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// Copyright © 2023 Niklas Siemer
//
// This file is part of qFALL-math.
//
// qFALL-math is free software: you can redistribute it and/or modify it under
// the terms of the Mozilla Public License Version 2.0 as published by the
// Mozilla Foundation. See <https://mozilla.org/en-US/MPL/2.0/>.
//! This module contains implementations of functions
//! important for ownership such as the [`Clone`] and [`Drop`] trait.
//!
//! The explicit functions contain the documentation.
use crate::traits::MatrixDimensions;
use super::MatQ;
use flint_sys::fmpq_mat::{fmpq_mat_clear, fmpq_mat_set};
impl Clone for MatQ {
/// Clones the given element and returns a deep clone of the given [`MatQ`] element.
///
/// # Examples
/// ```
/// use qfall_math::rational::MatQ;
/// use std::str::FromStr;
///
/// let string = String::from("[[1/2, 2/3, 3/4],[3/1, 4/2, 5/4]]");
/// let a = MatQ::from_str(&string).unwrap();
/// let b = a.clone();
/// ```
fn clone(&self) -> Self {
let mut mat = MatQ::new(self.get_num_rows(), self.get_num_columns());
unsafe {
fmpq_mat_set(&mut mat.matrix, &self.matrix);
}
mat
}
}
impl Drop for MatQ {
/// Drops the given [`MatQ`] value and frees the allocated memory.
///
/// # Examples
/// ```
/// use qfall_math::rational::MatQ;
/// use std::str::FromStr;
///
/// let string = String::from("[[1/2, 2/3, 3/4],[3/1, 4/2, 5/4]]");
/// {
/// let a = MatQ::from_str(&string).unwrap();
/// } // as a's scope ends here, it get's dropped
/// ```
///
/// ```
/// use qfall_math::rational::MatQ;
/// use std::str::FromStr;
///
/// let string = String::from("[[1/2, 2/3, 3/4],[3/1, 4/2, 5/4]]");
/// let a = MatQ::from_str(&string).unwrap();
/// drop(a); // explicitly drops a's value
/// ```
fn drop(&mut self) {
unsafe { fmpq_mat_clear(&mut self.matrix) }
}
}
/// Test that the [`Clone`] trait is correctly implemented.
#[cfg(test)]
mod test_clone {
use super::MatQ;
use crate::{
rational::Q,
traits::{MatrixDimensions, MatrixGetEntry},
};
use std::str::FromStr;
/// check if a cloned value is still alive after the original value ran out of scope
#[test]
#[allow(clippy::redundant_clone)]
fn keep_alive() {
let a: MatQ;
let str_1 = "[[1/2, 2/3, 3/4],[3/1, 4/2, 5/4]]";
{
let b = MatQ::from_str(str_1).unwrap();
a = b.clone();
}
assert_eq!(a.get_num_rows(), 2);
assert_eq!(a.get_num_columns(), 3);
assert_eq!(a.get_entry(0, 0).unwrap(), Q::from((1, 2)));
assert_eq!(a.get_entry(0, 1).unwrap(), Q::from((2, 3)));
assert_eq!(a.get_entry(0, 2).unwrap(), Q::from((3, 4)));
assert_eq!(a.get_entry(1, 0).unwrap(), Q::from(3));
assert_eq!(a.get_entry(1, 1).unwrap(), Q::from((4, 2)));
assert_eq!(a.get_entry(1, 2).unwrap(), Q::from((5, 4)));
}
/// check whether the cloned large entries are stored separately
#[test]
fn entries_stored_separately() {
let a: MatQ;
let string = format!(
"[[{}/1, {}/2],[{}/3, {}/{}]]",
u64::MAX,
i64::MAX,
i64::MIN,
u64::MAX,
i64::MIN
);
let b = MatQ::from_str(&string).unwrap();
a = b.clone();
assert_ne!(
a.get_entry(0, 0).unwrap().value.num.0,
b.get_entry(0, 0).unwrap().value.num.0
);
assert_ne!(
a.get_entry(0, 1).unwrap().value.num.0,
b.get_entry(0, 1).unwrap().value.num.0
);
assert_ne!(
a.get_entry(1, 0).unwrap().value.num.0,
b.get_entry(1, 0).unwrap().value.num.0
);
assert_ne!(
a.get_entry(1, 1).unwrap().value.num.0,
b.get_entry(1, 1).unwrap().value.num.0
);
assert_ne!(
a.get_entry(1, 1).unwrap().value.den.0,
b.get_entry(1, 1).unwrap().value.den.0
);
assert_eq!(
a.get_entry(0, 1).unwrap().value.den.0,
b.get_entry(0, 1).unwrap().value.den.0
); // reduction applied, hence kept on stack
}
}
/// Test that the [`Drop`] trait is correctly implemented.
#[cfg(test)]
mod test_drop {
use super::MatQ;
use crate::traits::MatrixGetEntry;
use std::collections::HashSet;
use std::str::FromStr;
/// Creates a matrix with two large entries, drops it and outputs
/// the points these two entries were stored in
fn create_and_drop_matq() -> (i64, i64, i64, i64) {
let string = format!("[[{}/{}, {}/{}]]", u64::MAX, i64::MIN, i64::MAX, 1);
let a = MatQ::from_str(&string).unwrap();
let storage_num_0 = a.get_entry(0, 0).unwrap().value.num.0;
let storage_num_1 = a.get_entry(0, 1).unwrap().value.num.0;
let storage_den_0 = a.get_entry(0, 0).unwrap().value.den.0;
let storage_den_1 = a.get_entry(0, 1).unwrap().value.den.0;
(storage_num_0, storage_num_1, storage_den_0, storage_den_1)
}
/// Check whether freed memory is reused afterwards
#[test]
fn free_memory() {
let mut set = HashSet::new();
for _i in 0..5 {
set.insert(create_and_drop_matq());
}
assert!(set.len() < 5);
}
}