Enum TypeMismatchError 

pub enum TypeMismatchError {
    NullPointer,
    InvalidTypeId,
    Mismatch {
        expected: &'static str,
        found: &'static str,
    },
    Restored {
        type_name: &'static str,
        package_classes: &'static [&'static str],
        package_message: Option<&'static str>,
    },
    OtherVersion {
        type_name: &'static str,
        crate_name: &'static str,
        saved: &'static str,
        current: &'static str,
        package_classes: &'static [&'static str],
        package_message: Option<&'static str>,
    },
}

Error returned when type checking fails in try_from_sexp_with_error.

The found field in Mismatch contains a &'static str from R’s interned symbol table, which persists for the R session lifetime.

Variants

NullPointer

The external pointer’s address was null, and it was not built by ExternalPtr (R’s new("externalptr"), a cleared pointer).

InvalidTypeId

The prot slot didn’t contain a valid type symbol.

Mismatch

The stored type doesn’t match the expected type.

Fields

expected: &'static str

Expected Rust type name from this pointer wrapper.

found: &'static str

Actual stored Rust type name found in pointer metadata.

Restored

A pointer this version of the crate built, restored from a saved session without its Rust value (RESTORED_NO_VALUE_CLASS).

Fields

type_name: &'static str

The type’s name.

package_classes: &'static [&'static str]

The package’s classes for the type (TypedExternal::RESTORED_ERROR_CLASS).

package_message: Option<&'static str>

The package’s message for the type (TypedExternal::RESTORED_ERROR_MESSAGE).

OtherVersion

A pointer another version of the crate saved (RESTORED_OTHER_VERSION_CLASS).

Fields

type_name: &'static str

The type’s name.

crate_name: &'static str

The crate’s name.

saved: &'static str

The version that saved the pointer.

current: &'static str

This version.

package_classes: &'static [&'static str]

The package’s classes for the type (TypedExternal::RESTORED_ERROR_CLASS).

package_message: Option<&'static str>

The package’s message for the type (TypedExternal::RESTORED_ERROR_MESSAGE).

Implementations

impl TypeMismatchError

pub fn restored_classes(&self) -> Option<Vec<&'static str>>

The condition classes of the error about a restored pointer: the package’s classes, then the specific class, then RESTORED_CLASS; None for the other variants.

Trait Implementations

impl Clone for TypeMismatchError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TypeMismatchError

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

Formats the value using the given formatter.

impl Display for TypeMismatchError

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

Formats the value using the given formatter.

impl Error for TypeMismatchError

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

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

#[doc(hidden)]

fn type_id(&self, _: Internal) -> TypeId

where Self: 'static,

🔬This is a nightly-only experimental API. (error_type_id)

Gets the TypeId of self.

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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 104 bytes

Size for each variant:

• NullPointer: 0 bytes
• InvalidTypeId: 0 bytes
• Mismatch: 32 bytes
• Restored: 48 bytes
• OtherVersion: 96 bytes