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Tip of the Day
Language: C++
Expertise: Beginner
Dec 23, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Iostream Objects' Memory Use

Question:
I have written this very small program in Microsoft Visual C++ and it seems that STL is dumping memory:
 
#include 
#include 

using namespace std ;

void main()
{
  _CrtDumpMemoryLeaks( );
}
The output is a memory dump of 33 bytes and 40 bytes. How can this be?

Answer:
_CrtDumpMemoryLeaks( ) lies. The iostream objects are constructed before main() starts and they are destructed after main() exits. Therefore, _CrtDumpMemoryLeaks() thinks that there's a memory leak, because the memory isn't released when by the time main() exits. Instead, it is released afterwards, during the destruction of the iostream objects.

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