Can a 2D array be the key of a map?

Question

I have to keep count of the occurrences of various sub matrices that occur in a matrix. Can I use a map, keeping the Key as a 2D matrix and the Value as the count? If I can, then what will the syntax be?

`std::map< std::vector>, int > A;` ? Not sure why you need such DS — P0W, Jul 16 '14 at 17:09

score 3 · Accepted Answer · edited May 23 '17 at 12:21

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This has been addressed more generally in the following post:

What requirements must std::map key classes meet to be valid keys?

edited May 23 '17 at 12:21

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answered Jul 16 '14 at 17:28

user3814483

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Can a 2D array be the key of a map?

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