part of an inventory example

InventoryComponent.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "InventoryComponent.h"

// Sets default values for this component's properties
UInventoryComponent::UInventoryComponent()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	PrimaryComponentTick.bCanEverTick = true;

	// ...
}


// Called when the game starts
void UInventoryComponent::BeginPlay()
{
	Super::BeginPlay();

	// ...
	
}


// Called every frame
void UInventoryComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	// ...
}

FGuid UInventoryComponent::AddInventoryItem(UInventoryItem* ItemTemplate)
{
	const FItemInstance Inst {ItemTemplate, FGuid::NewGuid()};
	IdToItem.Add(Inst.ItemId, Inst);
	
	return Inst.ItemId;
}

void UInventoryComponent::RemoveInventoryItem(FGuid ItemId)
{
	IdToItem.Remove(ItemId);
}

void UInventoryComponent::SwapInventoryItem(FGuid ItemIdLeft, FGuid ItemIdRight)
{
}

InventoryComponent.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "InventoryItem.h"
#include "Components/ActorComponent.h"
#include "InventoryComponent.generated.h"


USTRUCT(BlueprintType)
struct FItemInstance
{
	GENERATED_BODY()

	UPROPERTY(BlueprintReadOnly)
	UInventoryItem* ItemTemplate;

	UPROPERTY(BlueprintReadOnly)
	FGuid ItemId;
};

UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class GRIMFUTURE_API UInventoryComponent : public UActorComponent
{
	GENERATED_BODY()

public:	
	// Sets default values for this component's properties
	UInventoryComponent();

protected:
	// Called when the game starts
	virtual void BeginPlay() override;
	
	UPROPERTY(BlueprintReadOnly)
	TMap<FGuid, FItemInstance> IdToItem;

public:	
	// Called every frame
	virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;

	UFUNCTION(BlueprintCallable)
	FGuid AddInventoryItem(UInventoryItem* ItemTemplate);

	UFUNCTION(BlueprintCallable)
	void RemoveInventoryItem(FGuid ItemId);

	UFUNCTION(BlueprintCallable)
	void SwapInventoryItem(FGuid ItemIdLeft, FGuid ItemIdRight);
};

InventoryItem.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "InventoryItem.h"

InventoryItem.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Engine/DataAsset.h"
#include "InventoryItem.generated.h"

/**
 * 
 */
UCLASS()
class GRIMFUTURE_API UInventoryItem : public UDataAsset
{
	GENERATED_BODY()

public:
	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	FString ItemName;

	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	FString ItemDescription;

	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	int Value;

	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	int Rarity;

	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	UTexture2D* ItemThumbnail;

	UPROPERTY(EditAnywhere, BlueprintReadOnly)
	USkeletalMesh* ItemMesh;
};