Macro nbt_lib::unwrap_to

macro_rules! unwrap_to {
    ($data:expr, $t:ty) => { ... };
    ($data:expr, $name:expr, $t:ty) => { ... };
}

Unwraps an Option<NbtValue> and converts it into a specified type.

Examples

use nbt_lib::unwrap_to;
use nbt_lib::NbtValue;
use nbt_lib::traits::FromNbtValue;

#[derive(Debug, PartialEq)]
struct Test { data: i32 };

impl FromNbtValue for Test {
    fn from_nbt_value(value: NbtValue) -> Result<Self, ()> {
        match value {
            NbtValue::Int(v) => Ok(Self { data: v }),
            _ => Err(())
        }
    }
}

fn test() -> Result<Test, ()> {
    let data: Option<NbtValue> = Some(NbtValue::Int(42));
    let result: Test = unwrap_to!(data, Test);
    Ok(result)
}
assert_eq!(test(), Ok(Test { data: 42 }));

use nbt_lib::unwrap_to;
use nbt_lib::NbtValue;
use std::collections::HashMap;
use nbt_lib::traits::FromNbtValue;

#[derive(Debug, PartialEq)]
struct Test { data: i32 };

impl FromNbtValue for Test {
    fn from_nbt_value(value: NbtValue) -> Result<Self, ()> {
        match value {
            NbtValue::Int(v) => Ok(Self { data: v }),
            _ => Err(())
        }
    }
}

fn test() -> Result<Test, ()> {
    let mut map = HashMap::new();
    map.insert("data".to_string(), NbtValue::Int(42));
    let data: HashMap<String, NbtValue> = map;
    let result: Test = unwrap_to!(data, "data", Test);
    Ok(result)
}
assert_eq!(test(), Ok(Test { data: 42 }));

Errors

Returns an error if the option is None or if the conversion fails.