1.2.0[−][src]Struct std::fmt::DebugList
A struct to help with fmt::Debug
implementations.
This is useful when you wish to output a formatted list of items as a part
of your Debug::fmt
implementation.
This can be constructed by the
Formatter::debug_list
method.
Examples
use std::fmt; struct Foo(Vec<i32>); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { fmt.debug_list().entries(self.0.iter()).finish() } } assert_eq!( format!("{:?}", Foo(vec![10, 11])), "[10, 11]", );Run
Methods
impl<'a, 'b> DebugList<'a, 'b> where
'b: 'a,
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'b: 'a,
pub fn entry(&mut self, entry: &dyn Debug) -> &mut DebugList<'a, 'b>
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Adds a new entry to the list output.
Examples
use std::fmt; struct Foo(Vec<i32>, Vec<u32>); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_list() .entry(&self.0) // We add the first "entry". .entry(&self.1) // We add the second "entry". .finish() } } assert_eq!( format!("{:?}", Foo(vec![10, 11], vec![12, 13])), "[[10, 11], [12, 13]]", );Run
pub fn entries<D, I>(&mut self, entries: I) -> &mut DebugList<'a, 'b> where
D: Debug,
I: IntoIterator<Item = D>,
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D: Debug,
I: IntoIterator<Item = D>,
Adds the contents of an iterator of entries to the list output.
Examples
use std::fmt; struct Foo(Vec<i32>, Vec<u32>); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_list() .entries(self.0.iter()) .entries(self.1.iter()) .finish() } } assert_eq!( format!("{:?}", Foo(vec![10, 11], vec![12, 13])), "[10, 11, 12, 13]", );Run
pub fn finish(&mut self) -> Result<(), Error>
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Finishes output and returns any error encountered.
Examples
use std::fmt; struct Foo(Vec<i32>); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_list() .entries(self.0.iter()) .finish() // Ends the struct formatting. } } assert_eq!( format!("{:?}", Foo(vec![10, 11])), "[10, 11]", );Run
Auto Trait Implementations
Blanket Implementations
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
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ⓘImportant traits for &'_ mut F
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,