The default allocator adds enough memory for multiple new elements whenever the current array size is exceeded. The array's allocator provides memory as needed when new elements are added to the array. One way is with the Init function, which will fill an array with a number of copies of an element:Īdd and Emplace functions can create new elements at the end of the array: TArrays can be populated in several ways. At this point, no memory has been allocated. No allocator has been specified, so the TArray will use the default, heap-based allocator.

The element type can be any value type that is copyable and destructible according to normal C++ value rules, like int32, FString, TSharedPtr, and so on. This creates an empty array designed to hold a sequence of integers. Creating a TArray variable from another will copy its elements into the new variable there is no shared state. Destruction of a TArray will result in the desctruction of any elements it still contains. The elements are also value types, and the array owns them. It is not designed to be extended, and creating or destroying TArray instances with new and delete is not a recommended practice. TArray is a value type, meaning that it should be treated similarly as any other built-in type, like int32 or float. There are a number of different allocators you can use if you decide that the default behavior is not for you, or you can write your own. It defines how the objects are laid out in memory and how the array should grow to accommodate more elements. The allocator is quite frequently omitted and will default to one which is appropriate for most use cases. TArray is what is called a homogenous container, meaning that all of its elements are strictly the same type you cannot store elements of different types in a single TArray. The element type is the type of the objects that will be stored in the array. TArray types are defined by two properties: Element type, and an optional allocator. TArray is the most common container class within UE4.

As a TArray is a sequence, its elements have a well-defined order and its functions are used to deterministically manipulate those objects and their order.

TArray is responsible for the ownership and organization of a sequence of other objects (called 'elements') of the same type. The simplest container class in Unreal Engine 4 (UE4) is TArray.

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