I am not removing the unique location nor unique transform of the container, I remove the random item place in one of the container in item group which has 5 containers , and place corresponding ammo type the weapon in the group.
the item removed will have chance to hit again and spawn in another group
Please use a Set if you need uniqueness. It literally does it for you as itās impossible to add a duplicate item to a set.
Hereās some brief overview of a TSet in unreal. IE you can have TSet<FTransform> (This works for BP too!)
If you need them to be findable by index use a map! They are a unique pair! Also blueprints
TMap<int, FTransform>
Sets ā TSet | Unreal Engine Documentation
Maps ā TMap | Unreal Engine Documentation
The problem is not the TArrays but the problem is the find function and == not working with FTransform Arrays, I canāt do something like :
if(TransformArray.find(TransformLocation) == -1) {}
if You think Sets or Maps will work , please write an solution so i can get rid of this issue. 
My opinion is based only on the code you showed(in another thread)
I;m little confused, because what you wrote is contrary to what can be read in the code.
Tell me why it canāt be look like:
//...
ItemGroupRef->GetAllTransforms(Available);
Algo::RandomShuffle(Available);
for (auto SpawnArrayElements : ItemsIDArr) {
SpawnType = SpawnArrayElements.Type;
SpawnID = SpawnArrayElements.ID;
auto SpawnLocation = Available.Last();
Available.Pop();
switch (SpawnType) {
// ...
You need to overload the == operator for transforms. Iād declare this function in some kind of namespace so you donāt step on other declarations if you encounter any.
FORCEINLINE bool operator==(const FTransform& LTransform, const FTransform& RTransform)
{
return
(
LTransform.ToMatrixNoScale() == RTransform.ToMatrixNoScale()
);
}
That will compare the orientation and translation of two transforms to decide equivalence
FORCEINLINE bool operator==(const FTransform& LTransform, const FTransform& RTransform)
{
return
(
LTransform.GetLocation() == RTransform.GetLocation()
);
}
That one will decide equivalence only based off of locations. In which case, if you donāt care about rotations for what you are doing I would just switch now to using FVectors for locations because they already have an == operator 
and they have a smaller footprint.
I would declare this in the header of the class that needs it to keep it within a namespace
Sir this I have already, (Ftransfrom == Ftransform) the issue is need to do something to find the index of the array like
Index = FCustomThunkTemplates::Array_Find(TransformArray, Location);
Sir do I need to create a member for Algo RandomShuffle ? copiler says algo donāt have a member RadomShuffle
I think you are misunderstanding what Find does for TArrays in c++.
If you have TArray<FTransform> Transforms;
Transforms.Find(SomeTransform); ā this will return the INDEX the transform is at in the array if it exists.
Therefore you now need to get the value at the index, like so.
FTransform TransformToFind = Transforms[Transforms.Find(TransformImTryingToFind)];
If I directly translate you blueprint code it would look like this.
UsedLocations.Add(Available[UsedLocations.Find(Location)]);
Or
UsedLocations.AddUnique(Available[UsedLocations.Find(Location)]); ā Requires operator overloading (Which you said you have)
and then how to get the return index to compare if == -1
There are better ways to write this code - but Iāll keep it explicit so you can see whatās going on - Directly from your blueprint code
const int LocationFoundAtIndex = UsedLocations.Find(Location); //<-Saves the index you found
if(LocationFoundAtIndex == -1)
{
//Do Something
}
else
{
SpawnLocation = Location;
UsedLocations.Add(SpawnLocation);
}
says == no operator found, left hand operand...
I donāt get that error, it must be somewhere else in your code base.
this is the full error
binary '==': no operator found which takes a left-hand operand of type 'const FTransform' (or there is no acceptable conversion)
You probably donāt have an == operator for the CONST version of FTransform. You can either remove the const on const FTransform where the error is or add another operator for == for the const version of FTransform.
You are going way to deep.
The error is telling you that you donāt have the proper operator== for āconst FTransformā
Meaning you probably have
FORCEINLINE bool operator==(FTransform LTransform, FTransform RTransform)
but not also a
FORCEINLINE bool operator==(const FTransform LTransform, const FTransform RTransform)
operator ==': error in function declaration; skipping function body
in my.h
FORCEINLINE bool operator==(const FTransform LTransform, const FTransform RTransform);
in my.cpp
FORCEINLINE bool AmyGameMode::operator==(const FTransform LTransform, const FTransform RTransform)
{
return
(
LTransform.GetLocation() == RTransform.GetLocation()
);
}
binary āoperator ==ā has too many parameters