# AsyncConfigBuilder in config::builder - Rust
The asynchronous configuration builder.
Keywords: rust, rustlang, rust-lang, AsyncConfigBuilder

# Struct config::builder::AsyncConfigBuilder

source · [−]

    pub struct AsyncConfigBuilder {}

Expand description

The asynchronous configuration builder.

Similar to a `ConfigBuilder` it maintains a set of defaults, a set of sources, and overrides.

Defaults do not override anything, sources override defaults, and overrides override anything else. Within those three groups order of adding them at call site matters - entities added later take precedence.

For more detailed description and examples see `ConfigBuilder`. `AsyncConfigBuilder` is just an extension of it that takes async functions into account.

To obtain a `Config` call `build` or `build_cloned`

## Example

Since this library does not implement any `AsyncSource` an example in rustdocs cannot be given. Detailed explanation about why such a source is not implemented is in `AsyncSource`’s documentation.

Refer to `ConfigBuilder` for similar API sample usage or to the examples folder of the crate, where such a source is implemented.

## Trait Implementations

source

### impl Clone for AsyncConfigBuilder

source

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

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

source

### impl Debug for AsyncConfigBuilder

source

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

Formats the value using the given formatter. Read more

source

### impl Default for AsyncConfigBuilder

source

#### fn default() -> AsyncConfigBuilder

Returns the “default value” for a type. Read more

## Auto Trait Implementations

### impl RefUnwindSafe for AsyncConfigBuilder

### impl Send for AsyncConfigBuilder

### impl Sync for AsyncConfigBuilder

### impl Unpin for AsyncConfigBuilder

### impl UnwindSafe for AsyncConfigBuilder

## Blanket Implementations

source

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

source

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

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

source

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

const: unstable · source

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

Immutably borrows from an owned value. Read more

source

### 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

source

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

const: unstable · source

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

Returns the argument unchanged.

source

### 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.

source

### impl<T> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

source

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

Creates owned data from borrowed data, usually by cloning. Read more

source

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

source

### 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.

source

### 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.