Macro reg 

macro_rules! reg {
    ($(($name:expr, $func:expr)),* $(,)?) => { ... };
    ($($func:ident),* $(,)?) => { ... };
}

Generates a list of named functions (&[Reg]) to be used in module creation.

The macro takes as input a list of the functions to put in the Reg slice. The list’s elements can be:

• A tuple comprising of the function’s name (as a CStr) and the function itself (as a CFunction):

lua.return_module(reg![
    (c"foo", foo), // Any expression can be used inside the tuple!
    (c"bar", if condition { bar } else { baz })
])

• Just the function itself (as a CFunction), the function’s name will be derived from the given identifier:

// Only identifiers (no expressions) can be used here.
lua.register_module(c"my_global_module", reg![foo, bar, baz]);

(All elements of the input list must be specified the same way.)

The generated slice can be passed to various functions used in module creation:

• LuaState::return_module returns to the caller a table containing the slice’s functions.
• LuaState::register_module sets as a new global a table containing the slice’s functions.
• LuaState::new_module pushes onto the stack a table containing the slice’s functions.
• (Etc.)