This project do nothing but for test display of variables content (OpenCASCADE classes), in debugger windows.
Suggest use Visual Studio 2015 or later, as:
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In Visual Studio 2012 and later, visualizers can be put in a separate file in subdirectory Visualizers.
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In Visual Studio 2015, visualizers can support CustomListItems for customized display of hashtable. In OCCT, there are many hashtables, NCollection_Map, NCollection_IndexedMap, etc. I don't know whether support or not CustomListItems in vs2013, but certainly not support in vs2012.
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NCollection_Array2. ArrayItems support customized multi-dimensional arrays, but it looks like need an array for given the size of every row, I do not know how to do this if not modify the structure of NCollection_Array2. So it will display wrong content for NCollection_Array2 when not equal of the results for (myUpperCol - myLowerCol) and (myUpperRow - myLowerRow);
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the types base on NCollection_BaseMap. I only traversed the first layer of hashtable. Fortunately, this is usually case of hashtable, as the need to avoid collision. However, this is not strict.
Clone this project, and test it, you will see the effect of customized.
But if you want the effect also in other projects, you should do the next step:
Download the occt.natvis and put it in the the user-specific natvis directory (%USERPROFILE%\My Documents\Visual Studio 2015\Visualizers), or the system-wide Natvis directory (%VSINSTALLDIR%\Common7\Packages\Debugger\Visualizers). This is where .natvis files that are installed with Visual Studio are copied. You can add other files to this directory as well if you have administrator permissions.
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Debugging tools and hints, using Visual Studio debugger, customized display of variables content, from the OpenCASCADE doc.