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For example, as a customer, I might decide that I don t need multiple projects, but I do need multiple users, although access control is not required I ll have an audit trail, but must accept that because I haven t chosen access control I can t restrict the audit trail to managers The tree notionally includes every feature in the requirements document; some of them may turn out not to be optional after all After some discussion, CJKW decides that Multiple Projects is a non-optional feature of every installation; this saves development effort, and in practice loses little exibility customers who want single list of issues need only create one project Development tasks can be mapped to the nodes in the tree that they enable Development effort is required both for features and optional or XOR nodes One task links each issue to a milestone, but more effort is required to make that optional per installation, and yet more is needed to make it optional per project A feature tree is about requirements, rather than design; each feature describes something that can be seen by the client of the system In their rst few customer-speci c systems, CJKW s design choices evolved somewhat as the team gained experience Many of the variations are about changes in design choices rather than changes in requirements for example, using a list instead of an array at some point These changes are not included in the feature tree Choices may be marked with how often or in what context they may vary for example, Single/Multiple User select on Installation; Custom Fields select per issue type or project; Multiple Types of Issue per Project currently xed at false Each project de nes a single type of issue Feature trees are not only for features visible to end users If you are designing something like a generic wizard builder, then your clients are the developers who call your subsystem, and your features are the behavior visible to them at your API.

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A Hoare triple thus denotes a boolean value; if the value is true, we say the triple is valid, and, if it is false, we say the triple is invalid..

This interface represents pairs of like objects, such as the coordinates of a point, a person s genetic parents, or nodes of a binary tree The type contained in the pair is the same for both items To implement the interface, you use the same syntax as you would for a nongeneric class However, implementing a generic interface without identifying the type parameter forces the class to be a generic class, as shown in Listing 119 In addition, this example uses a struct rather than a class, indicating that C# supports custom generic value types

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public struct Pair<T>: IPair<T> { public T First { get { return _First; } set { _First = value; } } private T _First; public T Second { get { return _Second;

1 Important warning to C/Java programmers: the equality symbol '=' really means equality here and not assignment.

Feature Trees and DSLs Feature trees work well for binary or enumerated choices A feature tree can work more or less directly as a DSL clothed in a suitable syntax Many installers have feature trees that appear either in the form of expandable trees of checked options or as wizards

} set { _Second = value; } } private T _Second; }

Support for generic interfaces is especially important for collection classes, where generics are most prevalent Without generics, developers relied on a series of interfaces within the SystemCollections namespace Like their implementing classes, these interfaces worked only with type object, and as a result, the interface forced all access to and from these collection classes to require a cast By using generic interfaces, you can avoid cast operations, because a stronger compile-time binding can be achieved with parameterized interfaces

The following are examples of valid Hoare triples:

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ADVANCED TOPIC Implementing the Same Interface Multiple Times on a Single Class One side effect of template interfaces is that you can implement the same interface many times using different type parameters Consider the IContainer<T> example in Listing 1110

But some variabilities are more complex structures that cannot simply be selected or deselected Inspecting its feature tree, CJKW s developers identify that where customers opt for Sequence of states constrained to a given sequence and custom elds de nable per project, the users will need suitable notations for de ning the detail of these choices This is the origin of the two DSLs used in the project

public interface IContainer<T> { ICollection<T> Items { get; set; } } public class Person: IContainer<Address>, IContainer<Phone>, IContainer<Email> { ICollection<Address> IContainer<Address>Items { get{} set{}

{ t r u e } i := 1 {i = l } . Note the use of the precondition true in the final example. A true precondition describes all states of the program variables; the claim is thus that whatever the initial value of the program variables (in particular the variable i) after execution of the assignment i := 1 the property i = 1 will hold. The following are examples of invalid Hoare triples:

} ICollection<Phone> IContainer<Phone>Items { get{} set{} } ICollection<Email> IContainer<Email>Items { get{} set{} } }

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