# Struct alloc::fmt::DebugTuple 1.2.0 [−] [src]

    #[must_use]
    pub struct DebugTuple<'a, 'b> where
        'b: 'a,  { /* fields omitted */ }

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()
        }
    }

    // prints "Foo(10, "Hello World")"
    println!("{:?}", Foo(10, "Hello World".to_string()));

## Methods

### `impl<'a, 'b> DebugTuple<'a, 'b> where
'b: 'a,`
[src]

#### `fn field(&mut self, value: &Debug) -> &mut DebugTuple<'a, 'b>`
[src]

Adds a new field to the generated tuple struct output.

#### `fn finish(&mut self) -> Result<(), Error>`
[src]

Finishes output and returns any error encountered.

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