If you rename the .i file as a .cpp you can then add it to your project and right-click-Compile it individually. If it still shows the original line numbers then generate the .i file again but turn on the "Preprocess Suppress Line Numbers" setting as well.
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I will definitely try this right away and let you know.
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Since this is C++11 code, let's go back to basics for a moment. Exactly *which* version of Visual Studio are you using?
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I am NOT using C++11. I am using Visual Studio 2005,