Struct mlua::Function

pub struct Function<'lua>(_);

Handle to an internal Lua function.

Implementations

impl<'lua> Function<'lua>

pub fn call<A: ToLuaMulti<'lua>, R: FromLuaMulti<'lua>>(
    &self,
    args: A
) -> Result<R>

Calls the function, passing args as function arguments.

The function’s return values are converted to the generic type R.

Examples

Call Lua’s built-in tostring function:

let globals = lua.globals();

let tostring: Function = globals.get("tostring")?;

assert_eq!(tostring.call::<_, String>(123)?, "123");

Call a function with multiple arguments:

let sum: Function = lua.load(
    r#"
        function(a, b)
            return a + b
        end
"#).eval()?;

assert_eq!(sum.call::<_, u32>((3, 4))?, 3 + 4);

pub fn call_async<'fut, A, R>(&self, args: A) -> LocalBoxFuture<'fut, Result<R>> where
    'lua: 'fut,
    A: ToLuaMulti<'lua>,
    R: FromLuaMulti<'lua> + 'fut, 

This is supported on crate feature async only.

Returns a Feature that, when polled, calls self, passing args as function arguments, and drives the execution.

Internally it wraps the function to an AsyncThread.

Requires feature = "async"

Examples

use std::time::Duration;
use futures_timer::Delay;

let sleep = lua.create_async_function(move |_lua, n: u64| async move {
    Delay::new(Duration::from_millis(n)).await;
    Ok(())
})?;

sleep.call_async(10).await?;

pub fn bind<A: ToLuaMulti<'lua>>(&self, args: A) -> Result<Function<'lua>>

Returns a function that, when called, calls self, passing args as the first set of arguments.

If any arguments are passed to the returned function, they will be passed after args.

Examples

let sum: Function = lua.load(
    r#"
        function(a, b)
            return a + b
        end
"#).eval()?;

let bound_a = sum.bind(1)?;
assert_eq!(bound_a.call::<_, u32>(2)?, 1 + 2);

let bound_a_and_b = sum.bind(13)?.bind(57)?;
assert_eq!(bound_a_and_b.call::<_, u32>(())?, 13 + 57);

pub fn dump(&self, strip: bool) -> Vec<u8>

Dumps the function as a binary chunk.

If strip is true, the binary representation may not include all debug information about the function, to save space.

Trait Implementations

impl<'lua> Clone for Function<'lua>

fn clone(&self) -> Function<'lua>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'lua> Debug for Function<'lua>

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

Formats the value using the given formatter.

impl<'lua> FromLua<'lua> for Function<'lua>

fn from_lua(value: Value<'lua>, _: &'lua Lua) -> Result<Function<'lua>>

Performs the conversion.

impl<'lua> PartialEq<Function<'lua>> for Function<'lua>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'lua> ToLua<'lua> for Function<'lua>

fn to_lua(self, _: &'lua Lua) -> Result<Value<'lua>>

Performs the conversion.