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allocating to a dynamic array

Started by Basiror Apr 15, 2002 at 12:19 PM 2 replies 200+ views

Original Post

140

Apr 15, 2002 at 12:19 PM

hello i just wondered if it is possible to allocate another particle to my dynamic array i have something like this list *pList=NULL pList=(list*)malloc(arraysize*sizeof(list)); so i have an array of pList[0]->pList[arraysize-1]; how can i add another arrayelement to pList that way? oldarraysize=arraysize; arraysize++; pList[arraysize-1]=(list*)malloc(sizeof(list)); so i have one more element would this work or do i have to set the ammount of elements i need when i allocate the memory at the start up? thx for helping

krikkit

Apr 15, 2002 at 12:23 PM

If you need to have dynamic lists, use the STL.
Arrays, in and of themselves, have to be re-declared, re-allocated and copied if you want to size them. Coulda sworn this topic was active somewhere else on-site...

dalleboy

Apr 15, 2002 at 12:29 PM

Or you could use realloc.

list *pList=NULL
size_t arraysize = 5;

pList = (list*) malloc(arraysize * sizeof(list));

pList is now containing 5 elements:
pList[0] ... pList[4];

arraysize = 10;
pList = (list*) realloc(pList, arraysize * sizeof(list));

pList is now containing 10 elements:
pList[0] ... pList[9];

Though I prefer STL, but STL are written in C++.

[edited by - dalleboy on April 15, 2002 1:32:04 PM]

Basiror

Author

140

Basiror

Apr 15, 2002 at 12:34 PM

thx for the quick reply i will use the realloc i prefer the old c++ functions
i don t want to switch my c++ style within one project to keep it readable

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