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    <p><s>Two</s>Three big problems here:</p> <ol> <li>Why are you <code>new</code>ing <code>struct</code>s anyway? You should probably use some form or RAII container instead. If you were, you wouldn't have to worry about memory leaks at all (unless there were bugs in the container of course) Examples include <code>std::vector</code> and <code>std::auto_ptr</code>. If you have access to C++0x there is also <code>std::unique_ptr</code> and <code>std::shared_ptr</code>. If you have access to TR1 only (or the boost libraries), similar containers available are <code>std::tr1::shared_ptr</code>, and <code>std::tr1::scoped_ptr</code>. (Which are in the <code>boost::</code> namespace in the boost incarnations)</li> <li>Windows' task manager reports virtual memory consumed by the process. The <code>delete</code> call merely returns the memory to the C runtime. The C runtime does not always immediately return the memory back to the operating system, because OS allocations (via <a href="http://msdn.microsoft.com/en-us/library/aa366887%28VS.85%29.aspx" rel="nofollow"><code>VirtualAlloc</code></a>) are extremely expensive.</li> <li>It's <code>int main()</code> !</li> </ol> <p>To determine whether memory is actually allocated, you would need that tool to operate at C runtime level, not at operating system level.</p>
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    1. POAfter a sequence of new/delete on structs, I seem to have memory loss
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    1. USBilly ONeal
    1. USBilly ONeal
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    1. CO+1 as point 2 is an answer and point 3 is valuable. But point 1? Doesn't the code scream "I'm learning stuff and here are my experiments with a linked list" ? Sure, since it's supposed to be in C++, it would look much better, if that list was a class, not a bunch of global variables, but isn't sense of such experiments obvious. Let me guess. You like to ask questions, that verify the ability to manipulate list nodes in an interview and you like when people fail.
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      1. USMaciej Hehl
    2. CO@Maciej: Too often I see people "learning" C++ and they write code like this because they come from C# and Java land, where such code is not a problem. However, "idiomatic" Java or C# is horrendously bad C++ code. I always put things like this in here, even for beginners, because using `new` on structs is indicative of a misunderstanding of C++ object lifetimes. I wish someone had told me this before I went around writing garbage code for several years.
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      1. USBilly ONeal
    3. COAs for your last sentence, I have no idea about what you're talking about. I'm nowhere near in a position where I would ever be doing interviews, but if you were applying for a job working in C++ and did not know how to manipulate linked lists, you would not be getting a job with me. That's all covered in first year CS courses and is something that someone applying for a programming job should (at least conceptually) understand. (Of course, being able to rattle off perfect code on a whiteboard would not be required)
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