C ++ - 多维数组

Question

When dealing with multidimensional arrays, is it possible to assign two different variable types to the array...

For example you have the array int example[i][j] is it possible for i and j to be two completely different variable types such as int and string?

Answer 1

Sounds like you're looking for:

std::vector<std::map<std::string, int> > myData1;

or perhaps:

std::map<int, std::map<std::string, int> > myData2;

The first would require you to resize the vector to an appropriate size before using the indexing operators:

myData1.resize(100);
myData1[25]["hello"] = 7;

...while the second would allow you to assign to any element directly (and sparsely):

myData2[25]["hello"] = 7;

Answer 2

No. That's not possible. You may want to look into using the STL map .

Answer 3

No, C++ only allows integer types (ex: int, long, unsigned int, size_t, char) as indexes.

If you want to index by a string, you could try std::map<std::string,mytype> but it gets complicated trying to extend that to two dimensions.

Answer 4

不，但你可以使用std :: maps 。

Answer 5

不，您只能使用整数类型作为索引。

Answer 6

No you can't. You could achieve this with std::map though.