert_eq!(matrix.ncols(), 0);
/// assert!(matrix.is_empty());
/// assert!(matrix.capacity() >= 10);
/// ```
#[inline]
pub fn with_capacity(capacity: usize) -> Self {
let order = Order::default();
let shape = AxisShape::default();
let data = Vec::with_capacity(capacity);
Self { order, shape, data }
}
/// Creates a new [`Matrix<T>`] with the specified shape, filled with
/// the default value.
///
/// # Errors
///
/// - [`Error::SizeOverflow`] if size exceeds [`usize::MAX`].
/// - [`Error::CapacityOverflow`] if required capacity in bytes exceeds [`isize::MAX`].
///
/// # Examples
///
/// ```
/// use matreex::{Matrix, matrix};
///
/// let result = Matrix::with_default((2, 3));
/// assert_eq!(result, Ok(matrix![[0, 0, 0], [0, 0, 0]]));
/// ```
///
/// [`Error::SizeOverflow`]: crate::error::Error::SizeOverflow
/// [`Error::CapacityOverflow`]: crate::error::Error::CapacityOverflow
pub fn with_default<S>(shape: S) -> Result<Self>
where
T: Default,
S: Into<Shape>,
{
let order = Order::default();
let shape = AxisShape::from_shape(shape.into(), order);
let size = shape.size::<T>()?;
let mut data = Vec::with_capacity(size);
data.resize_with(size, T::default);
Ok(Self { order, shape, data })
}
/// Creates a new [`Matrix<T>`] with the specified shape, filled with
/// the given value.
///
/// # Errors
///
/// - [`Error::SizeOverflow`] if size exceeds [`usize::MAX`].
/// - [`Error::CapacityOverflow`] if required capacity in bytes exceeds [`isize::MAX`].
///
/// # Examples
///
/// ```
/// use matreex::{Matrix, matrix};
///
/// let result = Matrix::with_value((2, 3), 0);
/// assert_eq!(result, Ok(matrix![[0, 0, 0], [0, 0, 0]]));
/// ```
///
/// [`Error::SizeOverflow`]: crate::error::Error::SizeOverflow
/// [`Error::CapacityOverflow`]: crate::error::Error::CapacityOverflow
pub fn with_value<S>(shape: S, value: T) -> Result<Self>
where
T: Clone,
S: Into<Shape>,
{
let order = Order::default();
let shape = AxisShape::from_shape(shape.into(), order);
let size = shape.size::<T>()?;
let data = vec![value; size];
Ok(Self { order, shape, data })
}
/// Creates a new [`Matrix<T>`] with the specified shape, where each
/// element is initialized using its index.
///
/// # Errors
///
/// - [`Error::SizeOverflow`] if size exceeds [`usize::MAX`].
/// - [`Error::CapacityOverflow`] if required capacity in bytes exceeds [`isize::MAX`].
///
/// # Examples
///
/// ```
/// use matreex::{Matrix, matrix};
///
/// let result = Matrix::with_initializer((2, 3), |index| index.row + index.col);
/// assert_eq!(result, Ok(matrix![[0, 1, 2], [1, 2, 3]]));
/// ```
///
/// [`Error::SizeOverflow`]: crate::error::Error::SizeOverflow
/// [`Error::CapacityOverflow`]: crate::error::Error::CapacityOverflow
pub fn with_initializer<S, F>(shape: S, mut initializer: F) -> Result<Self>
where
S: Into<Shape>,
F: FnMut(Index) -> T,
{
let order = Order::default();
let shape = AxisShape::from_shape(shape.into(), order);
let size = shape.size::<T>()?;
let mut data = Vec::with_capacity(size);
for index in 0..size {
let index = Index::from_flattened(index, order, shape);
let element = initializer(index);
data.push(element);
}
Ok(Self { order, shape, data })
}
}
impl<T> Default for Matrix<T> {
#[inline]
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::error::Error;
use crate::matrix;
use crate::testkit;
#[test]
fn test_new() {
let matrix = Matrix::<i32>::new();
assert_eq!(matrix.order, Order::default());
assert_eq!(matrix.nrows(), 0);
assert_eq!(matrix.ncols(), 0);
assert!(matrix.is_empty());
}
#[test]
fn test_with_capacity() {
let matrix = Matrix::<i32>::with_capacity(10);
assert_eq!(matrix.order, Order::default());
assert_eq!(matrix.nrows(), 0);
assert_eq!(matrix.ncols(), 0);
assert!(matrix.is_empty());
assert!(matrix.capacity() >= 10);
}
#[test]
fn test_with_default() {
let shape = Shape::new(2, 3);
let matrix = Matrix::<i32>::with_default(shape).unwrap();
assert_eq!(matrix.order, Order::default());
let expected = matrix![[0, 0, 0], [0, 0, 0]];
testkit::assert_loose_eq(&matrix, &expected);
let shape = Shape::new(usize::MAX, 2);
let error = Matrix::<i32>::with_default(shape).unwrap_err();
assert_eq!(error, Error::SizeOverflow);
let shape = Shape::new(isize::MAX as usize / 4 + 1, 1);
let error = Matrix::<i32>::with_default(shape).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
let shape = Shape::new(isize::MAX as usize + 1, 1);
let error = Matrix::<u8>::with_default(shape).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
// unable to cover
// let shape = Shape::new(isize::MAX as usize + 1, 1);
// assert!(Matrix::<()>::with_default(shape).is_ok());
}
#[test]
fn test_with_value() {
let shape = Shape::new(2, 3);
let matrix = Matrix::with_value(shape, 0).unwrap();
assert_eq!(matrix.order, Order::default());
let expected = matrix![[0, 0, 0], [0, 0, 0]];
testkit::assert_loose_eq(&matrix, &expected);
let shape = Shape::new(usize::MAX, 2);
let error = Matrix::with_value(shape, 0).unwrap_err();
assert_eq!(error, Error::SizeOverflow);
let shape = Shape::new(isize::MAX as usize / 4 + 1, 1);
let error = Matrix::<i32>::with_value(shape, 0).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
let shape = Shape::new(isize::MAX as usize + 1, 1);
let error = Matrix::<u8>::with_value(shape, 0).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
let shape = Shape::new(isize::MAX as usize + 1, 1);
assert!(Matrix::<()>::with_value(shape, ()).is_ok());
}
#[test]
fn test_with_initializer() {
let shape = Shape::new(2, 3);
let matrix = Matrix::with_initializer(shape, |index| index.row + index.col).unwrap();
assert_eq!(matrix.order, Order::default());
let expected = matrix![[0, 1, 2], [1, 2, 3]];
testkit::assert_loose_eq(&matrix, &expected);
let shape = Shape::new(usize::MAX, 2);
let error = Matrix::with_initializer(shape, |_| 0).unwrap_err();
assert_eq!(error, Error::SizeOverflow);
let shape = Shape::new(isize::MAX as usize / 4 + 1, 1);
let error = Matrix::<i32>::with_initializer(shape, |_| 0).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
let shape = Shape::new(isize::MAX as usize + 1, 1);
let error = Matrix::<u8>::with_initializer(shape, |_| 0).unwrap_err();
assert_eq!(error, Error::CapacityOverflow);
// unable to cover
// let shape = Shape::new(isize::MAX as usize + 1, 1);
// assert!(Matrix::<()>::with_initializer(shape, |_| ()).is_ok());
}
}