mouse-over to peek a field after operator->() in Visual Studio while debugging

Question

I had a tiny class:-

class A{   public:int aField;   }

Below, while debugging, if I hover mouse around aField in a->a

Answer 1

That's exactly the case for natvis visualizers! Luckily, you're using VS2015, where they're fully supported.

For your example

class APtr
{
public:
    APtr(A* a_Pointer)
    {
        ptr = a_Pointer;
    }

    A* operator->()
    {
        return ptr;
    }

private:
    A* ptr;
};

You will need to create a file with .natvis extension, for example APtr.natvis, with the following content:

<?xml version="1.0" encoding="utf-8"?>

<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
  <Type Name="APtr">
      <SmartPointer Usage="Minimal">ptr</SmartPointer>
  </Type>
</AutoVisualizer>

Then you simply add this file to your project, like any other .cpp file, and start debugging!

For composing anything more complicated, I highly recommend finding built-in *.natvis files in C:\Program Files (x86)\Microsoft Visual Studio 14.0 and using them as example.

Answer 2

The debugger doesn't recognize the operator->, but you can get the same information by hovering over the smart pointer variable and then the right arrow on the tooltip: