Macro trg_new_trigger_func 

macro_rules! trg_new_trigger_func {
    ($func_name:ident, $arg_name:ident, $body:block) => { ... };
}

This macro generates a function that takes a reference to a Box<dyn Any> as an argument and returns a bool. The function body ($body) determines whether the condition is met.

Usage

Use for defining functions required to create a Trigger object.

Parameters

• func_name: An identifier (ident) representing the generated function name.
• arg_name: An identifier (ident) representing the function argument name.
• body: A block (block) containing the function implementation.

Example

// Define a trigger function that print the argument than evaluate whether
// the argument is 5
trg_new_trigger_func!(func_name, arg, {
    let number = trg::cast_arg::<u32>(arg)?;
    println!("{}", number);
    *number == 5
});