source: tags/1.2.0/AI Template/Project/Persistent.cs

using System;
using System.Collections.Generic;
using CevoAILib;

namespace AI
{
        unsafe class Persistent
        {
                struct MyData
                {
                        public int Version;
                        public fixed short EstimatedStrength[Cevo.MaxNumberOfNations];
                        public Advance LastResearch;
                        public fixed sbyte BiggestFriend[Cevo.MaxNumberOfNations];
                }

                Empire theEmpire;
                MyData* data;

                public Persistent(Empire empire, IntPtr dataPtr)
                {
                        if (sizeof(MyData) > 4096)
                                throw new Exception("Persistent data size exceeds limit!");

                        this.theEmpire = empire;
                        this.data = (MyData*)dataPtr;

                        // initialization
                        data->LastResearch = Advance.None;
                        for (int nationID = 0; nationID < Cevo.MaxNumberOfNations; nationID++)
                        {
                                data->EstimatedStrength[nationID] = 100;
                                data->BiggestFriend[nationID] = (sbyte)Nation.None.ID;
                        }
                }

                public int Version
                {
                        get
                        {
                                return data->Version;
                        }
                        set
                        {
                                data->Version = value;
                        }
                }

                public int EstimatedStrength(Nation nation)
                {
                        return data->EstimatedStrength[nation.ID];
                }

                public void SetEstimatedStrength(Nation nation, int strength)
                {
                        data->EstimatedStrength[nation.ID] = (short)strength;
                }

                public Advance LastResearch
                {
                        get
                        {
                                return data->LastResearch;
                        }
                        set
                        {
                                data->LastResearch = value;
                        }
                }

                public Nation BiggestFriendOf(Nation nation)
                {
                        return new Nation(theEmpire, data->BiggestFriend[nation.ID]);
                }

                public void SetBiggestFriendOf(Nation nation, Nation friend)
                {
                        data->BiggestFriend[nation.ID] = (sbyte)friend.ID;
                }
        }
}