96 lines
3 KiB
Rust
96 lines
3 KiB
Rust
// Copyright 2013 The OMath Developers. For a full listing of the authors,
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// refer to the Cargo.toml file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::mem;
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use std::ptr;
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use std::ops::*;
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/// An array containing elements of type `Element`
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pub trait Array1 where
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Self: Index<usize, Output = <Self as Array1>::Element>,
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Self: IndexMut<usize, Output = <Self as Array1>::Element>,
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{
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type Element: Copy;
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/// Get the pointer to the first element of the array.
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fn ptr<'a>(&'a self) -> &'a Self::Element {
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&self[0]
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}
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/// Get a mutable pointer to the first element of the array.
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fn mut_ptr<'a>(&'a mut self) -> &'a mut Self::Element {
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&mut self[0]
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}
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/// Swap the elements at indices `i` and `j` in-place.
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#[inline]
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fn swap_elems(&mut self, i: usize, j: usize) {
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// Yeah, ok borrow checker – I know what I'm doing here
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unsafe { ptr::swap(&mut self[i], &mut self[j]) };
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}
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/// Replace an element in the array.
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#[inline]
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fn replace_elem(&mut self, i: usize, src: Self::Element) -> Self::Element {
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mem::replace(&mut self[i], src)
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}
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}
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/// A column-major array
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pub trait Array2 where
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Self: Index<usize, Output = <Self as Array2>::Column>,
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Self: IndexMut<usize, Output = <Self as Array2>::Column>,
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{
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type Element: Copy;
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type Column: Array1<Element = Self::Element>;
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type Row: Array1<Element = Self::Element>;
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/// Get the pointer to the first element of the array.
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fn ptr<'a>(&'a self) -> &'a Self::Element {
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&self[0][0]
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}
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/// Get a mutable pointer to the first element of the array.
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fn mut_ptr<'a>(&'a mut self) -> &'a mut Self::Element {
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&mut self[0][0]
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}
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/// Swap two columns of this array.
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#[inline]
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fn swap_cols(&mut self, a: usize, b: usize) {
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unsafe { ptr::swap(&mut self[a], &mut self[b]) };
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}
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/// Replace a column in the array.
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#[inline]
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fn replace_col(&mut self, c: usize, src: Self::Column) -> Self::Column {
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mem::replace(&mut self[c], src)
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}
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/// Get a row from this array by-value.
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fn row(&self, r: usize) -> Self::Row;
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/// Swap two rows of this array.
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fn swap_rows(&mut self, a: usize, b: usize);
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/// Swap the values at index `a` and `b`
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#[inline]
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fn swap_elems(&mut self, a: (usize, usize), b: (usize, usize)) {
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let (ac, ar) = a;
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let (bc, br) = b;
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unsafe { ptr::swap(&mut self[ac][ar], &mut self[bc][br]) };
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}
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}
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