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    <p>This is from the advanced windows debugging book I take it, not sure what you mean as you get kind of vague towards the end, however what it basically means is as follows:</p> <p>When you allocate heap space the contents of the heap are not necessarily pre-determined, so you can use that allocated space as you see fit: for example, I allocate 1 megabyte of heap memory, and I then decide to populate that space with only 512k or data, that would mean I have committed half of my allocated heap, leaving a further 512k free. That memory will still show as being utilised to the OS because I have explicitly set the heap allocation to 1024k, however next time I use that same space I could use more or less than the 512k I utilised last time, up to the amount I have allocated for use. The amount you use at a given point is the commit, the amount you have set aside is the allocation. </p> <p>This is all much much simplified, and I would recommend reading such sources as:</p> <ul> <li><a href="https://stackoverflow.com/questions/5836309/stack-memory-vs-heap-memory">stack-memory-vs-heap-memory</a> from here</li> <li><a href="http://www.learncpp.com/cpp-tutorial/79-the-stack-and-the-heap/" rel="nofollow noreferrer">the-stack-and-the-heap</a> from learn CPP</li> <li><a href="http://gribblelab.org/CBootcamp/7_Memory_Stack_vs_Heap.html" rel="nofollow noreferrer">Memory_Stack_vs_Heap</a> from CBootCamp</li> </ul> <p>As good sources to get you started on memory and its usage in C++.</p> <p>If there is anything specific or more detail you can think of (your question is a bit unclear) then let me know and I will get back to you as soon as possible.</p>
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