the simple memory alloc and free problem

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C++

<pre>//allloc the memory
int * lastBuffer = new int[1<<m_exp];

//free the memroy by std::free()
std::free(lastBuffer );

the free method is OK? if not ,what's the problem?

Or more info?

Posted 11-Jul-13 20:13pm

jiazhiqiang

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2 solutions

Solution 1

NEVER EVER mismatch the "alloaction pairs"

new <-> delete
alloc <-> free

Make a poster and hang it above your bed ;-)

Posted 11-Jul-13 20:39pm

KarstenK

Comments

nv3 12-Jul-13 3:03am

In this case it's even "delete []". My 5.

H.Brydon 12-Jul-13 15:35pm

Right, you almost said it but didn't:

new < - > delete
new[] < - > delete []
alloc() < - > free()

KarstenK 15-Jul-13 2:14am

"You got it" ;-)

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«_Superman_» · Accepted Answer · 2013-07-11T20:39:00

Solution 2

If you use malloc to allocate memory, use free to deallocate it.
If you use new to allocate memory, use delete to deallocate it.
Never mix them together.

Read what the man himself has to say - http://www.stroustrup.com/bs_faq2.html#malloc[^]

Posted 11-Jul-13 20:39pm

«_Superman_»

Comments

H.Brydon 12-Jul-13 15:36pm

As per solution #1, new goes with delete, new[] goes with delete[]...
+5 anyhow...