<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/Users/erlendbasso/.cargo/registry/src/github.com-1ecc6299db9ec823/nalgebra-0.32.1/src/base/vec_storage.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>vec_storage.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-1f7d512b176f0f72.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Bold-124a1ca42af929b6.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-6827029ac823cab7.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../../static.files/light-ebce58d0a40c3431.css"><link rel="stylesheet" disabled href="../../../static.files/dark-f23faae4a2daf9a6.css"><link rel="stylesheet" disabled href="../../../static.files/ayu-8af5e100b21cd173.css"><script id="default-settings" ></script><script src="../../../static.files/storage-d43fa987303ecbbb.js"></script><script defer src="../../../static.files/source-script-5cf2e01a42cc9858.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../static.files/main-c55e1eb52e1886b4.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="icon" href="https://nalgebra.org/img/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../nalgebra/index.html"><img class="rust-logo" src="../../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-5ec35bf9ca753509.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre><pre class="rust"><code><span class="attr">#[cfg(all(feature = <span class="string">"alloc"</span>, not(feature = <span class="string">"std"</span>)))]
</span><span class="kw">use </span>alloc::vec::Vec;
<span class="kw">use </span><span class="kw">crate</span>::base::allocator::Allocator;
<span class="kw">use </span><span class="kw">crate</span>::base::constraint::{SameNumberOfRows, ShapeConstraint};
<span class="kw">use </span><span class="kw">crate</span>::base::default_allocator::DefaultAllocator;
<span class="kw">use </span><span class="kw">crate</span>::base::dimension::{Dim, DimName, Dyn, U1};
<span class="kw">use </span><span class="kw">crate</span>::base::storage::{IsContiguous, Owned, RawStorage, RawStorageMut, ReshapableStorage};
<span class="kw">use </span><span class="kw">crate</span>::base::{Scalar, Vector};
<span class="attr">#[cfg(feature = <span class="string">"serde-serialize-no-std"</span>)]
</span><span class="kw">use </span>serde::{
de::{Deserialize, Deserializer, Error},
ser::{Serialize, Serializer},
};
<span class="kw">use </span><span class="kw">crate</span>::Storage;
<span class="kw">use </span>std::mem::MaybeUninit;
<span class="comment">/*
*
* RawStorage.
*
*/
</span><span class="doccomment">/// A Vec-based matrix data storage. It may be dynamically-sized.
</span><span class="attr">#[repr(C)]
#[derive(Eq, Debug, Clone, PartialEq)]
</span><span class="kw">pub struct </span>VecStorage<T, R: Dim, C: Dim> {
data: Vec<T>,
nrows: R,
ncols: C,
}
<span class="attr">#[cfg(feature = <span class="string">"serde-serialize"</span>)]
</span><span class="kw">impl</span><T, R: Dim, C: Dim> Serialize <span class="kw">for </span>VecStorage<T, R, C>
<span class="kw">where
</span>T: Serialize,
R: Serialize,
C: Serialize,
{
<span class="kw">fn </span>serialize<Ser>(<span class="kw-2">&</span><span class="self">self</span>, serializer: Ser) -> <span class="prelude-ty">Result</span><Ser::Ok, Ser::Error>
<span class="kw">where
</span>Ser: Serializer,
{
(<span class="kw-2">&</span><span class="self">self</span>.data, <span class="kw-2">&</span><span class="self">self</span>.nrows, <span class="kw-2">&</span><span class="self">self</span>.ncols).serialize(serializer)
}
}
<span class="attr">#[cfg(feature = <span class="string">"serde-serialize"</span>)]
</span><span class="kw">impl</span><<span class="lifetime">'a</span>, T, R: Dim, C: Dim> Deserialize<<span class="lifetime">'a</span>> <span class="kw">for </span>VecStorage<T, R, C>
<span class="kw">where
</span>T: Deserialize<<span class="lifetime">'a</span>>,
R: Deserialize<<span class="lifetime">'a</span>>,
C: Deserialize<<span class="lifetime">'a</span>>,
{
<span class="kw">fn </span>deserialize<Des>(deserializer: Des) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Des::Error>
<span class="kw">where
</span>Des: Deserializer<<span class="lifetime">'a</span>>,
{
<span class="kw">let </span>(data, nrows, ncols): (Vec<T>, R, C) = Deserialize::deserialize(deserializer)<span class="question-mark">?</span>;
<span class="comment">// SAFETY: make sure the data we deserialize have the
// correct number of elements.
