How can I resize a 2D vector of objects given the width and height?
My class, GameBoard
, has a member variable that is a 2D vector of an object of the class Tile
. The GameBoard
constructor takes width and height as parameters.
How can I get the 2D vector of Tile
objects to resize according to the width and height passed to the constructor? How can I fill it with Tile
objects so that I can do something like this?
myVector[i][j].getDisplayChar();
Snippet
m_vvTiles.resize(iHeight);
for(auto it = m_vvTiles.begin(); it != m_vvTiles.end(); it++ ){
(*it).resize(iWidth,Tile(' '));
}
Solution 1:
You don't need to create external loop to resize a 2 dimensional vector (matrix). You can simply do the following one line resize()
call:
//vector<vector<int>> M;
//int m = number of rows, n = number of columns;
M.resize(m, vector<int>(n));
Hope that helps!
Solution 2:
You have to resize the outer and inner vectors separately.
myVector.resize(n);
for (int i = 0; i < n; ++i)
myVector[i].resize(m);