Trait TryAsMut 

pub trait TryAsMut<T: ?Sized> {
    type Error: Error;

    // Required method
    fn try_as_mut(&mut self) -> Result<&mut T, Self::Error>;
}

Example

let mut a = TestStruct(TestEnum::AType(String::from("a_type")));
let a: Result<&mut str, TestError> = a.try_as_mut();
assert!(a.is_ok());
 
let mut a: TestStruct = TestStruct(TestEnum::BType(BType()));
let a: Result<&mut str, TestError> = a.try_as_mut();
assert!(a.is_err());
 
let mut b = TestStruct(TestEnum::BType(BType()));
let b: Result<&mut BType, TestError> = b.try_as_mut();
assert!(b.is_ok());
 
let mut b = TestStruct(TestEnum::AType(String::from("a_type")));
let b: Result<&mut BType, TestError> = b.try_as_mut();
assert!(b.is_err());

Required Associated Types

type Error: Error

Required Methods

fn try_as_mut(&mut self) -> Result<&mut T, Self::Error>

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors