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allocating memory

Started by tHiSiSbOb Jul 13, 2003 at 3:42 PM 3 replies 350+ views

Original Post

111

Jul 13, 2003 at 3:42 PM

I want to be able to declare several blocks of memory that are right next to each other, one a block of ints, another a block of floats, and another a block of chars-lets just say. Is there anyway to do this using something like malloc? If so, how. If not, how do I do this? Pleas don''t tell me I should use structures because I know that in the long run this will not work out for my applications. Thank you in advance.

T2k

Jul 13, 2003 at 3:53 PM

something like:

void *totalmem= malloc(sizeof(int)*intamount+ sizeof(float)* floatamount);
int *urints= (int *) totalmem;
float *urfloats= (float *)(totalmem + sizeof(int)*intamount);

got it?

T2k

tHiSiSbOb

Author

111

tHiSiSbOb

Jul 13, 2003 at 6:32 PM

ok, I tried that but when I am trying to set the float pointer to by adding the amount of space taken by the integers to the pointer oto the memory, I get a compiler error that read "''void*'':unknown size".

tHiSiSbOb

Author

111

tHiSiSbOb

Jul 13, 2003 at 6:40 PM

Ok, nevermind, I figured it out. I should have given it more thought before posting again.

Trienco

146

Trienco

Jul 14, 2003 at 3:06 AM

i assume you want to do that in plain c?

void *mymem= malloc(lots_of_memory);
void *nextfree=mymem;

int* ints=(int*)nextfree;
nextfree= (int*)nextfree + num_ints;
float* floats=(float*)nextfree;
nextfree= (float*)nextfree + num_floats;

but thats very limited and you cant free any of the smaller blocks. with a little more work you could do your own memory management.

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