</span><span class="kw">if </span>nrows.value() * ncols.value() != data.len() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Des::Error::custom(<span class="macro">format!</span>(
<span class="string">"Expected {} components, found {}"</span>,
nrows.value() * ncols.value(),
data.len()
)));
}
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ data, nrows, ncols })
}
}
<span class="attr">#[deprecated(note = <span class="string">"renamed to `VecStorage`"</span>)]
</span><span class="doccomment">/// Renamed to [`VecStorage`].
</span><span class="kw">pub type </span>MatrixVec<T, R, C> = VecStorage<T, R, C>;
<span class="kw">impl</span><T, R: Dim, C: Dim> VecStorage<T, R, C> {
<span class="doccomment">/// Creates a new dynamic matrix data storage from the given vector and shape.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>new(nrows: R, ncols: C, data: Vec<T>) -> <span class="self">Self </span>{
<span class="macro">assert!</span>(
nrows.value() * ncols.value() == data.len(),
<span class="string">"Data storage buffer dimension mismatch."
</span>);
<span class="self">Self </span>{ data, nrows, ncols }
}
<span class="doccomment">/// The underlying data storage.
</span><span class="attr">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>as_vec(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Vec<T> {
<span class="kw-2">&</span><span class="self">self</span>.data
}
<span class="doccomment">/// The underlying mutable data storage.
///
/// # Safety
/// This is unsafe because this may cause UB if the size of the vector is changed
/// by the user.
</span><span class="attr">#[inline]
</span><span class="kw">pub unsafe fn </span>as_vec_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Vec<T> {
<span class="kw-2">&mut </span><span class="self">self</span>.data
}
<span class="doccomment">/// Resizes the underlying mutable data storage and unwraps it.
///
/// # Safety
/// - If `sz` is larger than the current size, additional elements are uninitialized.
/// - If `sz` is smaller than the current size, additional elements are truncated but **not** dropped.
/// It is the responsibility of the caller of this method to drop these elements.
</span><span class="attr">#[inline]
</span><span class="kw">pub unsafe fn </span>resize(<span class="kw-2">mut </span><span class="self">self</span>, sz: usize) -> Vec<MaybeUninit<T>> {
<span class="kw">let </span>len = <span class="self">self</span>.len();
<span class="kw">let </span>new_data = <span class="kw">if </span>sz < len {
<span class="comment">// Use `set_len` instead of `truncate` because we don’t want to
// drop the removed elements (it’s the caller’s responsibility).
</span><span class="self">self</span>.data.set_len(sz);
<span class="self">self</span>.data.shrink_to_fit();
<span class="comment">// Safety:
// - MaybeUninit<T> has the same alignment and layout as T.
// - The length and capacity come from a valid vector.
</span>Vec::from_raw_parts(
<span class="self">self</span>.data.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>MaybeUninit<T>,
<span class="self">self</span>.data.len(),
<span class="self">self</span>.data.capacity(),
)
} <span class="kw">else </span>{
<span class="self">self</span>.data.reserve_exact(sz - len);
<span class="comment">// Safety:
// - MaybeUninit<T> has the same alignment and layout as T.
// - The length and capacity come from a valid vector.
</span><span class="kw">let </span><span class="kw-2">mut </span>new_data = Vec::from_raw_parts(
<span class="self">self</span>.data.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>MaybeUninit<T>,
<span class="self">self</span>.data.len(),
<span class="self">self</span>.data.capacity(),
);
<span class="comment">// Safety: we can set the length here because MaybeUninit is always assumed
// to be initialized.
</span>new_data.set_len(sz);
new_data
};
<span class="comment">// Avoid double-free by forgetting `self` because its data buffer has
// been transfered to `new_data`.
</span>std::mem::forget(<span class="self">self</span>);
new_data
}
<span class="doccomment">/// The number of elements on the underlying vector.
</span><span class="attr">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<span class="self">self</span>.data.len()
}
<span class="doccomment">/// Returns true if the underlying vector contains no elements.
</span><span class="attr">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<span class="self">self</span>.len() == <span class="number">0
</span>}
<span class="doccomment">/// A slice containing all the components stored in this storage in column-major order.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] {
<span class="kw-2">&</span><span class="self">self</span>.data[..]
}
<span class="doccomment">/// A mutable slice containing all the components stored in this storage in column-major order.
</span><span class="attr">#[inline]
</span><span class="kw">pub fn </span>as_mut_slice(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] {
<span class="kw-2">&mut </span><span class="self">self</span>.data[..]
}
}
<span class="kw">impl</span><T, R: Dim, C: Dim> From<VecStorage<T, R, C>> <span class="kw">for </span>Vec<T> {
<span class="kw">fn </span>from(vec: VecStorage<T, R, C>) -> <span class="self">Self </span>{
vec.data
}
}
<span class="comment">/*
*
* Dyn − Static
* Dyn − Dyn
*
*/
</span><span class="kw">unsafe impl</span><T, C: Dim> RawStorage<T, Dyn, C> <span class="kw">for </span>VecStorage<T, Dyn, C> {
<span class="kw">type </span>RStride = U1;
<span class="kw">type </span>CStride = Dyn;
<span class="attr">#[inline]
</span><span class="kw">fn </span>ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*const </span>T {
<span class="self">self</span>.data.as_ptr()
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>shape(<span class="kw-2">&</span><span class="self">self</span>) -> (Dyn, C) {
(<span class="self">self</span>.nrows, <span class="self">self</span>.ncols)
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>strides(<span class="kw-2">&</span><span class="self">self</span>) -> (<span class="self">Self</span>::RStride, <span class="self">Self</span>::CStride) {
(<span class="self">Self</span>::RStride::name(), <span class="self">self</span>.nrows)
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>is_contiguous(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<span class="bool-val">true
</span>}
<span class="attr">#[inline]
</span><span class="kw">unsafe fn </span>as_slice_unchecked(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] {
<span class="kw-2">&</span><span class="self">self</span>.data
}
}
<span class="kw">unsafe impl</span><T: Scalar, C: Dim> Storage<T, Dyn, C> <span class="kw">for </span>VecStorage<T, Dyn, C>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, Dyn, C, Buffer = <span class="self">Self</span>>,
{
<span class="attr">#[inline]
</span><span class="kw">fn </span>into_owned(<span class="self">self</span>) -> Owned<T, Dyn, C>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, Dyn, C>,
{
<span class="self">self
</span>}
<span class="attr">#[inline]
</span><span class="kw">fn </span>clone_owned(<span class="kw-2">&</span><span class="self">self</span>) -> Owned<T, Dyn, C>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, Dyn, C>,
{
<span class="self">self</span>.clone()
}
}
<span class="kw">unsafe impl</span><T, R: DimName> RawStorage<T, R, Dyn> <span class="kw">for </span>VecStorage<T, R, Dyn> {
<span class="kw">type </span>RStride = U1;
<span class="kw">type </span>CStride = R;
<span class="attr">#[inline]
</span><span class="kw">fn </span>ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*const </span>T {
<span class="self">self</span>.data.as_ptr()
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>shape(<span class="kw-2">&</span><span class="self">self</span>) -> (R, Dyn) {
(<span class="self">self</span>.nrows, <span class="self">self</span>.ncols)
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>strides(<span class="kw-2">&</span><span class="self">self</span>) -> (<span class="self">Self</span>::RStride, <span class="self">Self</span>::CStride) {
(<span class="self">Self</span>::RStride::name(), <span class="self">self</span>.nrows)
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>is_contiguous(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<span class="bool-val">true
</span>}
<span class="attr">#[inline]
</span><span class="kw">unsafe fn </span>as_slice_unchecked(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] {
<span class="kw-2">&</span><span class="self">self</span>.data
}
}
<span class="kw">unsafe impl</span><T: Scalar, R: DimName> Storage<T, R, Dyn> <span class="kw">for </span>VecStorage<T, R, Dyn>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, R, Dyn, Buffer = <span class="self">Self</span>>,
{
<span class="attr">#[inline]
</span><span class="kw">fn </span>into_owned(<span class="self">self</span>) -> Owned<T, R, Dyn>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, R, Dyn>,
{
<span class="self">self
</span>}
<span class="attr">#[inline]
</span><span class="kw">fn </span>clone_owned(<span class="kw-2">&</span><span class="self">self</span>) -> Owned<T, R, Dyn>
<span class="kw">where
</span>DefaultAllocator: Allocator<T, R, Dyn>,
{
<span class="self">self</span>.clone()
}
}
<span class="comment">/*
*
* RawStorageMut, ContiguousStorage.
