# [−][src]Trait num_traits::identities::Zero

    pub trait Zero: Sized + Add<Self, Output = Self> {
        fn zero() -> Self;
        fn is_zero(&self) -> bool;

        fn set_zero(&mut self) { ... }
    }

Defines an additive identity element for `Self`.

# Laws

    a + 0 = a       ∀ a ∈ Self
    0 + a = a       ∀ a ∈ Self

## Required methods

### `fn zero() -> Self`

Returns the additive identity element of `Self`, `0`.

# Purity

This function should return the same result at all times regardless of external mutable state, for example values stored in TLS or in `static mut`s.

### `fn is_zero(&self) -> bool`

Returns `true` if `self` is equal to the additive identity.

Loading content...

## Provided methods

### `fn set_zero(&mut self)`

Sets `self` to the additive identity element of `Self`, `0`.

Loading content...

## Implementations on Foreign Types

### `impl Zero for usize`[src]

#### `fn zero() -> usize`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for u8`[src]

#### `fn zero() -> u8`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for u16`[src]

#### `fn zero() -> u16`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for u32`[src]

#### `fn zero() -> u32`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for u64`[src]

#### `fn zero() -> u64`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for u128`[src]

#### `fn zero() -> u128`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for isize`[src]

#### `fn zero() -> isize`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for i8`[src]

#### `fn zero() -> i8`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for i16`[src]

#### `fn zero() -> i16`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for i32`[src]

#### `fn zero() -> i32`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for i64`[src]

#### `fn zero() -> i64`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for i128`[src]

#### `fn zero() -> i128`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for f32`[src]

#### `fn zero() -> f32`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl Zero for f64`[src]

#### `fn zero() -> f64`[src]

#### `fn is_zero(&self) -> bool`[src]

### `impl<T: Zero> Zero for Wrapping<T> where
Wrapping<T>: Add<Output = Wrapping<T>>,` [src]

#### `fn is_zero(&self) -> bool`[src]

#### `fn set_zero(&mut self)`[src]

#### `fn zero() -> Self`[src]

Loading content...

## Implementors

Loading content...

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)