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A recent check in of mine raised a few eye brows during reviews. I checked in a few macros which ended with/contained a "do{}while(0)" and people were curious as to why. In my experience there are two main uses for it. Insert an empty statement with no
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CComObject::CreateInstance is a light weight method for creating instances of COM objects in your code. Unfortunately the design of the API makes it easy to introduce subtle errors into your code. The two problems are it encourages manually ref counting
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ATL has a lot of great tools for COM programming and CComPtr is a good example. It's a smart pointer class which manages the reference count of an underlying COM object. One of it's limitations though is it will only work properly when the inheritance
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See my previous two posts on an introduction to placement new if you are unfamiliar with the subject. http://blogs.msdn.com/jaredpar/archive/2007/10/16/c-new-operator-and-placement-new.aspx http://blogs.msdn.com/jaredpar/archive/2007/10/17/c-placement-new-and-allocators.aspx
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This is a follow up for my previous post about operator new and placement new. This post will discuss the role of adding a custom allocator and using it with new. It's handy to use custom allocators in C++. Certain operations can be done more efficiently
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Originally I was going to write this article to detail a particular problem I had recently with placement new in C++. A page or two of writing later I decided it would be best to start with an introduction to the "new" operator itself and the in/outs
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