# 1.2.0[−][src]Struct core::fmt::DebugSet

    #[must_use = "must eventually call `finish()` on Debug builders"]
    pub struct DebugSet<'a, 'b: 'a> { /* fields omitted */ }

A struct to help with `fmt::Debug` implementations.

This is useful when you wish to output a formatted set of items as a part of your `Debug::fmt` implementation.

This can be constructed by the `Formatter::debug_set` 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_set().entries(self.0.iter()).finish()
        }
    }

    // prints "{10, 11}"
    println!("{:?}", Foo(vec![10, 11]));Run

## Methods

###

`impl<'a, 'b: 'a> DebugSet<'a, 'b>`

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`pub fn entry(&mut self, entry: &dyn Debug) -> &mut DebugSet<'a, 'b>`

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Adds a new entry to the set output.

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`pub fn entries<D, I>(&mut self, entries: I) -> &mut DebugSet<'a, 'b> where D: Debug, I: IntoIterator<Item = D>,`

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Adds the contents of an iterator of entries to the set output.

####

`pub fn finish(&mut self) -> Result`

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Finishes output and returns any error encountered.

## Auto Trait Implementations

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`impl<'a, 'b> !Send for DebugSet<'a, 'b>`

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`impl<'a, 'b> !Sync for DebugSet<'a, 'b>`

## Blanket Implementations

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(Self) -> U`

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Performs the conversion.

###

`impl<T> From for T`

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`fn from(T) -> T`

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Performs the conversion.

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`impl<T, U> TryInto for T where U: TryFrom<T>,`

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#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

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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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

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#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

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`fn borrow(&Self) -> &T`

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Immutably borrows from an owned value. Read more

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`impl<T> BorrowMut for T where T: ?Sized,`

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`fn borrow_mut(&mut Self) -> &mut T`

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Mutably borrows from an owned value. Read more

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`impl<T> Any for T where T: 'static + ?Sized,`

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`fn get_type_id(&Self) -> TypeId`

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🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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