Hover over any symbol in Visual Studio, whether it's a function or a class, and the relevant documentation will appear in the quick info tooltip.
Enhanced parameter info tooltips allow you to view information about the current parameter as you type code.
Replace Visual Studio's F1 help with one that uses cppreference.
Instantly search for any symbol in the standard library and navigate to it's documentation.
Use the Documentation Browser to navigate around cppreference without leaving Visual Studio!
Highlight signatures for symbols that use function overloading.