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the dodger uk

c++ memory leaks detection

16 posts in this topic

is there any good programs that detect memory leaks and can point you in the right direction

i need a really good one , not even mind paying real money to buy a professional software that can do it  

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For what platform/compiler? Some compilers have built in functionality for this (ex: MSVC's crtdbg.h header contains leak detection functions).
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And when running MinGW on Windows, you're out of luck for free options as far as I've looked. sad.png

Edited by Servant of the Lord
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There's also www.drmemory.org, which is similar to valgrind but also works on windows.
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sorry , its for  windows and c++ , and not .net 

 

its  a big project and memory leaks are killing it after a bit , just trying to track down the source 

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Are you using smart pointers such as std::auto_ptr or std::tr1::shared_ptr?

These will help prevent almost all memory leak issues and really are the way to go in modern C++. Afterall, prevention is better than cure ;) Edited by Karsten_
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If you like doing it yourself there is always the possibility of overriding global new and delete operators (normal and array version) and possibly use some makro magic to include __FILE__ and __LINE__ in the calls inside of files where you expect errors (that needs 1 more operator for all variants), when doing a debug build. Then collect data in there and print out a log for calling wrong operator delete, deleting twice and remaining allocations at end of your program.

Though using some premade library would probably give you better results.

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If you like doing it yourself there is always the possibility of overriding global new and delete operators

I don't terribly recommend this approach. It can play havoc when your project incorporates DLLs, as the correct new/delete operator isn't always used across DLL boundaries...

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Yeah as said I would only do that in a debug build not on your release.

Also its safer anyways to not allocate anything inside one dll and deallocate it outside and then there should be no problem. If there is one, it just brought a possible bug to surface, which was the point of overwriting it.

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std::auto_ptr was designed badly and has been deprecated.

Yeah true, so can't really be called "modern C++". But it is better than using "raw" pointers for everything I suppose.

<offtopic>
Though personally I always find it a tossup between using the deprecated auto_ptr or dragging in boost as a dependency when tr1 isn't available.
</offtopic>

My favorite solution though is to just write code modules in a cross platform manner and use Valgrind in a VM to test them before release. Especially when developing on embedded platforms or OpenBSD.
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