Version 5.5.5 introduces two useful helpers for simplification of cooperation creation:

so_5::rt::environment_t::introduce_coop() template method and
so_5::rt::introduce_child_coop() template function.

Just for comparison of new cooperation creation and registration:

// Old approach (before v.5.5.5):
auto coop = env.create_coop( so_5::autoname );
coop->make_agent< first_agent >( some_params() );
coop->make_agent< second_agent >( some_params() );
env.register_coop( std::move( coop ) );
 
// New approach (since v.5.5.5, in C++11):
env.introduce_coop( []( so_5::rt::agent_coop_t & coop ) {
  coop.make_agent< first_agent >( some_params() );
  coop.make_agent< second_agent >( some_params() );
} );
 
// New approach (since v.5.5.5, in C++14):
env.introduce_coop( []( auto & coop ) {
  coop.make_agent< first_agent >( some_params() );
  coop.make_agent< second_agent >( some_params() );
} );

Similar comparison for creation of a child cooperation:

// Old approach (before v.5.5.5):
void parent_coop::so_evt_start() override
{
  auto coop = so_5::rt::create_child_coop( *this, so_5::autoname );
  coop->make_agent< first_agent >( some_params() );
  coop->make_agent< second_agent >( some_params() );
  env.register_coop( std::move( coop ) );
}
 
// New approach (since v.5.5.5, in C++11):
void parent_coop::so_evt_start() override
{
  so_5::rt::introduce_child_coop( *this, [this]( so_5::rt::agent_coop_t & coop ) {
    coop.make_agent< first_agent >( some_params() );
    coop.make_agent< second_agent >( some_params() );
  } );
}
 
// New approach (since v.5.5.5, in C++14):
void parent_coop::so_evt_start() override
{
  so_5::rt::introduce_child_coop( *this, [this]( auto & coop ) {
    coop.make_agent< first_agent >( some_params() );
    coop.make_agent< second_agent >( some_params() );
  } );
}

New introduce_coop and introduce_child_coop are just thing wrappers around create_coop and create_child_coop. Because of that new method/function accepts all combination of parameters appropriate for create_coop/create_child_coop. It means that it is possible to write:

// Automatic generation of cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
env.introduce_coop( so_5::autoname, []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Explicitly specified cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
env.introduce_coop( "db_workers", []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Automatic generation of cooperation name.
// Explicitly specified main dispatcher.
env.introduce_coop( so_5::autoname,
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Explicitly specified cooperation name.
// Explicitly specified main dispatcher.
env.introduce_coop( "logger",
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );

But the usage of so_5::autoname could be omitted:

// Automatic generation of cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
env.introduce_coop( []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Automatic generation of cooperation name.
// Explicitly specified main dispatcher.
env.introduce_coop(
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );

The same rules are for introduce_child_coop:

// Automatic generation of cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
so_5::rt::introduce_child_coop( *this, []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Automatic generation of cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
so_5::rt::introduce_child_coop( *this, so_5::autoname,
  []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Explicitly specified cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
so_5::rt::introduce_child_coop( *this, "db_workers",
  []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Automatic generation of cooperation name.
// Default dispatcher as a main dispatcher for cooperation.
so_5::rt::introduce_child_coop( *this,
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Automatic generation of cooperation name.
// Explicitly specified main dispatcher.
so_5::rt::introduce_child_coop( *this, so_5::autoname,
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );
 
// Explicitly specified cooperation name.
// Explicitly specified main dispatcher.
so_5::rt::introduce_child_coop( *this, "logger",
  so_5::disp::one_thread::create_private_disp()->binder(),
  []( so_5::rt::agent_coop_t & coop ) {...} );