Macro init_agent_indices 

macro_rules! init_agent_indices {
    ($name:ident, $agent_type:expr) => { ... };
}

A macro for initializing a global variable containing singleton agent index.

Usage is init_agent_indices! { NAME, agent_type }. It will initialize the global variable created by declare_agent_indices using the (non-singleton) agent_type created to initialize the model.