Free some values from memory located in the middle of a Dynamic array.

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I've got a dynamically allocated array of type int called data. I allocated it with 3 ints, and assigned them some values as below.
Code :

C++

int * data = (int *) malloc(sizeof(int) * 3); //Now there are 3 elements in the array 'data'.

//Assigning values
data[0] = 1;
data[1] = 2;
data[2] = 3;

Problem :
Now, I want to delete data[1], free it, then join the other 2 parts of array (data[0] and [data2]) and finally get a pointer to the new array.

Posted 27-Dec-12 7:55am

Captain Price

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André Kraak · Answer 1 · 2012-12-27T08:02:00

Solution 1

One way to do it is:

C++

int * newData = (int *) malloc(sizeof(int) * 2);

newData[0] = data[0];
newData[1] = data[2];

free( data );

data = newData;
newData = null;

Posted 27-Dec-12 8:02am

André Kraak

Comments

Captain Price 27-Dec-12 14:21pm

Thks, Will this work fine without leaks ?

André Kraak 27-Dec-12 14:27pm

Yes, just remember that at the end you still need to use free( data );

Captain Price 27-Dec-12 15:18pm

can't use data=newData. But 'memcpy' works fine !

Mohibur Rashid 27-Dec-12 21:43pm

in that case you still would have memory problem. memcpy might work but it would lead you to corrupted data.

and data=newData must have to work, make sure both of your data and newData are (int *)