Interview Question

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if they are fixed size a reference to an array of array of array ...
if readonly a const reference

void methode(std::array<std::array<int, n>, m>& array)

if all dimensions are variable, vector of vector which has the issue that each vector has its own size, so it's not necessarily a multidimensional array as we are used to and it's hacky to access the dimension's size

For a matrix I wouldn't use a built in STL type because it will force you to a data representation which might not be what you want e.g. if you want to represent sparse matrix in a memory efficient way.

implementing your own matrix class would be the most effective way to go (except for a coding contest where implementation speed matters more). There you would keep the dimensions and the data seperated and implement a getElement and setElement method. don't get tricked into implementiong something like "[][]-operator" which is a pain due to referencing etc...

what you can do, if you want to provide syntactical sugar is "T& operator() (int row, int col)"

You can as well study the problems of vector<bool> which is a specialized vector (bit-vector) and provides something like:

bool_proxy& operator []

where bool proxy contains conversion to bool ... etc. etc.

- Chris March 21, 2017 | Flag Reply

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