delete partial memory of the pointer

Question

Is there any way i can delete the partial memory of the pointer.? for example

char *c = new char[1000];
sprintf(c,"this is it");

As it can be seen a lot of memory is getting wasted here. can I free the memory more than the required.?

Short answer: No. Why not just use `std::string`? If you really need to, you can use `malloc()` and `realloc()`. — Mysticial, Aug 19 '12 at 00:08

score 1 · Answer 1 · answered Aug 19 '12 at 00:08

1

Not directly. The best you can do in C++ is to make a new copy that's the right size and delete the old one. There's no analog of C's realloc.

answered Aug 19 '12 at 00:08

Pete Becker

74,985
8
76
165

score 0 · Answer 2 · answered Aug 19 '12 at 00:12

0

Unless your system is a RAM-restricted embedded system, why bother? Just use ginormous buffers and include a 'dataLen' int.

answered Aug 19 '12 at 00:12

Martin James

24,453
3
36
60

score 0 · Answer 3 · answered Aug 19 '12 at 00:33

0

Well, allocate another memory block with the precise size required for the data, copy the data there and free the original (exceedingly large) memory block. Done.

answered Aug 19 '12 at 00:33

AnT stands with Russia

312,472
42
525
765

delete partial memory of the pointer

3 Answers3