UObject class in Unreal Engine

Iterating over UObjects

The function below can be used for all Run-Time instances of UObject. Iterators in Unreal Engine are always accurate. More info about Iterators in the Iterators handbook

#include "EngineUtils.h"
void AExampleClass::PrintAllObjectsNamesAndClasses()
{
  for (TObjectIterator<UObject> Itr; Itr; ++Itr )
  {
    ClientMessage(Itr->GetName());
    ClientMessage(Itr->GetClass()->GetDesc());
  }
}

• Object iterator is going to iterate over objects in the Pre-PIE world / the Editor World. This is not an issue when the game is running as an independent Game Instance / the editor is closed. Otherwise it can lead to unexpected results.
• Object Iterator does not require a UWorld* Context - so Object Iterator is the way to get the proper context and access the entire living game world even when there's not possible to obtain the World().
• UObject iterator can contain as well as iterate over all components that are inherited from this class, see Get Asset based of Class example. It can also iterate over TObjectIterator<AActor> Itr;, TObjectIterator<ACharacter> Itr; and others.

Get Asset based of Class

As UObject is a class from which many Classes is inherited, it may be used for a parameter that allow to transfer any type of its inherited assets, see the code below:

#include "Engine/StaticMesh.h" // Engine
#include "Engine/SkeletalMesh.h" // Engine
#include "Engine/Texture.h" // Engine
#include "Animation/AnimSequence.h" // Engine
#include "Engine/DataTable.h" // Engine
#include "Sound/SoundWave.h" // Engine
UAssetImportData* UExampleClass::GetAssetImportData(UObject* Asset)
{
  if (Cast<UStaticMesh>(Asset) != nullptr) // UStaticMesh
  {
    return Cast<UStaticMesh>(Asset)->AssetImportData;
  }
  else if (Cast<USkeletalMesh>(Asset) != nullptr) // USkeletalMesh
  {
    return Cast<USkeletalMesh>(Asset)->GetAssetImportData();
  }
  else if (Cast<UTexture>(Asset) != nullptr) // UTexture
  {
    return Cast<UTexture>(Asset)->AssetImportData;
  }
  else if (Cast<UAnimSequence>(Asset) != nullptr) // UAnimSequence
  {
    return Cast<UAnimSequence>(Asset)->AssetImportData;
  }
  else if (Cast<UDataTable>(Asset) != nullptr) // UDataTable
  {
    return Cast<UDataTable>(Asset)->AssetImportData;
  }
  else if (Cast<USoundWave>(Asset) != nullptr) // USoundWave
  {
    return Cast<USoundWave>(Asset)->AssetImportData;
  }
  // .. any other asset type inherited from UObject
  return nullptr;
}