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(Some authors call these rigid variables because their values do not change throughout the execution of the program Some authors call them auxiliary variables) It is worthwhile giving another illustration of the use of ghost variables Suppose we want to specify that the sum of two variables i and j should remain constant For example, i and j may be initially zero The requirement is then that, on termination, i+j should also be zero If, however, i and j are initially 1 and 2, we require that i+j is 3 on termination of the program We specify this by introducing a ghost variable C This variable should not be used anywhere else in the program Then the program S is specified by.



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// // // //

ERROR: The type 'T' must be convertible to 'SystemIComparable<T>' in order to use it as parameter 'T' in the generic type or method

This says that if the sum of i and j has the value C before execution of statement S, execution of statement S is guaranteed to terminate in a state in which the sum of i and j still has the value C. In summary, we specify a program S by supplying a precondition P and a postcondition Q and requiring that S be constructed to satisfy {P}S{Q} . In addition, we (informally) specify the input variables and the output variables of the program and their types. Ghost variables may be used to link the precondition to the postcondition. Ghost variables are treated just like ordinary program

// class Entity<T> : EntityBase<T> // { // // }





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This leads to another draft of the domain model in Figure 11-6 While drafting the model, we decide the domain class name IssueCategory will be more explanatory than Category

Because EntityBase requires that T implement IComparable<T>, the Entity class needs to explicitly include the same constraint Failure to do so will result in a compile error This increases a programmer s awareness of the constraint in the derived class, avoiding confusion when using the derived class and discovering the constraint but not understanding where it comes from In contrast, constraints on generic override (or explicit interface) methods are inherited implicitly and may not be restated (see Listing 1128)

variables but the program code may not refer to them in any way. To distinguish ghost variables from normal program variables we use a sans serif type. Finally, we sometimes impose limitations on the primitives that may be used in the implementation of the specification. These limitations are stated informally.

class EntityBase<T> where T : IComparable<T> { public virtual void Method<T>(T t) where T : IComparable<T> { // } }

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Notice how, in the snapshots, we consider objects and relationships outside the scope of the domain model we end up with here, the instance issues and eld values They are about the meaning of the DSL in this case, how a model in the language de nes structures and constraints to which the eld values must conform Considering context in the snapshots is most important for understanding the language

class Entity<T> : EntityBase<T> { public virtual void Method<T>(T t) // Error: Constraints may not be // repeated on overriding members where T : IComparable<T> { // } }

The very simplest specifications can be met by assignment statements. An assignment statement has the form

In the inheritance case the type parameter on the base class can be additionally constrained by adding not only the constraints on the base class (required), but also additional constraints as well However, overriding members need to conform to the interface defined in the base class method Additional constraints could break polymorphism, so they are not allowed and the type parameter constraints on the override method are implied

Range (Inclusive)

One last improvement can be made to this model We have chosen the multiplicities on each role to t the situations depicted in the example snapshots But there is also another restriction From the snapshot, you can see that an IssueCategory can belong to a Project or it can be a subcategory of another IssueCategory Trying out variations on this snapshot would soon reveal that it cannot both belong to a project and be a subcategory, and would also raise the question of whether it could belong to two projects or be subcategories of different categories Assuming that none of these situations is allowed, we

x := e ,

7 15 16

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