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POImplementing GetEnumerator in C++
 

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    <p>In C# i have the following class and it compiles just fine:</p> <p><code> class CustomItem { }</p> <pre><code>class CustomList : IList&lt;CustomItem&gt; { public CustomItem this[int index] { get { return null; } set { throw new NotImplementedException(); } } public void CopyTo(CustomItem[] array, int arrayIndex) { } public int Count { get { return 10; } } public int IndexOf(CustomItem item) { throw new NotImplementedException(); } public void Insert(int index, CustomItem item) { throw new NotImplementedException(); } public void RemoveAt(int index) { throw new NotImplementedException(); } public void Add(CustomItem item) { throw new NotImplementedException(); } public void Clear() { throw new NotImplementedException(); } public bool Contains(CustomItem item) { throw new NotImplementedException(); } public bool IsReadOnly { get { return true; } } public bool Remove(CustomItem item) { throw new NotImplementedException(); } public IEnumerator&lt;CustomItem&gt; GetEnumerator() { throw new NotImplementedException(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { throw new NotImplementedException(); } } </code></pre> <p></code></p> <p>When i try the same in C++ i get several compiler errors:</p> <p><code> ref class CustomItemValue { };</p> <pre><code>typedef CustomItemValue^ CustomItem; ref class CustomList : public IList&lt;CustomItem&gt; { public: property CustomItem default[int] { virtual CustomItem get(int index) { return nullptr; } virtual void set(int index, CustomItem value) {} } virtual void CopyTo(array&lt;CustomItem&gt;^ array, int arrayIndex) { } property int Count { virtual int get() { return 10; } } virtual int IndexOf(CustomItem item) { throw gcnew NotImplementedException(); } virtual void Insert(int index, CustomItem item) { throw gcnew NotImplementedException(); } virtual void RemoveAt(int index) { throw gcnew NotImplementedException(); } virtual void Add(CustomItem item) { throw gcnew NotImplementedException(); } virtual void Clear() { throw new NotImplementedException(); } virtual bool Contains(CustomItem item) { throw gcnew NotImplementedException(); } property bool IsReadOnly { virtual bool get() { return true; } } virtual bool Remove(CustomItem item) { throw gcnew NotImplementedException(); } virtual IEnumerator&lt;CustomItem&gt;^ GetEnumerator() { throw gcnew NotImplementedException(); } virtual System::Collections::IEnumerator^ GetEnumerator() { throw gcnew NotImplementedException(); } }; </code></pre> <p></code></p> <p>The error messages from the compiler are:</p> <p><code> .\mc.cpp(38) : error C2556: 'System::Collections::IEnumerator ^CustomList::GetEnumerator(void)' : overloaded function differs only by return type from 'System::Collections::Generic::IEnumerator ^CustomList::GetEnumerator(void)' with [ T=CustomItem ] .\mc.cpp(36) : see declaration of 'CustomList::GetEnumerator' .\mc.cpp(38) : error C2371: 'CustomList::GetEnumerator' : redefinition; different basic types .\mc.cpp(36) : see declaration of 'CustomList::GetEnumerator' </code></p> <p>Can anyone help me with this?</p>
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    1. USAndreas Roth
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    1. COI wonder if you couldn't just inherit from Collection<CustomItem>, and just use overrides for the specific methods you want to change?
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      1. USMarc Gravell
    2. COSorry, but i did not find a class Collection<T> in .NET. As far as i know List<T> or Array<T> exists, but that's not exactly what i want. Thanks for your suggestion but i need this to access an existing list implementation in .NET. The list is implemented in C++ and i want to access it.
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      1. USAndreas Roth
 

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