Function pushfunction

pub unsafe fn pushfunction<FUNC>(state: lua_State, callback: FUNC)
where
    FUNC: 'static + FnMut(lua_State) -> Result,

Pushes rust function/closure to lua stack.

Example

let state = newstate();
createtable(state, 0, 2);
pushfunction(state, |_| {
    println!("Hello there!");
    Ok(0)
});
setfield(state, -2, cstr!("test_immutable_closure"));
fn test_function(state: lua_State) -> Result {
    println!("Hello there, but from functuin, I guess.");
    Ok(0)
}
pushfunction(state, test_function);
setfield(state, -2, cstr!("test_immutable_function"));

let mut counter = 0;
pushfunction_mut(state, move |_| {
    println!("Here is yout counter!: {}", counter);
    pushinteger(state, counter);
    counter += 1;
    Ok(1)
});
setfield(state, -2, cstr!("test_mutable_closure"));
setfield(state, GLOBALSINDEX, cstr!("tests"));