TArray remove* function call cause editor crash

Development Programming & Scripting
1

Hi,

When I use TArray with iterator, and selectively remove some of the elements, editor will crash during execution.

source code:
.h

class TestElem {
public:
	int ID;
	TestElem(int idx);
	~TestElem();
};
    TArray<TestElem *> TestTArray2;

.cpp

for (i = 0; i < 10; ++i)
{
	TestTArray2.Add(new TestElem(i));
}

for (auto it : TestTArray2)
{
	UE_LOG(LogSanguo, Warning, TEXT("index for tarray2 %d"), TestTArray2.Find(it));

	if (it->ID == 3)
            { 
		// TestTArray2.RemoveAll([&it](TestElem *& Element) { return Element->ID == it->ID; });    --> cause crash
		// TestTArray2.RemoveAt(TestTArray2.Find(it), 1, true);    --> cause crash, in the code I comment them all
            }

	UE_LOG(LogSanguo, Warning, TEXT("remove done for tarray2"));
}

All remove* has issues, takes Remove() as an example, in the array.h, it looks like:

int32 Remove(const ElementType& Item)
{
	CheckAddress(&Item);

	// Element is non-const to preserve compatibility with existing code with a non-const operator==() member function
	return RemoveAll([&Item](ElementType& Element) { return Element == Item; });
}

the checkAddress function here is to “Checks that the specified address is not part of an element within the container.” Certainly it is in the range, and I want to remove it. So it will fail…

I believe removesingle() and remove*() has similar issue…

Could you help to confirm it? :slight_smile:

BRs