Struct Function

pub struct Function(/* private fields */);

Handle to an internal Lua function.

Implementations

impl Function

pub fn call<R: FromLuaMulti>(&self, args: impl IntoLuaMulti) -> 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<R>( &self, args: impl IntoLuaMulti, ) -> impl Future<Output = Result<R>>

where R: FromLuaMulti,

Available on crate feature async only.

Returns a future 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;

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

sleep.call_async(10).await?;

pub fn bind(&self, args: impl IntoLuaMulti) -> Result<Function>

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 environment(&self) -> Option<Table>

Returns the environment of the Lua function.

By default Lua functions shares a global environment.

This function always returns None for Rust/C functions.

pub fn set_environment(&self, env: Table) -> Result<bool>

Sets the environment of the Lua function.

The environment is a table that is used as the global environment for the function. Returns true if environment successfully changed, false otherwise.

This function does nothing for Rust/C functions.

pub fn info(&self) -> FunctionInfo

Returns information about the function.

Corresponds to the >Sn what mask for lua_getinfo when applied to the function.

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

Available on non-crate feature luau only.

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.

For Luau a Compiler can be used to compile Lua chunks to bytecode.

pub fn coverage<F>(&self, func: F)

where F: FnMut(CoverageInfo),

Available on crate feature luau only.

Retrieves recorded coverage information about this Lua function including inner calls.

This function takes a callback as an argument and calls it providing CoverageInfo snapshot per each executed inner function.

Recording of coverage information is controlled by Compiler::set_coverage_level option.

Requires feature = "luau"

pub fn to_pointer(&self) -> *const c_void

Converts this function to a generic C pointer.

There is no way to convert the pointer back to its original value.

Typically this function is used only for hashing and debug information.

impl Function

pub fn wrap<A, R, F>(func: F) -> impl IntoLua

where A: FromLuaMulti, R: IntoLuaMulti, F: Fn(&Lua, A) -> Result<R> + MaybeSend + 'static,

Wraps a Rust function or closure, returning an opaque type that implements IntoLua trait.

pub fn wrap_mut<A, R, F>(func: F) -> impl IntoLua

where A: FromLuaMulti, R: IntoLuaMulti, F: FnMut(&Lua, A) -> Result<R> + MaybeSend + 'static,

Wraps a Rust mutable closure, returning an opaque type that implements IntoLua trait.

pub fn wrap_async<A, R, F, FR>(func: F) -> impl IntoLua

where A: FromLuaMulti, R: IntoLuaMulti, F: Fn(Lua, A) -> FR + MaybeSend + 'static, FR: Future<Output = Result<R>> + MaybeSend + 'static,

Available on crate feature async only.

Wraps a Rust async function or closure, returning an opaque type that implements IntoLua trait.

Trait Implementations

impl Clone for Function

fn clone(&self) -> Function

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Function

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

Formats the value using the given formatter.

impl FromLua for Function

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

Performs the conversion.

impl IntoLua for &Function

fn into_lua(self, _: &Lua) -> Result<Value>

Performs the conversion.

impl IntoLua for Function

fn into_lua(self, _: &Lua) -> Result<Value>

Performs the conversion.

impl PartialEq for Function

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.