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Extend collections

, 11 Dec 1999
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Extended Collection classes to provide copy, compare and find operations with 2 dimensional arrays and maps
  • Download demo project - 24 Kb
  • Download source files - 10 Kb
  • Sample Image - ExtCol.gif

    <!-- Article Starts --> This article describes three enhanced collection template classes, CArrayEx, CMapEx and CSortedArray. CArrayEx and CMapEx each provide an assignment operator and class copy constructor that allow us to easily craft two dimensional arrays and mappings. In addition, CMapEx provides the ability to map CStrings, by providing a template hash function. CSortedArray is a dynamic array template class that provides "sort after insertion" functionality.
      // example of 2 dimensional array
      typedef CArrayEx<int,int> CIntArray;
      CArrayEx<CIntArray, CIntArray &> a2D;
      CIntArray aInt;
      a2D.Add (aInt);    

    In a lot of cases we need an array with a find function. We can use a sorted array for this.

    To work with arrays of pointers you should use the functions DestructElements, CopyElements as described in the MSDN article 'Collections: How to Make a Type-Safe Collection'], but there exists an alternative way by using auto_ptr:

    // auto_ptr example.
    CArray<auto_ptr<CValue>,auto_ptr<CValue> > a;
    CArray<auto_ptr<CValue>,auto_ptr<CValue> > b;
    a.Add(auto_ptr<CValue>(new CValue(1)));
    a.Add(auto_ptr<CValue>(new CMyValue(2)));
    b.Add(auto_ptr<CValue>(new CValue(3)));
    b.Add(auto_ptr<CValue>(new CMyValue(4)));
    // TRACE(_T("Copy\n"));
    // a.Copy(b);
    TRACE(_T("Remove all\n"));

    The classes provided with this article are as follows:

    Adds Copy constructor, assign operator and Array compare operators
    Adds Copy constructor, assign operator and a method "GetAt" by index. Also adds Hash functions for CString
    Adds Copy constructor and assign operator
    Adds Copy constructor, assign operator and Array compare operators. Also adds Sorting methods by operators or compare functions


    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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    About the Author

    Audrius Vasiliauskas
    Business Analyst
    Lithuania Lithuania
    No Biography provided

    Comments and Discussions

    GeneralLicense Rights PinmemberJohn McNeill2-Dec-10 7:31 
    GeneralRe: License Rights PinmemberAudrius Vasiliauskas2-Dec-10 8:15 
    GeneralRe: License Rights PinmemberJohn McNeill2-Dec-10 8:17 
    Generallicense Pinmemberyhing24-Aug-09 7:51 
    GeneralRe: license PinmemberAudrius Vasiliauskas24-Aug-09 22:56 
    GeneralProblem with unicode Pinmemberbitkidoku13-Dec-06 3:04 
    GeneralVC 7.1 error C2679 PinmemberHobbitCoder25-Oct-05 14:50 
    General.NET Pinmemberdavedrums7-Sep-04 5:01 
    GeneralRe: .NET PinmemberAudrius Vasiliauskas13-Sep-04 1:37 
    GeneralRemoveAt PinmemberPhilTordoff18-Mar-03 5:12 
    GeneralRe: RemoveAt PinmemberAudrius Vasiliauskas18-Mar-03 5:28 
    QuestionSetSize missing? PinmemberAnonymous9-May-01 3:20 

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