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Next, the current value of the series, val, and the starting value, start, are declared to be objects of the generic type T Then, a delegate called IncByTwo is declared This delegate defines the form of a method that will be used to increase an object of type T by two In order for ByTwos to work with any type of data, there must be some way to define what an increase by two means for each type of data This is achieved by passing to the ByTwos constructor a reference to a method that performs an increase by two This reference is stored in incr When the next element in the series is needed, that method is called through the incr delegate to obtain the next value in the series Notice the class ThreeD It encapsulates three-dimensional (X,Z,Y) coordinates It is used to demonstrate ByTwos on a class type In GenIntfDemo, three increment methods are declared; one for int, one for double, and one for objects of type ThreeD These are passed to the ByTwos constructor when objects of their respective types are created Pay special attention to ThreeDPlusTwo( ), shown here:

// Define plus two for ThreeD static ThreeD ThreeDPlusTwo(ThreeD v) { if(v==null) return new ThreeD(0, 0, 0); else return new ThreeD(vx + 2, vy + 2, vz + 2); }

GlobalFilters LastPrintDate PageInSection SectionNumber Data Provider Connection DataProvider DataProviderSQL DataProviderType LastExecutionDate LastExecutionTime NumberOfDataProviders NumberOfRows OlapQueryDescription SourceName UniverseName UserResponse Miscellaneous Application Value ColumnNumber CurrentUser GetContentLocale GetLocale GetProfileNumber GetProfileString If LineNumber MultiCube NameOf NoFilter NumberOfPages Page Previous RowIndex UniqueNameOf

48881 48881 48881 48881 48881

Notice that it first checks if v is null If it is, then it returns a new ThreeD object in which all fields are set to zero The reason for this is that v is set to default(T) by the ByTwos constructor This value is zero for value types and null for object types Thus, (unless SetStart( ) has been called) for the first increment, v will contain null instead of a reference to an object This means that for the first increment, a new object is required A type parameter for a generic interface can have constraints in the same way as it can for a generic class For example, this version of ISeries restricts its use to reference types:

public interface ISeries<T> where T : class {

X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X

46 47 48 49 50

When this version of ISeries is implemented, the implementing class must also specify the same constraint for T, as shown here:

class ByTwos<T> : ISeries<T> where T : class {

TABLE 22-1 Comparison of Formula Functions in Various Product Versions (continued)

21 22 23 24 25

Because of the reference constraint, this version of ISeries cannot be used on value types Thus, in the preceding program, only ByTwos<ThreeD> would be valid ByTwos<int> and ByTwos<double> would be invalid

Sometimes you will want to compare two instances of a type parameter For example, you might want to write a generic method called IsIn( ) that returns true if some value is contained within an array To accomplish this, you might first try something like this:

Part III:

// This won t work! public static bool IsIn<T>(T what, T[] obs) { foreach(T v in obs) if(v == what) // Error!

004321 004864 005445 006061 006706

18:

A formula may contain any combination of universe object variables, user-defined report variables, functions, operators, calculation contexts, and numeric and string constants Formulas can vary in complexity from basic calculations formulas containing only universe object variables, basic operators and constants to very advanced formulas using complex combinations of if-then-else logic, Boolean logic, other user-defined variables, and built-in functions that Web Intelligence provides Formulas can perform calculations on any type of data, including numeric, string, date, time, and Boolean Table 22-2 provides some samples of each type of formula

return true; return false;

06334 06741 07149 07556 07963