Skip to content

Document default values for primitive types #43252

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Jul 16, 2017
Merged

Document default values for primitive types #43252

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
db19bf0
Document default values for primitive types
vbrandl Jul 15, 2017
caf125f
Rephrase the doc string
vbrandl Jul 15, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
37 changes: 19 additions & 18 deletions src/libcore/default.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -126,32 +126,33 @@ pub trait Default: Sized {
}

macro_rules! default_impl {
($t:ty, $v:expr) => {
($t:ty, $v:expr, $doc:expr) => {
#[stable(feature = "rust1", since = "1.0.0")]
impl Default for $t {
#[inline]
#[doc = $doc]
fn default() -> $t { $v }
}
}
}

default_impl! { (), () }
default_impl! { bool, false }
default_impl! { char, '\x00' }
default_impl! { (), (), "Returns the default value of `()`" }
default_impl! { bool, false, "Returns the default value of `false`" }
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Shouldn't it be "Returns the default value ofbool which is false?"

default_impl! { char, '\x00', "Returns the default value of `\\x00`" }
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Shouldn't it be "Returns the default value of char which is \\x00?"


default_impl! { usize, 0 }
default_impl! { u8, 0 }
default_impl! { u16, 0 }
default_impl! { u32, 0 }
default_impl! { u64, 0 }
default_impl! { u128, 0 }
default_impl! { usize, 0, "Returns the default value of `0`" }
default_impl! { u8, 0, "Returns the default value of `0`" }
default_impl! { u16, 0, "Returns the default value of `0`" }
default_impl! { u32, 0, "Returns the default value of `0`" }
default_impl! { u64, 0, "Returns the default value of `0`" }
default_impl! { u128, 0, "Returns the default value of `0`" }

default_impl! { isize, 0 }
default_impl! { i8, 0 }
default_impl! { i16, 0 }
default_impl! { i32, 0 }
default_impl! { i64, 0 }
default_impl! { i128, 0 }
default_impl! { isize, 0, "Returns the default value of `0`" }
default_impl! { i8, 0, "Returns the default value of `0`" }
default_impl! { i16, 0, "Returns the default value of `0`" }
default_impl! { i32, 0, "Returns the default value of `0`" }
default_impl! { i64, 0, "Returns the default value of `0`" }
default_impl! { i128, 0, "Returns the default value of `0`" }

default_impl! { f32, 0.0f32 }
default_impl! { f64, 0.0f64 }
default_impl! { f32, 0.0f32, "Returns the default value of `0.0`" }
default_impl! { f64, 0.0f64, "Returns the default value of `0.0`" }