Method BuildMapPointers

source/common/objects/dobjtype.cpp:917–967

//==========================================================================

void PClass::BuildMapPointers() const
{
	using pairType = std::pair<size_t, PMap *>;

	if (MapPointers != nullptr)
	{ // Already built: Do nothing.
		return;
	}
	else if (ParentClass == nullptr)
	{ // No parent (i.e. DObject): Make MapPointers a harmless non-nullptr.
		MapPointers = (pairType*)(&TheEnd);
		MapPointersSize = 0;
	}
	else
	{
		ParentClass->BuildMapPointers();

		TArray<pairType> ScriptPointers;

		// Collect all arrays to pointers in scripted fields.
		for (auto field : Fields)
		{
			if (!(field->Flags & VARF_Native))
			{
				field->Type->SetPointerMap(Defaults, unsigned(field->Offset), &ScriptPointers);
			}
		}

		if (ScriptPointers.Size() == 0)
		{ // No new pointers: Just use the same ArrayPointers as the parent.
			MapPointers = ParentClass->MapPointers;
			MapPointersSize = ParentClass->MapPointersSize;
		}
		else
		{	// New pointers: Create a new FlatPointers array and add them.
			// Concatenate them into a new array
			pairType *flat = (pairType*)ClassDataAllocator.Alloc(sizeof(pairType) * (ParentClass->MapPointersSize + ScriptPointers.Size()));
			if (ParentClass->MapPointersSize > 0)
			{
				memcpy(flat, ParentClass->MapPointers, sizeof(pairType) * ParentClass->MapPointersSize); 
			}

			if (ScriptPointers.Size() > 0)
			{
				memcpy(flat + ParentClass->MapPointersSize, ScriptPointers.Data(), sizeof(pairType) * ScriptPointers.Size());
			}
			MapPointers = flat;
			MapPointersSize = ParentClass->MapPointersSize + ScriptPointers.Size();
		}
	}
}

//==========================================================================
//