Terraria.ModLoader.NPCLoader.ReserveNPCID C# (CSharp) Method

        internal static int ReserveNPCID()
        {
            if (ModNet.AllowVanillaClients) throw new Exception("Adding npcs breaks vanilla client compatiblity");

            int reserveID = nextNPC;
            nextNPC++;
            return reserveID;
        }

        public void AddNPC(string name, ModNPC npc, string texture)
        {
            int id = NPCLoader.ReserveNPCID();

            npc.npc.name       = name;
            npc.npc.type       = id;
            npcs[name]         = npc;
            NPCLoader.npcs[id] = npc;
            npc.texture        = texture;
            npc.mod            = this;
        }