Can I Use vector's Fill Constructor to Create a Multi-Dimensional Array?

Asked Feb 03 '15 at 21:20

Active Feb 03 '15 at 21:26

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I want to create a multi-dimensional array, let's say m x n Can I accomplish something like that using the fill constructor of a vector?

For example:

vector<vector<int>> foo(n, vector<int>(m));

The closest thing I saw addressing this on StackOverflow was: How do I declare and initialize a 2d int vector in C++? But it looked like there was still some question of whether it was legal.

I am using Visual Studio 2013 and it seems to work fine.

EDIT:

I'm also going to guess here that this creates a temporary vector of size m copies it n times and then destroys it. Will the compiler optimize out that temporary construction? I'm hoping the answer to that is yes, cause using a move here seems like it wouldn't accomplish what I hope either.

edited May 23 '17 at 12:06

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asked Feb 03 '15 at 21:20

Jonathan Mee

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I don't see any question about its legality. This is fine. – juanchopanza Feb 03 '15 at 21:23
Another possible duplicate: http://stackoverflow.com/questions/12375591/vector-of-vectors-to-create-matrix – juanchopanza Feb 03 '15 at 21:26

Can I Use vector's Fill Constructor to Create a Multi-Dimensional Array?

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