Trait gdnative_core::export::user_data::MapOwned

pub trait MapOwned: UserData {
    type Err: Debug;
    fn map_owned<F, U>(&self, op: F) -> Result<U, Self::Err>
    where
        F: FnOnce(Self::Target) -> U;
}

Trait for wrappers that can be mapped once.

Associated Types

type Err: Debug

Required methods

fn map_owned<F, U>(&self, op: F) -> Result<U, Self::Err> where
    F: FnOnce(Self::Target) -> U, 

Maps a T to U. Called for methods that take self. This method may fail with an error if it is called more than once on the same object.

Implementations of this method must not panic. Failures should be indicated by returning Err.

Implementors

impl<T> MapOwned for Once<T> where
    T: NativeClass + Send, 

type Err = ValueTaken