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Generics in C# and the CLR differ from similar constructs in other languages Although other languages provide similar functionality, C# is significantly more type-safe Generics in C# are a language feature and a platform feature the underlying 20 runtime contains deep support for generics in its engine C++ templates differ significantly from C# generics, because C# takes advantage of the CIL C# generics are compiled into the CIL, causing specialization to occur at execution time for each value type only when it is used, and only once for reference types A distinct feature not supported by C++ templates is explicit constraints C++ templates allow you to compile a method call that may or may not belong to the type parameter As a result, if the member does not exist in the type parameter, an error occurs, likely with a cryptic error message and referring to an unexpected location in the source code However, the advantage of the C++ implementation is that operators (+, -, and so on) may be called on the type C# does not support the calling of operators on the type parameter because operators are static they can t be identified by interfaces or base class constraints The problem with the error is that it occurs only when using the template, not when defining it Because C# generics can declare constraints, the compiler can prevent such errors when defining the generic, thereby identifying invalid assumptions sooner Furthermore, when declaring a variable of a generic type, the error will point to the declaration of the variable, not to the location in the generic implementation where the member is used It is interesting to note that Microsoft s CLI support in C++ includes both generics and C++ templates because of the distinct characteristics of each

The I/O class library This contains classes which provide facilities for low-level input/output,

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Interface Constraints In order to satisfy the sort requirement, you need to use the CompareTo() method in the BinaryTree class To do this most effectively, you impose a constraint on the T type parameter You need the T type parameter to

public class BinaryTree<T> where T: SystemIComparable<T> { public Pair<BinaryTree<T>> SubItems { get{ return _SubItems; } set { IComparable<T> first; // Notice that the cast can now be eliminated first = valueFirstItem; if (firstCompareTo(valueSecondItem) < 0) { // first is less than second } else { // second is less than or equal to first } _SubItems = value; } } private Pair<BinaryTree<T>> _SubItems; }

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Just as you can use reflection on nongeneric types, the 20 framework has provisions for reflecting on generic types Runtime reflection on generics determines whether a class or method contains a generic type, and any type parameters or arguments it may contain

Given the interface constraint addition in Listing 1122, the compiler ensures that each time you use the BinaryTree class you specify a type parameter that implements the IComparable<T> interface Furthermore, you no longer need to explicitly cast the variable to an IComparable<T> interface before calling the CompareTo() method Casting is not even required to access members that use explicit interface implementation, which in other contexts would hide the member without a cast To resolve what member to call, the compiler first checks class members directly, and then looks at the explicit interface members If no constraint resolves the argument, only members of object are allowable

If you tried to create a BinaryTree<T> variable using System TextStringBuilder as the type parameter, you would receive a compiler error because StringBuilder does not implement IComparable<T> The error is similar to the one shown in Output 113

In the same way that you can use a typeof operator with nongeneric types to retrieve an instance of SystemType, you can use the typeof operator on type parameters in a generic type or generic method Listing 144 applies the typeof operator to the type parameter in the Add method of a Stack class

OUTPUT 113:

public class Stack<T> { public void Add(T i) { Type t = typeof(T); } }

error CS0309: The type SystemTextStringBuilder must be convertible to SystemIComparable<T> in order to use it as parameter T in the generic type or method BinaryTree<T>

To specify an interface for the constraint you declare an interface constraint This constraint even circumvents the need to cast in order to call an explicit interface member implementation

Once you have an instance of the Type object for the type parameter, you may then use reflection on the type parameter itself to determine its behavior and tailor the Add method to the specific type more effectively

Another window toolkit class library This contains all the classes needed for the interaction between an applet and the user It contains classes for basic HCI components such as fonts, colours, events, buttons and scroll bars This library is used in 7

Base Class Constraints Sometimes you might want to limit the constructed type to a particular class derivation You do this using a base class constraint, as shown in Listing 1123

In the SystemType class for CLI 20, a handful of new methods determine whether a given type supports generic parameters and arguments A generic argument is a type parameter supplied when a generic class is instantiated You can determine whether a class or method contains generic parameters that have not yet been set by querying the TypeContainsGenericParameters Boolean property, as demonstrated in Listing 145

public class EntityDictionary<TKey, TValue> : SystemCollectionsGenericDictionary<TKey, TValue> where TValue : EntityBase { }

In contrast to SystemCollectionsGenericDictionary<TKey, TValue> on its own, EntityDictionary<TKey, TValue> requires that all TValue types derive from the EntityBase class By requiring the derivation, it is possible to always perform a cast operation within the generic implementation, because the constraint will ensure that all type parameters derive from the base and, therefore, that all TValue type parameters used with EntityDictionary can be implicitly converted to the base The syntax for the base class constraint is the same as that for the interface constraint, except that base class constraints must appear first when multiple constraints are specified However, unlike interface constraints,

using System; public class Program { static void Main() { Type type; type = typeof(SystemNullable<>); ConsoleWriteLine(typeContainsGenericParameters); ConsoleWriteLine(typeIsGenericType); type = typeof(SystemNullable<DateTime>); ConsoleWriteLine(!typeContainsGenericParameters); ConsoleWriteLine(typeIsGenericType); } }

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