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An object is represented by a JavaScript object literal, and an array is represented by a JavaScript array literal. The remaining values are represented by the corresponding literals. Because JSON is a subset of JavaScript literals, there are some restrictions on the syntax. In a JSON object, the name part of a name/value pair must be a string, and the value part must be one of the supported values. The following is the JSON representation of an object with two properties:

// We didn't expect to get here return false;

Notice that we updated our documentation for the public method as we changed the contract. We also have to return values from all of the exit points of our method. That has exposed another problem with our implementation: we never supported one motor at the stop condition, and the other at the driving or reversing condition. Well, that s fine we can return an error if we hit those conditions now. One problem with this contract is that we can t tell why our error occurred. Was it due to the state of the motors, or a problem with Rotate We could create an enum that lets us distinguish between these error types:

Figure 19-4. Supplying type arguments for all the type parameters of a generic class produces a constructed class from which actual class objects can be created. Figure 19-5 illustrates the difference between type parameters and type arguments. Generic class declarations have type parameters. Type arguments are the actual types you supply when creating a constructed type.

enum TurtleError { OK, RotateError, MotorStateError }

Then we could use the enum as shown in Example 6-9.

// Run the turtle for the specified duration // Returns one of the TurtleError values if a failure // occurs, or TurtleError.OK if it succeeds public TurtleError RunFor(double duration) { if (LeftMotorState == MotorState.Stopped && RightMotorState == MotorState.Stopped) { // If we are at a full stop, nothing will happen return TurtleError.OK; } // The motors are both running in the same direction // then we just drive if ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Running) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Reversed)) { Drive(duration); return TurtleError.OK; } // // // if The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running)) if (!Rotate(duration)) {

{

A constructed class type is used just like a regular type in creating references and instances. For example, the following code shows the creation of two class objects. The first line shows the creation of an object from a regular, non-generic class. This is a form that you should be completely familiar with by now. The second line shows the creation of an object from generic class SomeClass, instantiated with types short and int. The form is exactly analogous to the line above it, with the constructed class forms in place of a regular class name. MyNonGenClass MyNGC = new MyNonGenClass (); SomeClass<short, int> MySc = new SomeClass<short, int>(); Constructed class Constructed class As with non-generic classes, the reference and the instance can be created separately, as shown in Figure 19-6. The figure also shows that what is going on in memory is the same as for a non-generic class. The first line below the generic class declaration allocates a reference in the stack for variable MyClass. Its value is null. The second line allocates an instance in the heap, and assigns its reference to the variable.

}

} return TurtleError.MotorStateError;

{ "firstName":"John", "lastName":"Doe" }

}

return TurtleError.RotateError;

Many different class types can be constructed from the same generic class. Each one is a separate class type, just as if it had its own separate non-generic class declaration. For example, the following code shows the creation of two types from generic class SomeClass. The code is illustrated in Figure 19-7. One type is constructed with types short and int. The other is constructed with types int and long. class SomeClass< T1, T2 > { ... } class Program { static void Main() { SomeClass<short, int> First = new SomeClass<short, int>(); SomeClass<int, long> Second = new SomeClass<int, long>(); ... // Generic class

OK so far, although it is starting to get a bit tortuous, and we re going up only one call in the stack. But let s build and run anyway:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,-15) and is pointing at angle 0.00 radians. (0,-15) and is pointing at angle 0.00 radians. (0,-18.5355339059327) and is pointing at angle 0.00 radians.

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