Struct magnus::exception::Exception

#[repr(transparent)]
pub struct Exception(_);

Wrapper type for a Value known to be an instance of Ruby’s Exception class.

All Value methods should be available on this type through Deref, but some may be missed by this documentation.

Implementations

impl Exception

pub fn from_value(val: Value) -> Option<Self>

Return Some(Exception) if val is an Exception, None otherwise.

pub fn backtrace(&self) -> Result<Option<RArray>, Error>

Return the Ruby backtrace for the exception, as a RArray of RStrings.

Methods from Deref<Target = Value>

pub unsafe fn to_s(&self) -> Result<Cow<'_, str>, Error>

Convert self to a Rust string.

Safety

This may return a direct view of memory owned and managed by Ruby. Ruby may modify or free the memory backing the returned str, the caller must ensure this does not happen.

This can be used safely by immediately calling into_owned on the return value.

Examples

use magnus::{eval, QTRUE};

let value = QTRUE;
// safe as we neve give Ruby a chance to free the string.
let s = unsafe { value.to_s() }.unwrap().into_owned();
assert_eq!(s, "true");

pub unsafe fn classname(&self) -> Cow<'_, str>

Return the name of self’s class.

Safety

Ruby may modify or free the memory backing the returned str, the caller must ensure this does not happen.

This can be used safely by immediately calling into_owned on the return value.

Examples

use magnus::{eval, RHash};

let value = RHash::new();
// safe as we never give Ruby a chance to free the string.
let s = unsafe { value.classname() }.into_owned();
assert_eq!(s, "Hash");

Trait Implementations

impl Clone for Exception

fn clone(&self) -> Exception

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Exception

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

Formats the value using the given formatter.

impl Deref for Exception

type Target = Value

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Display for Exception

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

Formats the value using the given formatter.

impl From<Exception> for Error

fn from(val: Exception) -> Self

Converts to this type from the input type.

impl From<Exception> for Value

fn from(val: Exception) -> Self

Converts to this type from the input type.

impl IntoValue for Exception

fn into_value_with(self, _: &RubyHandle) -> Value

Convert self into Value.

fn into_value(self) -> Value

Convert self into Value.

unsafe fn into_value_unchecked(self) -> Value

Convert self into Value.

impl TryConvert for Exception

fn try_convert(val: Value) -> Result<Self, Error>

Convert val into Self.

impl Copy for Exception

impl ReprValue for Exception