Array of vectors

[Rajesh V]

We can declare a vector of five 5-element vectors by

vector< vector<int> > v1( 5, vector<int> (5) );

We can declare an array of five empty vectors by

vector<int> v2[5];

But how can we declare an array of five 5-element vectors?

[weaknessforcats]

First, defining a vector of 5 elements just allows for 5 elements but you could add any number of additional elements.

Second, an array has a fixed number of elements so an array of vectors seems really odd. You should use a vector of vectors. Arrays should be discarded when vector is available. By the time you write the code to manage the array, you will have re-written most of vector and probably have done it in a unique way that can't be used elsewhere.

Third, all of this should be buried in a class. The class member functions can ensure that only 5 elements are allowed in your vector< vector<int> >.