如何将等效的动态分配嵌套向量从C ++写入Obj-C？

Question

We're porting over some C++ .h to Objective C .h files.

Here is a sample of the C++ code we're trying to port over for our class.

    std::vector< std::vector< int > > D2DMap;
    std::vector< std::vector< int > > D3DMap;

We have yet to be successful in declaring an equivalent in Obj-C.

    NSMutableArray *D2DMap = [[NSMutableArray alloc] init];
    NSMutableArray *inner = [[NSMutableArray alloc] init];
    [inner addObject:[NSNumber numberWithInt:someInt]];
    [D2DMap addObject:inner];

But we know this is wrong because it is not dynamic at run time.

Answer 1

You could use Objective-C++.

If you don't want to use Objective-C++, you're sort of out of luck. There is no non-dynamically-typed array in the Cocoa library. You could hack together a solution involving malloc and other generally disgusting things, but I'd recommend against it.