# log::MetadataBuilder - Rust
API documentation for the Rust `MetadataBuilder` struct in crate `log`.
Keywords: rust, rustlang, rust-lang, MetadataBuilder

# Struct log::MetadataBuilder [−] [src]

    pub struct MetadataBuilder<'a> { /* fields omitted */ }

Builder for `Metadata`.

Typically should only be used by log library creators or for testing and "shim loggers". The `MetadataBuilder` can set the different parameters of a `Metadata` object, and returns the created object when `build` is called.

# Example

ⓘ

    let target = "myApp";
    use log::{Level, MetadataBuilder};
    let metadata = MetadataBuilder::new()
                        .level(Level::Debug)
                        .target(target)
                        .build();

## Implementations

### `impl<'a> MetadataBuilder<'a>` [src]

#### `pub fn new() -> MetadataBuilder<'a>` [src]

Construct a new `MetadataBuilder`.

The default options are:

- `level`: `Level::Info`
- `target`: `""`

#### `pub fn level(&mut self, arg: Level) -> &mut MetadataBuilder<'a>` [src]

Setter for `level`.

#### `pub fn target(&mut self, target: &'a str) -> &mut MetadataBuilder<'a>` [src]

Setter for `target`.

#### `pub fn build(&self) -> Metadata<'a>` [src]

Returns a `Metadata` object.

## Trait Implementations

### `impl<'a> Debug for MetadataBuilder<'a>` [src]

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

### `impl<'a> Eq for MetadataBuilder<'a>` [src]

### `impl<'a> Hash for MetadataBuilder<'a>` [src]

#### `fn hash<__H: Hasher>(&self, state: &mut __H)` [src]

Feeds this value into the given `Hasher`. Read more

#### `pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,` 1.3.0 [src]

Feeds a slice of this type into the given `Hasher`. Read more

### `impl<'a> Ord for MetadataBuilder<'a>` [src]

#### `fn cmp(&self, other: &MetadataBuilder<'a>) -> Ordering` [src]

This method returns an `Ordering` between `self` and `other`. Read more

#### `#[must_use]pub fn max(self, other: Self) -> Self` 1.21.0 [src]

Compares and returns the maximum of two values. Read more

#### `#[must_use]pub fn min(self, other: Self) -> Self` 1.21.0 [src]

Compares and returns the minimum of two values. Read more

#### `#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self` 1.50.0 [src]

Restrict a value to a certain interval. Read more

### `impl<'a> PartialEq<MetadataBuilder<'a>> for MetadataBuilder<'a>` [src]

#### `fn eq(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests for `!=`.

### `impl<'a> PartialOrd<MetadataBuilder<'a>> for MetadataBuilder<'a>` [src]

#### `fn partial_cmp(&self, other: &MetadataBuilder<'a>) -> Option<Ordering>` [src]

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &MetadataBuilder<'a>) -> bool` [src]

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a> StructuralEq for MetadataBuilder<'a>` [src]

### `impl<'a> StructuralPartialEq for MetadataBuilder<'a>` [src]

## Auto Trait Implementations

### `impl<'a> Send for MetadataBuilder<'a>` [src]

### `impl<'a> Sync for MetadataBuilder<'a>` [src]

### `impl<'a> Unpin for MetadataBuilder<'a>` [src]

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

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

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.