TArray Find No operator found or suitable conversion

Development Programming & Scripting C++
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1

I created a custom struct called FItem. Then I declared an Array in my header:

TArray>FItem MyItems; (cant write the arrows here but they are done correctly in my code)

Then in my cpp

FItem Temp;

MyItems.Find(Temp);

And I get the following compile error:

Error 2 error C2678: binary ‘==’ : no operator found which takes a left-hand operand of type ‘const FItem’ (or there is no acceptable conversion)
Any ideas why this is happening?

2

It’s in the Find() method

3

Where do you use == operator? you dont have in code you pasted, check the line that error is pointing to, considering it’s ==, it’s most likely “if” condition

4

I assumie that FItem is custom data struct.

You need to overload == operator inside it. Find assumes there is operator == which will compare two values.

http://en.wikibooks.org/wiki/C%2B%2B_Programming/Operators/Operator_Overloading

5

Thank you VERY VERY VERY much! You didn’t only help me on this issue but made me realize the way to approach 2 or 3 problems I ran into earlier this week. Thanks!

6

Hi guys,

the same error occurs for me even though I have overwitten the == operator.

To visualise what I’ve done so far here are some code snippets:

I’ve defined the struct within its own .H file:

USTRUCT()
struct FInventoryItem
{
	GENERATED_USTRUCT_BODY()
	UPROPERTY()
	AActor* aItemActor;
	UPROPERTY()
	FText ftDescription;

	FInventoryItem()
	{
		aItemActor = NULL;
		ftDescription = NSLOCTEXT("test_english", "PickupText", "PickupText");
	}

	bool operator == (const FInventoryItem rhs)
	{
		if (aItemActor == rhs.aItemActor && ftDescription.EqualTo(rhs.ftDescription))
		{
			return true;
		}
		else return false;
	}
};

Within a saperate class header I’ve defined an array which contains these Items:

TArray<FInventoryItem> arrInventory;

As soon as I call (within my .CPP):

arrInventory.Contains(AnotherFInventoryItem);

I get the compiler error :

binary '==' : no operator found which takes a left-hand operand of type 'const FInventoryItem' (or there is no acceptable conversion)

as well as:

could be 'bool FInventoryItem::operator ==(const FInventoryItem)' 
or 'bool operator ==(const FDialogueContextMapping &,const FDialogueContextMapping &)' 
or 'bool operator ==(const FDialogueContext &,const FDialogueContext &)'
...

So the compiler knows about my overwritten method but doesn’t use it. Any idea what I am missing?

7

Well obviously the parameters of the overwritten operator weren’t correct.
If I do it this way everything works just fine:
bool operator==( const FInventoryItemStruct& Other ) const

8

Other methods in TArray can call Find such as RemoveSingle. Just happened to me and google sent me here.

9

Yes dude, Thank you so much. Remove() was the problem in my case!

10

not working for me, i still get same error when i use .Contains() function in TArray, even if i write operator exac same way.