Where do i declare my IOC Container?

Development Programming & Scripting
2

Figured it out. -

Start with an interface:

IDebugHelper.h

#pragma once
struct IDebugHelper
{
public:
	virtual void WriteInfo() = 0;
};

DebugHelper.cpp

#include "TEST.h"
#include "IDebugHelper.h"
#include "Runtime/Core/Public/Templates/UnrealTypeTraits.h"

Expose_TNameOf(IDebugHelper)

Now for the implementation:

OnScreenDebugHelper.h

#pragma once

// Project includes
#include "Abstracts/IDebugHelper.h"

class OnScreenDebugHelper : public IDebugHelper
{
public:
	void WriteInfo() override;
};

OnScreenDebugHelper.cpp

#include "TEST.h"
#include "OnScreenDebugHelper.h"

void OnScreenDebugHelper::WriteInfo()
{    
}

Now to register your interface to your implementation on an ioc container

TESTGameInstanceBase.h

#pragma once

// UE includes
#include "Engine/GameInstance.h"
#include "Runtime/Core/Public/Misc/TypeContainer.h"

#include "TESTGameInstanceBase.generated.h"

class TEST_API UTESTGameInstanceBase : public UGameInstance
{
	GENERATED_BODY()    
public:    	
	UTESTGameInstanceBase();    
	TTypeContainer<>& GetIOCContainer() { return this->iOCContainer; }    
private:    
	TTypeContainer<> iOCContainer;    
};

TESTGameInstanceBase.cpp

#include "TEST.h"
#include "Models/GameInstances/TESTGameInstanceBase.h"

// 
#include "Abstracts/IDebugHelper.h"
#include "Helpers/OnScreenDebugHelper.h"

UTESTGameInstanceBase::UTESTGameInstanceBase() {
	this->iOCContainer.RegisterClass<IDebugHelper, UOnScreenDebugHelper>(ETypeContainerScope::Instance);
}

And finally, to use it:

if (GetWorld() != nullptr)
{
	if (this->GetGameInstance() != nullptr)
	{
		TSharedPtr<IDebugHelper> debugHelper = ((UMainGameInstance*)this->GetGameInstance())->GetIOCContainer().GetInstance<IDebugHelper>();
	}
}