RE: [boost] enabling automatic memory leak detection with VC

From: Max Khesin (MKhesin_at_[hidden])
Date: 2004-05-20 14:14:13

I also used this idom, it is very nice. One thing to watch out for is 'false
positives' from other global/static objects that do mallocs. 

leak_reporter leak_reporter::instance;
std::string i_will_trigger_leak_report;

I am not aware of any automatic way to avoid this.
m
> -----Original Message-----
> From: Robert Ramey [mailto:ramey_at_[hidden]]
> Sent: Thursday, May 20, 2004 2:06 PM
> To: boost_at_[hidden]
> Subject: [boost] enabling automatic memory leak detection with VC
> 
> 
> While investigating shared_ptr serialization, I've come upon 
> the VC method
> used for detecting memory leaks.  I had previously used it as 
> part of MFC
> and found it very helpful.  By including the following at the 
> beginning of
> one's test program:
> 
> #define _CRTDBG_MAP_ALLOC
> #include <stdlib.h>
> #include <crtdbg.h>
> 
> struct leak_reporter {
> 	static leak_reporter instance;
> 	leak_reporter(){
> 		_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF |
> _CRTDBG_LEAK_CHECK_DF );
> 	}
> 	~leak_reporter(){
> //		_CrtDumpMemoryLeaks(); // replaced by the above
> 	}
> };
> leak_reporter leak_reporter::instance;
> 
> The program displays the following in the output window while 
> running under
> the VC IDE:
> 
> Detected memory leaks!
> Dumping objects ->
> c:\program files\microsoft visual studio .net 
> 2003\vc7\include\crtdbg.h(689)
> : {663} normal block at 0x00325480, 24 bytes long.
>  Data: < ,W             > C4 2C 57 00 00 00 00 00 FF FF FF FF 
> 00 00 00 00 
> c:\program files\microsoft visual studio .net 
> 2003\vc7\include\crtdbg.h(689)
> : {393} normal block at 0x003261F0, 24 bytes long.
>  Data: < ,W             > 94 2C 57 00 00 00 00 00 FF FF FF FF 
> 00 00 00 00 
> Object dump complete.
> 
> The sequential number (663 and 393 in this example) can be 
> used to trap the
> debugger at the original allocation when the test is run the 
> next time.
> 
> Is this not a worthy idea to be included in the test system - 
> at least for
> VC? In this way we would get a report of memory leaks every 
> time we ran a
> test.
> 
> Robert Ramey
> 
> 
> 
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