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Jazonxyz

2D arrays

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I know how to make 2D arrays in C++ but I dont know how to make them dynamic. I can only make 1D dynamic arrays with std::vector. How can I make 2D arrays with std::vector?

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If you want a 2D array of widthxheight, you just allocate a vector of width*height size, and write a function to correctly calculate the offset based on (x,y).

Or, you can use Boost.

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just use a normal std::vector and access using this formula:


index = y*width + x;



where "width" would be the equivalent to a 2D array declared thusly:


int foo[width][height];



My above equation corresponds to how 2D arrays are organized in memory anyway.

-me

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