AssetManager asynchronous loading assets

I am trying to load inventory aynchronously because I want dlc functionality in the future. In ActionRPG example project, it uses “AsyncLoadPrimaryAssetList” node in Blueprint. But I can’t use  it in C++.  Do you know how to use this in C++. If not how do you async load assets. The asset manager doesnt seem to have a function for that. Can you point me to right direction. Where should I look at to asynch load assets.
 Note : I allready read documentation about async loading assets and asset manager but couldnt implement it.
 Thanks in advance.