*
*/
</span><span class="kw">unsafe impl</span><T, C: Dim> RawStorageMut<T, Dyn, C> <span class="kw">for </span>VecStorage<T, Dyn, C> {
<span class="attr">#[inline]
</span><span class="kw">fn </span>ptr_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">*mut </span>T {
<span class="self">self</span>.data.as_mut_ptr()
}
<span class="attr">#[inline]
</span><span class="kw">unsafe fn </span>as_mut_slice_unchecked(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] {
<span class="kw-2">&mut </span><span class="self">self</span>.data[..]
}
}
<span class="kw">unsafe impl</span><T, R: Dim, C: Dim> IsContiguous <span class="kw">for </span>VecStorage<T, R, C> {}
<span class="kw">impl</span><T, C1, C2> ReshapableStorage<T, Dyn, C1, Dyn, C2> <span class="kw">for </span>VecStorage<T, Dyn, C1>
<span class="kw">where
</span>T: Scalar,
C1: Dim,
C2: Dim,
{
<span class="kw">type </span>Output = VecStorage<T, Dyn, C2>;
<span class="kw">fn </span>reshape_generic(<span class="self">self</span>, nrows: Dyn, ncols: C2) -> <span class="self">Self</span>::Output {
<span class="macro">assert_eq!</span>(nrows.value() * ncols.value(), <span class="self">self</span>.data.len());
VecStorage {
data: <span class="self">self</span>.data,
nrows,
ncols,
}
}
}
<span class="kw">impl</span><T, C1, R2> ReshapableStorage<T, Dyn, C1, R2, Dyn> <span class="kw">for </span>VecStorage<T, Dyn, C1>
<span class="kw">where
</span>T: Scalar,
C1: Dim,
R2: DimName,
{
<span class="kw">type </span>Output = VecStorage<T, R2, Dyn>;
<span class="kw">fn </span>reshape_generic(<span class="self">self</span>, nrows: R2, ncols: Dyn) -> <span class="self">Self</span>::Output {
<span class="macro">assert_eq!</span>(nrows.value() * ncols.value(), <span class="self">self</span>.data.len());
VecStorage {
data: <span class="self">self</span>.data,
nrows,
ncols,
}
}
}
<span class="kw">unsafe impl</span><T, R: DimName> RawStorageMut<T, R, Dyn> <span class="kw">for </span>VecStorage<T, R, Dyn> {
<span class="attr">#[inline]
</span><span class="kw">fn </span>ptr_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">*mut </span>T {
<span class="self">self</span>.data.as_mut_ptr()
}
<span class="attr">#[inline]
</span><span class="kw">unsafe fn </span>as_mut_slice_unchecked(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] {
<span class="kw-2">&mut </span><span class="self">self</span>.data[..]
}
}
<span class="kw">impl</span><T, R1, C2> ReshapableStorage<T, R1, Dyn, Dyn, C2> <span class="kw">for </span>VecStorage<T, R1, Dyn>
<span class="kw">where
</span>T: Scalar,
R1: DimName,
C2: Dim,
{
<span class="kw">type </span>Output = VecStorage<T, Dyn, C2>;
<span class="kw">fn </span>reshape_generic(<span class="self">self</span>, nrows: Dyn, ncols: C2) -> <span class="self">Self</span>::Output {
<span class="macro">assert_eq!</span>(nrows.value() * ncols.value(), <span class="self">self</span>.data.len());
VecStorage {
data: <span class="self">self</span>.data,
nrows,
ncols,
}
}
}
<span class="kw">impl</span><T, R1, R2> ReshapableStorage<T, R1, Dyn, R2, Dyn> <span class="kw">for </span>VecStorage<T, R1, Dyn>
<span class="kw">where
</span>T: Scalar,
R1: DimName,
R2: DimName,
{
<span class="kw">type </span>Output = VecStorage<T, R2, Dyn>;
<span class="kw">fn </span>reshape_generic(<span class="self">self</span>, nrows: R2, ncols: Dyn) -> <span class="self">Self</span>::Output {
<span class="macro">assert_eq!</span>(nrows.value() * ncols.value(), <span class="self">self</span>.data.len());
VecStorage {
data: <span class="self">self</span>.data,
nrows,
ncols,
}
}
}
<span class="kw">impl</span><T, R: Dim> Extend<T> <span class="kw">for </span>VecStorage<T, R, Dyn> {
<span class="doccomment">/// Extends the number of columns of the `VecStorage` with elements
/// from the given iterator.
///
/// # Panics
/// This function panics if the number of elements yielded by the
/// given iterator is not a multiple of the number of rows of the
/// `VecStorage`.
</span><span class="kw">fn </span>extend<I: IntoIterator<Item = T>>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) {
<span class="self">self</span>.data.extend(iter);
<span class="self">self</span>.ncols = Dyn(<span class="self">self</span>.data.len() / <span class="self">self</span>.nrows.value());
<span class="macro">assert!</span>(<span class="self">self</span>.data.len() % <span class="self">self</span>.nrows.value() == <span class="number">0</span>,
<span class="string">"The number of elements produced by the given iterator was not a multiple of the number of rows."</span>);
}
}
<span class="kw">impl</span><<span class="lifetime">'a</span>, T: <span class="lifetime">'a </span>+ Copy, R: Dim> Extend<<span class="kw-2">&</span><span class="lifetime">'a </span>T> <span class="kw">for </span>VecStorage<T, R, Dyn> {
<span class="doccomment">/// Extends the number of columns of the `VecStorage` with elements
/// from the given iterator.
///
/// # Panics
/// This function panics if the number of elements yielded by the
/// given iterator is not a multiple of the number of rows of the
/// `VecStorage`.
</span><span class="kw">fn </span>extend<I: IntoIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T>>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) {
<span class="self">self</span>.extend(iter.into_iter().copied())
}
}
<span class="kw">impl</span><T, R, RV, SV> Extend<Vector<T, RV, SV>> <span class="kw">for </span>VecStorage<T, R, Dyn>
<span class="kw">where
</span>T: Scalar,
R: Dim,
RV: Dim,
SV: RawStorage<T, RV>,
ShapeConstraint: SameNumberOfRows<R, RV>,
{
<span class="doccomment">/// Extends the number of columns of the `VecStorage` with vectors
/// from the given iterator.
///
/// # Panics
/// This function panics if the number of rows of each `Vector`
/// yielded by the iterator is not equal to the number of rows
/// of this `VecStorage`.
</span><span class="kw">fn </span>extend<I: IntoIterator<Item = Vector<T, RV, SV>>>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) {
<span class="kw">let </span>nrows = <span class="self">self</span>.nrows.value();
<span class="kw">let </span>iter = iter.into_iter();
<span class="kw">let </span>(lower, _upper) = iter.size_hint();
<span class="self">self</span>.data.reserve(nrows * lower);
<span class="kw">for </span>vector <span class="kw">in </span>iter {
<span class="macro">assert_eq!</span>(nrows, vector.shape().<span class="number">0</span>);
<span class="self">self</span>.data.extend(vector.iter().cloned());
}
<span class="self">self</span>.ncols = Dyn(<span class="self">self</span>.data.len() / nrows);
}
}
<span class="kw">impl</span><T> Extend<T> <span class="kw">for </span>VecStorage<T, Dyn, U1> {
<span class="doccomment">/// Extends the number of rows of the `VecStorage` with elements
/// from the given iterator.
</span><span class="kw">fn </span>extend<I: IntoIterator<Item = T>>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) {
<span class="self">self</span>.data.extend(iter);
<span class="self">self</span>.nrows = Dyn(<span class="self">self</span>.data.len());
}
}
</code></pre></div>
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