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Document From impls in path.rs #85710

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Jun 5, 2021
Merged

Document From impls in path.rs #85710

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24 changes: 24 additions & 0 deletions library/std/src/path.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1420,6 +1420,9 @@ impl Clone for PathBuf {

#[stable(feature = "box_from_path", since = "1.17.0")]
impl From<&Path> for Box<Path> {
/// Creates a boxed [`Path`] from a reference.
///
/// This will allocate and clone `path` to it.
fn from(path: &Path) -> Box<Path> {
let boxed: Box<OsStr> = path.inner.into();
let rw = Box::into_raw(boxed) as *mut Path;
Expand All @@ -1429,6 +1432,9 @@ impl From<&Path> for Box<Path> {

#[stable(feature = "box_from_cow", since = "1.45.0")]
impl From<Cow<'_, Path>> for Box<Path> {
/// Creates a boxed [`Path`] from a clone-on-write pointer.
///
/// Converting from a `Cow::Owned` does not clone or allocate.
#[inline]
fn from(cow: Cow<'_, Path>) -> Box<Path> {
match cow {
Expand Down Expand Up @@ -1471,6 +1477,9 @@ impl Clone for Box<Path> {

#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized + AsRef<OsStr>> From<&T> for PathBuf {
/// Converts a borrowed `OsStr` to a `PathBuf`.
///
/// Allocates a [`PathBuf`] and copies the data into it.
#[inline]
fn from(s: &T) -> PathBuf {
PathBuf::from(s.as_ref().to_os_string())
Expand Down Expand Up @@ -1575,6 +1584,10 @@ impl Default for PathBuf {

#[stable(feature = "cow_from_path", since = "1.6.0")]
impl<'a> From<&'a Path> for Cow<'a, Path> {
/// Creates a clone-on-write pointer from a reference to
/// [`Path`].
///
/// This conversion does not clone or allocate.
#[inline]
fn from(s: &'a Path) -> Cow<'a, Path> {
Cow::Borrowed(s)
Expand All @@ -1583,6 +1596,10 @@ impl<'a> From<&'a Path> for Cow<'a, Path> {

#[stable(feature = "cow_from_path", since = "1.6.0")]
impl<'a> From<PathBuf> for Cow<'a, Path> {
/// Creates a clone-on-write pointer from an owned
/// instance of [`PathBuf`].
///
/// This conversion does not clone or allocate.
#[inline]
fn from(s: PathBuf) -> Cow<'a, Path> {
Cow::Owned(s)
Expand All @@ -1591,6 +1608,10 @@ impl<'a> From<PathBuf> for Cow<'a, Path> {

#[stable(feature = "cow_from_pathbuf_ref", since = "1.28.0")]
impl<'a> From<&'a PathBuf> for Cow<'a, Path> {
/// Creates a clone-on-write pointer from a reference to
/// [`PathBuf`].
///
/// This conversion does not clone or allocate.
#[inline]
fn from(p: &'a PathBuf) -> Cow<'a, Path> {
Cow::Borrowed(p.as_path())
Expand All @@ -1599,6 +1620,9 @@ impl<'a> From<&'a PathBuf> for Cow<'a, Path> {

#[stable(feature = "pathbuf_from_cow_path", since = "1.28.0")]
impl<'a> From<Cow<'a, Path>> for PathBuf {
/// Converts a clone-on-write pointer to an owned path.
///
/// Converting from a `Cow::Owned` does not clone or allocate.
#[inline]
fn from(p: Cow<'a, Path>) -> Self {
p.into_owned()
Expand Down