Two Dimensional TInt Array in Symbian(二维数组)

Two Dimensional TInt Array in Symbian

From Forum Nokia Wiki

The implementation below shows the creation to two dimensional integer array in symbian. The diagrammatic structure of implementation is given below for clear explanation.

 

Header File

#ifndef __TWODIMENSIONAL_H__
#define __TWODIMENSIONAL_H__
 
#include <e32std.h>
 
typedef RArray<TInt> RIntegerArray;
 
class R2DIntArray: public RPointerArray <RIntegerArray>
{
public:
    ~R2DIntArray();
    void ResetAndDestroy();
    inline TInt& At(TInt a1, TInt a2) { return (*((*this)[a1]))[a2]; }
            TInt Find(TInt aInteger);
            void Add(TInt aInteger);
 
            void AppendLast(TInt aPosition, TInt aValue);
 
};
#endif

 

Functions Implementation

// destructor
R2DIntArray::~R2DIntArray()
            {
            ResetAndDestroy();
            };
 
void R2DIntArray::ResetAndDestroy()
            {
            for (TInt i=0; i<Count(); i++)
 
            {
 
                        (*this)[i]->Reset();
 
            }
            RPointerArray<RIntegerArray>::ResetAndDestroy();
            };
 
 
 
// Finding the particular  integer value
 
TInt R2DIntArray::Find(TInt aInteger)
            {
            for (TInt i=0; i<Count(); i++)
                        if (aInteger == (*((*this)[i]))[0])
                                    return i;
            return KErrNotFound;
            }
 
 
// adding the entry
void R2DIntArray::Add(TInt aInteger)
            {
            Append(new RIntegerArray);
            (*this)[Count() - 1]->Append(aInteger);
            }
 
// Appending the entry
 
void R2DIntArray::AppendLast(TInt aPosition, TInt aValue)
            {
            (*this)[aPosition]->Append(aValue);
            }

 

Two Dimensional Array Usage

R2DIntArray 2DArray;
2DArray.Reset();
2DArray.At(j,0)
2DArray.At(j,1)
2DArray.Count()
 
TInt j= 0 ; // value less than count of array.
TInt word = 25 // Any integer value.
 
RPointerArray<R2DIntArray> 2DPtrArray;
2DPtrArray.Append(new R2DIntArray);
2DPtrArray[0]->At(j,1); // refer to diagram  above for clear understanting
TInt retWord = 2DPtrArray[0]->Find(word);
if(retWord != KErrNotFound)
{
   // you got the  index of the  searched word
}

 

• RPointerArray<R2DIntArray> 2DPtrArray

( j ) -> ( 0 )( 1 )

[ 0 ] -> [ 0 ][20]

[ 1 ] -> [ 1 ][25]

[ 2 ] -> [ 2 ][35]

[ 3 ] -> [ 3 ][45]

 

• R2DIntArray 2DArray

( 0 )( 1 )

[ 0 ][20]

[ 1 ][25]

[ 2 ][35]

[ 3 ][45]

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