Enum CapabilityError 

#[non_exhaustive]
pub enum CapabilityError {
    Unsupported {
        family: &'static str,
        capability: Capability,
    },
    Unimplemented {
        family: &'static str,
        capability: Capability,
    },
    Unavailable {
        family: &'static str,
        capability: Capability,
        message: String,
    },
}

Static capability gating failure, returned by CapabilityNegotiation.

Decided without IO: it is a fact about whether a backend offers a capability, not whether a live call to it failed. The latter is BackendError.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unsupported

The backend never offers the requested capability.

Fields

family: &'static str

Backend family.

capability: Capability

Capability that was requested.

Unimplemented

The backend is expected to offer the capability but has not implemented it yet.

Fields

family: &'static str

Backend family.

capability: Capability

Capability that was expected.

Unavailable

The backend can offer the capability in principle, but not in the current state.

Fields

family: &'static str

Backend family.

capability: Capability

Capability that is temporarily unavailable.

message: String

Additional explanation from the backend adapter.

Implementations

impl CapabilityError

pub fn unsupported(family: &'static str, capability: Capability) -> Self

Creates an unsupported-capability error for the given backend.

pub fn unimplemented(family: &'static str, capability: Capability) -> Self

Creates an unimplemented-capability error for the given backend.

pub fn unavailable( family: &'static str, capability: Capability, message: impl Into<String>, ) -> Self

Creates an unavailable-capability error for the given backend.

Trait Implementations

impl Debug for CapabilityError

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

Formats the value using the given formatter.

impl Display for CapabilityError

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

Formats the value using the given formatter.

impl Error for CapabilityError

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

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

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

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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.