Struct rocket::error::LaunchError

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pub struct LaunchError { /* private fields */ }
Expand description

An error that occurs during launch.

A LaunchError is returned by launch() when launching an application fails.

§Panics

A value of this type panics if it is dropped without first being inspected. An inspection occurs when any method is called. For instance, if println!("Error: {}", e) is called, where e: LaunchError, the Display::fmt method being called by println! results in e being marked as inspected; a subsequent drop of the value will not result in a panic. The following snippet illustrates this:

let error = rocket::ignite().launch();

// This line is only reached if launching failed. This "inspects" the error.
println!("Launch failed! Error: {}", error);

// This call to drop (explicit here for demonstration) will do nothing.
drop(error);

When a value of this type panics, the corresponding error message is pretty printed to the console. The following illustrates this:

let error = rocket::ignite().launch();

// This call to drop (explicit here for demonstration) will result in
// `error` being pretty-printed to the console along with a `panic!`.
drop(error);

§Usage

A LaunchError value should usually be allowed to drop without inspection. There are two exceptions to this suggestion.

  1. If you are writing a library or high-level application on-top of Rocket, you likely want to inspect the value before it drops to avoid a Rocket-specific panic!. This typically means simply printing the value.

  2. You want to display your own error messages.

Implementations§

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impl LaunchError

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pub fn kind(&self) -> &LaunchErrorKind

Retrieve the kind of the launch error.

§Example
let error = rocket::ignite().launch();

// This line is only reached if launch failed.
let error_kind = error.kind();

Trait Implementations§

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impl Debug for LaunchError

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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 LaunchError

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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 Drop for LaunchError

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl Error for LaunchError

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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
1.30.0 · source§

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any. Read more
1.0.0 · source§

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type-based access to context intended for error reports. Read more
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impl From<Error> for LaunchError

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fn from(error: Error) -> LaunchError

Converts to this type from the input type.
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impl From<Error> for LaunchError

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fn from(error: Error) -> LaunchError

Converts to this type from the input type.

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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, I> AsResult<T, I> for T
where I: Input,

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fn as_result(self) -> Result<T, ParseErr<I>>

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where T: ?Sized,

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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,

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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

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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> IntoCollection<T> for T

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fn into_collection<A>(self) -> SmallVec<A>
where A: Array<Item = T>,

Converts self into a collection.
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fn mapped<U, F, A>(self, f: F) -> SmallVec<A>
where F: FnMut(T) -> U, A: Array<Item = U>,

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Typeable for T
where T: Any,

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fn get_type(&self) -> TypeId

Get the TypeId of this object.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V