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Implement fmt::Pointer for pointers to unsized types

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This allows printing pointers to unsized types with the {:p} formatting
directive. The following impls are extended to unsized types:
 - impl<'a, T: ?Sized> Pointer for &'a T
 - impl<'a, T: ?Sized> Pointer for &'a mut T
 - impl<T: ?Sized> Pointer for *const T
 - impl<T: ?Sized> Pointer for *mut T
 - impl<T: ?Sized> fmt::Pointer for Box<T>
 - impl<T: ?Sized> fmt::Pointer for Rc<T>
 - impl<T: ?Sized> fmt::Pointer for Arc<T>
This commit is contained in:
Kamal Marhubi
2016-02-07 17:57:01 -05:00
parent 26105b1a37
commit c5f73ed80c
5 changed files with 16 additions and 8 deletions
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10
src/libcore/fmt/mod.rs
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@@ -1384,7 +1384,7 @@ impl Display for char {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T> Pointer for *const T {
impl<T: ?Sized> Pointer for *const T {
fn fmt(&self, f: &mut Formatter) -> Result {
let old_width = f.width;
let old_flags = f.flags;
@@ -1402,7 +1402,7 @@ impl<T> Pointer for *const T {
}
f.flags |= 1 << (FlagV1::Alternate as u32);
let ret = LowerHex::fmt(&(*self as usize), f);
let ret = LowerHex::fmt(&(*self as *const () as usize), f);
f.width = old_width;
f.flags = old_flags;
@@ -1412,7 +1412,7 @@ impl<T> Pointer for *const T {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T> Pointer for *mut T {
impl<T: ?Sized> Pointer for *mut T {
fn fmt(&self, f: &mut Formatter) -> Result {
// FIXME(#23542) Replace with type ascription.
#![allow(trivial_casts)]
@@ -1421,7 +1421,7 @@ impl<T> Pointer for *mut T {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, T> Pointer for &'a T {
impl<'a, T: ?Sized> Pointer for &'a T {
fn fmt(&self, f: &mut Formatter) -> Result {
// FIXME(#23542) Replace with type ascription.
#![allow(trivial_casts)]
@@ -1430,7 +1430,7 @@ impl<'a, T> Pointer for &'a T {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, T> Pointer for &'a mut T {
impl<'a, T: ?Sized> Pointer for &'a mut T {
fn fmt(&self, f: &mut Formatter) -> Result {
// FIXME(#23542) Replace with type ascription.
#![allow(trivial_casts)]