Trait veloren_common_assets::Loader
pub trait Loader<T> {
// Required method
fn load(
content: Cow<'_, [u8]>,
ext: &str
) -> Result<T, Box<dyn Error + Send + Sync>>;
}Expand description
Specifies how an asset is loaded.
With this trait, you can easily specify how you want your data to be loaded.
This trait is generic, so the same Loader type can be used to load several
asset types.
Basic usage
Most of the time, you don’t need to implement this trait yourself, or even care about the definition, as there are implementations for common formats and conversions. Don’t forget to enable the corresponding feature if needed !
Example
use serde::Deserialize;
use assets_manager::{Asset, loader};
// The struct you want to load
#[derive(Deserialize)]
struct Point {
x: i32,
y: i32,
}
impl Asset for Point {
const EXTENSION: &'static str = "ron";
// Specify here how to convert raw data
type Loader = loader::RonLoader;
}Implementing Loader
Function load does the conversion from raw bytes to the concrete Rust
value.
Example
use assets_manager::{Asset, BoxedError, loader::Loader};
use std::{borrow::Cow, error::Error, io, str};
enum Fruit {
Apple,
Banana,
Pear,
}
struct FruitLoader;
impl Loader<Fruit> for FruitLoader {
fn load(content: Cow<[u8]>, _: &str) -> Result<Fruit, BoxedError> {
match str::from_utf8(&content)?.trim() {
"apple" => Ok(Fruit::Apple),
"banana" => Ok(Fruit::Banana),
"pear" => Ok(Fruit::Pear),
_ => Err("Invalid fruit".into()),
}
}
}
impl Asset for Fruit {
const EXTENSION: &'static str = "txt";
type Loader = FruitLoader;
}
Required Methods§
Object Safety§
This trait is not object safe.