Method JoinToSubgroup

engine/Poseidon/AI/AISubgroup.cpp:1419–1464

    }
}

void AISubgroup::JoinToSubgroup(AISubgroup* subgrp)
{
    AI_ERROR(subgrp);
    AI_ERROR(subgrp != this);
    if (subgrp == this)
    {
        Fail("Join with themselves.");
        return;
    }
    AI_ERROR(subgrp->GetGroup() == GetGroup());
    if (subgrp->GetGroup() != GetGroup())
    {
        Fail("Join to another group");
        return;
    }
    AI_ERROR(this != GetGroup()->MainSubgroup());

    PoseidonAssert(AssertValid());

    ClearAllCommands();

    while (_units.Size() > 0)
    {
        Ref<AIUnit> unit = _units[0];
        _units.Delete(0);
        if (!unit)
        {
            Fail("No unit");
            continue;
        }
        if (unit->GetSubgroup() != this)
        {
            Fail("Bad structure");
        }
        // remove explicitly - avoid refresh of destroyed subgroup
        unit->_subgroup = nullptr;
        subgrp->AddUnit(unit);
    }
    RemoveFromGroup();

    subgrp->SelectLeader();
    subgrp->RefreshPlan();
    subgrp->UpdateFormationPos();

    PoseidonAssert(subgrp->AssertValid());
}

// Mind