1.2.0[−][src]Struct alloc::fmt::DebugTuple
A struct to help with fmt::Debug
implementations.
This is useful when you wish to output a formatted tuple as a part of your
Debug::fmt
implementation.
This can be constructed by the
Formatter::debug_tuple
method.
Examples
use std::fmt; struct Foo(i32, String); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { fmt.debug_tuple("Foo") .field(&self.0) .field(&self.1) .finish() } } assert_eq!( format!("{:?}", Foo(10, "Hello World".to_string())), "Foo(10, \"Hello World\")", );
Methods
impl<'a, 'b> DebugTuple<'a, 'b> where
'b: 'a,
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'b: 'a,
pub fn field(&mut self, value: &dyn Debug) -> &mut DebugTuple<'a, 'b>
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Adds a new field to the generated tuple struct output.
Examples
use std::fmt; struct Foo(i32, String); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_tuple("Foo") .field(&self.0) // We add the first field. .field(&self.1) // We add the second field. .finish() // We're good to go! } } assert_eq!( format!("{:?}", Foo(10, "Hello World".to_string())), "Foo(10, \"Hello World\")", );
pub fn finish(&mut self) -> Result<(), Error>
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Finishes output and returns any error encountered.
Examples
use std::fmt; struct Foo(i32, String); impl fmt::Debug for Foo { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_tuple("Foo") .field(&self.0) .field(&self.1) .finish() // You need to call it to "finish" the // tuple formatting. } } assert_eq!( format!("{:?}", Foo(10, "Hello World".to_string())), "Foo(10, \"Hello World\")", );
Auto Trait Implementations
impl<'a, 'b> Unpin for DebugTuple<'a, 'b> where
'b: 'a,
'b: 'a,
impl<'a, 'b> !Send for DebugTuple<'a, 'b>
impl<'a, 'b> !Sync for DebugTuple<'a, 'b>
Blanket Implementations
impl<T> From<T> for T
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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, 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,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,