Visual C++ .NET/Collections/IEnumerator

Display elements in a multiset by IEnumerator<> interface

 
#include "stdafx.h"
#include <cliext/set>
using namespace System;
using namespace cliext;
using namespace System::Collections::Generic;
ref class MyClass{
public:
    String^ Name;
    MyClass() : Name(String::Empty) { }
    MyClass(String^ name) : Name(name) { }
    MyClass(const MyClass% orig){
        Name = orig.Name; 
    }
    MyClass% operator=(const MyClass% orig){
        if (this != %orig)
            Name = orig.Name;
        return *this;
    }
    ~MyClass() { }
    bool operator<(const MyClass^ rhs){
        return (Name->CompareTo(rhs->Name) < 0);
    }
    bool operator==(const MyClass^ rhs){
        return (Name->Equals(rhs->Name));
    }
};
int main(array<System::String ^> ^args)
{
    multiset<MyClass^> mpets; 
    mpets.insert(gcnew MyClass("King")); 
    mpets.insert(gcnew MyClass("Buster"));
    mpets.insert(mpets.end(), gcnew MyClass("Zipper"));
    mpets.insert(gcnew MyClass("N"));
    multiset<MyClass^>::iterator New_Puppy = mpets.insert(gcnew MyClass("N"));

    for each (MyClass^ pet in mpets) 
        System::Console::Write("{0} ", pet->Name); 
    return (0);
}

Get key and value Enumerator

 
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void main()
{
    ListDictionary ^ldict = gcnew ListDictionary();
    ldict->Add("A", "First");
    ldict->Add("B", "Second");
    ldict->Add("C", "Third");
    ldict["D"] = "Fourth";
    
    IEnumerator ^keys = ldict->Keys->GetEnumerator();
    IEnumerator ^vals = ldict->Values->GetEnumerator();
    while ( keys->MoveNext() && vals->MoveNext())
    {
        Console::WriteLine("{0}\t\t{1}", keys->Current, vals->Current);
    }
}

Push pets onto stack and display by IEnumerator<> interface

 #include "stdafx.h"
#include <cliext/stack>
using namespace System;
using namespace cliext;
using namespace System::Collections::Generic;
ref class MyClass
{
public:
    String^ Name;
    MyClass() : Name(String::Empty) { }
    MyClass(String^ name) : Name(name) { }
    MyClass(const MyClass% orig){
        Name = orig.Name; 
    }
    MyClass% operator=(const MyClass% orig){
        if (this != %orig)
            Name = orig.Name;
        return *this;
    }
    ~MyClass() { }
    bool operator<(const MyClass^ rhs){
        return (Name->CompareTo(rhs->Name) < 0);
    }
    bool operator==(const MyClass^ rhs){
        return (Name->Equals(rhs->Name));
    }
};
int main(array<System::String ^> ^args){
    stack<MyClass^> pets;
    pets.push(gcnew MyClass("A"));
    pets.push(gcnew MyClass("B"));
    pets.push(gcnew MyClass("C"));
    pets.push(gcnew MyClass("D"));
    for each (MyClass^ pet in pets.get_container())
        Console::Write("{0} ", pet->Name);
    return 0;
}

Use while loop and Enumerator to loop through an array

 
#include "stdafx.h"
using namespace System;
using namespace System::Collections;
void main()
{
    array<int>^ IntList = gcnew array<int> { 1, 2, 3, 4, 5 };
    IEnumerable ^collection = (IEnumerable^)IntList;
    IEnumerator ^enumerator = collection->GetEnumerator();
    while (enumerator->MoveNext())
    {
        int i = (int)enumerator->Current;
        Console::WriteLine(i);
    }
    for each (int i in IntList)
        Console::WriteLine(i);
}

Using IEnumerator to loop through an array

 
#include "stdafx.h"
using namespace System;
using namespace System::Collections;
int main()
{
   array<DateTime^>^ dateArray = gcnew array<DateTime^>(2);
   dateArray[0] = gcnew DateTime(1970, 12, 18);
   dateArray[1] = gcnew DateTime(1990, 1, 5);
   IEnumerator^ enumerator1 = dateArray->GetEnumerator();
   while ( enumerator1->MoveNext() )
   {
      DateTime^ current = (DateTime^) enumerator1->Current;
      Console::WriteLine( current->ToString("MM/dd/yyyy") );
   }
}

vector for each loop using built in IEnumerator<> interface

 
#include "stdafx.h"
#include <cliext/vector>
#include <cliext/adapter>
using namespace System;
using namespace cliext;
using namespace System::Collections::Generic;
ref class MyClass{
public:
    String^ Name;
    MyClass() : Name(String::Empty) { }
    MyClass(String^ name) : Name(name) { }
    MyClass(const MyClass% orig){
        Name = orig.Name; 
    }
    MyClass% operator=(const MyClass% orig){
        if (this != %orig)
            Name = orig.Name;
        return *this;
    }
    ~MyClass() { }
    bool operator<(const MyClass^ rhs){
        return (Name->CompareTo(rhs->Name) < 0);
    }
    bool operator==(const MyClass^ rhs){
        return (Name->Equals(rhs->Name));
    }
};

int main(array<System::String ^> ^args)
{
    vector<MyClass^> pets; 
    pets.push_back(gcnew MyClass("A")); 
    pets.push_back(gcnew MyClass("B"));
    pets.push_back(gcnew MyClass("C"));
    pets.push_back(gcnew MyClass("D"));
    for each (MyClass^ pet in pets) 
        System::Console::Write("{0} ", pet->Name); 
    return (0); 
}