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Listing 7-6. Base Class for a State class State(object): def __init__(self, name): self.name = name def do_actions(self): pass def check_conditions(self): pass def entry_actions(self): pass def exit_actions(self): pass Before we build the states, we need to build a class that will manage them. The StateMachine class (Listing 7-7) stores an instance of each of the states in a dictionary and manages the currently active state. The think function runs once per frame, and calls the do_actions on the active state to do whatever the state was designed to do; the exploring state will select random places to walk to, the seeking state will move toward the leaf, and so forth. The think function also calls the state s check_conditions function to check all of the link conditions. If check_conditions returns a string, a new active state will be selected and any exit and entry actions will run. Listing 7-7. The State Machine Class class StateMachine(object): def __init__(self): self.states = {} # Stores the states self.active_state = None # The currently active state def add_state(self, state): # Add a state to the internal dictionary self.states[state.name] = state def think(self):

Although it is more likely that you will want to call native code from F# code, there may be some circumstances that you would want to call F# library functions from native code For example, suppose you have a large application written in C++, and perhaps you are happy for the user interface to remain in C++ but want to migrate some logic that performs complicated mathematical calculations to F# for easier maintenance In this case, you would want to call F# from native code The easiest way to do this is to use the tools provided with NET to create a COM wrapper for your F# assembly You can then use the COM runtime to call the F# functions from C++ To expose functions though COM, you need to develop them in a certain way.

The first web layer task is to add a button to the DisplayShoppingCart.aspx so that users can start the process of placing their order. Listing 15-12 shows the updated DisplayShoppingCart.aspx code. Listing 15-12. DisplayShoppingCart.aspx File <%@ <%@ <%@ <%@ <%@ <%@ Import Namespace="BusinessLayer" %> Import Namespace="DataLayer" %> Import Namespace="System.Collections" %> Register TagPrefix="Categories" TagName="LeftNav" Src="Categories.ascx" %> Register TagPrefix="TopNav" TagName="TopNav" Src="TopNav.ascx" %> Page language="c#" CodeFile="DisplayShoppingCart.aspx.cs" AutoEventWireup="false" Inherits="NorthwindWeb.DisplayShoppingCart" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3c.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3c.org/1999/xhtml"> <head> <title>Display Shopping Cart</title> </head> <body> <table id="Table1" cellspacing="1" cellpadding="1" width="100%" border="0"> <tr> <td colspan="2" style="height: 43px"> <TopNav:TopNav id="topnav" runat="server" /> </td> </tr>

# Only continue if there is an active state if self.active_state is None: return # Perform the actions of the active state, and check conditions self.active_state.do_actions() new_state_name = self.active_state.check_conditions() if new_state_name is not None: self.set_state(new_state_name) def set_state(self, new_state_name): # Change states and perform any exit / entry actions if self.active_state is not None: self.active_state.exit_actions() self.active_state = self.states[new_state_name] self.active_state.entry_actions() Now that we have a functioning state machine class, we can start implementing each of the individual states by deriving from the State class and implementing some of its functions. The first state we will implement is the exploring state, which we will call AntStateExploring (see Listing 7-8). The entry actions for this state give the ant a random speed and set its destination to a random point on the screen. The main actions, in the do_actions function, select another random destination if the expression randint(1, 20) == 1 is true, which will happen in about 1 in every 20 calls, since randint (in the random module) selects a random number that is greater than or equal to the first parameter, and less than or equal to the second. This gives us the antlike random searching behavior we are looking for. The two outgoing links for the exploring state are implemented in the check_conditions function. The first condition looks for a leaf entity that is within 100 pixels from an ant s location (because that s how far our ants can see). If there is a nearby leaf, then check_conditions records its id and returns the string seeking, which will instruct the state machine to switch to the seeking state. The remaining condition will switch to hunting if there are any spiders inside the nest and within 100 pixels of the ant s location.

First, you must define an interface that will specify the contract for your functions, the members of the interface must be written using named arguments (see the section on Calling F# Libraries from C# earlier in the chapter), and the interface itself must be marked with the SystemRuntimeInteropServicesGuid attribute Then you must provide a class that implements the interface This too must be marked the SystemRuntime InteropServicesGuid attribute and also the SystemRuntimeInteropServicesClassInterface, and you should always pass the ClassInterfaceTypeNone enumeration member to the ClassInterface attribute constructor to say that no interface should be automatically generated Let s look at an example of doing this Suppose you want to expose two functions to your unmanaged client called Add and Sub Create an interface IMath in the namespace Strangelights, and then create a class Math to implement this interface.

Caution Random numbers are a good way to make your game more fun, because predictable games can get dull after a while. But be careful with random numbers if something goes wrong, it may be difficult to reproduce the problem!