[][src]Struct rocket::error::LaunchError

pub struct LaunchError { /* fields omitted */ }

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.

Methods

impl LaunchError[src]

pub fn kind(&self) -> &LaunchErrorKind[src]

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

impl Debug for LaunchError[src]

impl Display for LaunchError[src]

impl Drop for LaunchError[src]

impl Error for LaunchError[src]

impl From<Error> for LaunchError[src]

impl From<Error> for LaunchError[src]

Auto Trait Implementations

impl !RefUnwindSafe for LaunchError

impl Send for LaunchError

impl Sync for LaunchError

impl Unpin for LaunchError

impl !UnwindSafe for LaunchError

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T, I> AsResult<T, I> for T where
    I: Input, 

impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

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

impl<T> ToString for T where
    T: Display + ?Sized
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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.

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.

impl<T> Typeable for T where
    T: Any