# Level in log - Rust
An enum representing the available verbosity levels of the logger.
Keywords: rust, rustlang, rust-lang, Level

# Enum log::Level

source · [−]

    #[repr(usize)]
    pub enum Level {
        Error,
        Warn,
        Info,
        Debug,
        Trace,
    }

Expand description

An enum representing the available verbosity levels of the logger.

Typical usage includes: checking if a certain `Level` is enabled with `log_enabled!`, specifying the `Level` of `log!`, and comparing a `Level` directly to a `LevelFilter`.

## Variants

### `Error`

The “error” level.

Designates very serious errors.

### `Warn`

The “warn” level.

Designates hazardous situations.

### `Info`

The “info” level.

Designates useful information.

### `Debug`

The “debug” level.

Designates lower priority information.

### `Trace`

The “trace” level.

Designates very low priority, often extremely verbose, information.

## Implementations

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### impl Level

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#### pub fn max() -> Level

Returns the most verbose logging level.

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#### pub fn to_level_filter(&self) -> LevelFilter

Converts the `Level` to the equivalent `LevelFilter`.

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#### pub fn as_str(&self) -> &'static str

Returns the string representation of the `Level`.

This returns the same string as the `fmt::Display` implementation.

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#### pub fn iter() -> impl Iterator<Item = Self>

Iterate through all supported logging levels.

The order of iteration is from more severe to less severe log messages.

##### Examples

    use log::Level;

    let mut levels = Level::iter();

    assert_eq!(Some(Level::Error), levels.next());
    assert_eq!(Some(Level::Trace), levels.last());

## Trait Implementations

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### impl Clone for Level

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#### fn clone(&self) -> Level

Returns a copy of the value. Read more

1.0.0 · source

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more

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### impl Debug for Level

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

Formats the value using the given formatter. Read more

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### impl Display for Level

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#### fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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### impl FromStr for Level

#### type Err = ParseLevelError

The associated error which can be returned from parsing.

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#### fn from_str(level: &str) -> Result<Level, Self::Err>

Parses a string `s` to return a value of this type. Read more

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### impl Hash for Level

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#### fn hash<__H: Hasher>(&self, state: &mut __H)

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

1.3.0 · source

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

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

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### impl Ord for Level

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#### fn cmp(&self, other: &Level) -> Ordering

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

1.21.0 · source

#### fn max(self, other: Self) -> Self

Compares and returns the maximum of two values. Read more

1.21.0 · source

#### fn min(self, other: Self) -> Self

Compares and returns the minimum of two values. Read more

1.50.0 · source

#### fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval. Read more

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### impl PartialEq<Level> for Level

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#### fn eq(&self, other: &Level) -> bool

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

1.0.0 · source

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`.

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### impl PartialEq<Level> for LevelFilter

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#### fn eq(&self, other: &Level) -> bool

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

1.0.0 · source

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`.

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### impl PartialEq<LevelFilter> for Level

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#### fn eq(&self, other: &LevelFilter) -> bool

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

1.0.0 · source

#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`.

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### impl PartialOrd<Level> for Level

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#### fn partial_cmp(&self, other: &Level) -> Option<Ordering>

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

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#### fn lt(&self, other: &Level) -> bool

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

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#### fn le(&self, other: &Level) -> bool

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

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#### fn gt(&self, other: &Level) -> bool

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

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#### fn ge(&self, other: &Level) -> bool

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

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### impl PartialOrd<Level> for LevelFilter

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#### fn partial_cmp(&self, other: &Level) -> Option<Ordering>

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

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#### fn lt(&self, other: &Level) -> bool

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

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#### fn le(&self, other: &Level) -> bool

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

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#### fn gt(&self, other: &Level) -> bool

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

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#### fn ge(&self, other: &Level) -> bool

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

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### impl PartialOrd<LevelFilter> for Level

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#### fn partial_cmp(&self, other: &LevelFilter) -> Option<Ordering>

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

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#### fn lt(&self, other: &LevelFilter) -> bool

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

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#### fn le(&self, other: &LevelFilter) -> bool

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

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#### fn gt(&self, other: &LevelFilter) -> bool

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

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#### fn ge(&self, other: &LevelFilter) -> bool

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

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### impl Copy for Level

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### impl Eq for Level

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### impl StructuralEq for Level

## Auto Trait Implementations

### impl RefUnwindSafe for Level

### impl Send for Level

### impl Sync for Level

### impl Unpin for Level

### impl UnwindSafe for Level

## Blanket Implementations

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

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#### fn type_id(&self) -> TypeId

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

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

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

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

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.