如何使用 natvis Visual Studio C++ 调试器可视化工具对单一类型进行多个列表扩展

Question

I'm trying to make debugger visualizer for container that stores values in chunks. I want to make list expansion both for values and for chunks, but as far as I can see single type can have only one list expansion. There may be multiple Expand subnodes like ArrayItems but they all produce single list. Yes, I can make chunks expansion for container and then make value expansion for each chunk. But I want two container subnodes with expandsions like this:

MyList
|-values
| |-0
| |-1
|
|-chunks
| |-0
| |-1

Is there a way to do it using natvis xml?

Answer 1

You can use <Synthetic> for that. The code inside <Synthetic> can be for example <Item> or <ArrayItems> , but also any other item type.

<Type Name="MyList">
  <DisplayString>...</DisplayString>
  <Expand>
    <Synthetic Name="values">
      <DisplayString>...</DisplayString>
      <Expand>
        <!-- code for displaying as values -->
      </Expand>
    </Synthetic>
    <Synthetic Name="chunks">
      <DisplayString>...</DisplayString>
      <Expand>
        <!-- code for displaying as chunks-->
      </Expand>
    </Synthetic>
  </Expand>
</Type>