IEnumerable

Assembly: Collections;

Description

IEnumerable - abstract interface of collections supporting element search.

Inheritance Hierarchy

IEnumerable

Comments

The interface does not contain its own properties and methods. Interface internal implementation enables the user to work with collections using the For Each operator.

NOTE. Inheritance from IEnumerable is not a mandatory condition to support For Each. For some collections existing in Fore their own support of the For Each operator is implemented.

Example

Below is the example of the IEnumerable interface that is used to create a universal procedure to view any collections inherited from IEnumerable.

Sub UserProc;
    Sub ShowCollection(Collection: IEnumerable);
    Var
        v: Variant;
    Begin
        For Each v In Collection Do
            Debug.WriteLine(v);
        End For;
    End Sub ShowCollection;
Var
    ArrList: IArrayList;
    StrList: IStringList;
Begin
    //Create and fill a dynamic array of any values
    ArrList := New ArrayList.Create;
    ArrList.Add("A");
    ArrList.Add(Integer.MaxValue);
    ArrList.Add(DateTime.MaxValue);
    //Create and fill a dynamic array of strings
    StrList := New StringList.Create;
    StrList.Add("One");
    StrList.Add("Two");
    StrList.Add("Three");
    //View collections
    ShowCollection(ArrList);
    ShowCollection(StrList);
End Sub UserProc;