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KwickClips C++ · 40 sec · free

Does a leak give an error?

Short answer. No.

How do you avoid it?

Free before every return.

Memory leak

malloc a block
Return without free
Address lost, block stuck

Remember

Free before every return
Leaks add up over time

This bug gives no error, yet it can crash a server. It is a memory leak. A function mallocs a block. It returns without free. The address is lost, and the block stays stuck. Remember this. Free before every return. Leaks add up.

This clip is from the full lesson: Dynamic Memory Allocation: malloc, calloc, realloc and free — 6 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: Programming All levels C

More KwickClips from this lesson

Table comparing stack and heap: holds, freed by, size.Who frees heap memory?43 secTable comparing malloc and calloc: arguments, starting values, failure.Which one gives zeros?43 secSlide: realloc keeps old values, save result in a new pointer, free each block once.Why use a new pointer for realloc?42 sec
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