C++ Vector of vectors
c++, vector
Solution
In the line `return row[row][col];` the first `row` is the `int&`, not the `vector`.
The variable declared in the inner scope is shadowing the variable in the outer scope, so the compiler is trying to index an `int` rather than a `vector`, which it obviously can't do.
You should fix your variable names so that they don't conflict.
EDIT: Also, while the error that you're getting indicates that the compiler is finding the wrong `row` variable, as A. Levy points out, you also have a problem with the declaration of your `vector`, so even if you fix the variable names, if you have indeed declared the `vector` as shown here, it won't compile. Nested templates need spaces between the `>` symbols, otherwise the compiler will read `>>` as a right-shift operator rather than part of a template declaration. It needs to be
std::vector<std::vector<int> > row;
or
std::vector< std::vector<int> > row;
In addition, as you're doing this in a header file, you're going to need to tack the `std::` tag on the front of anything from the std namespace - such as `vector`. If it were in a cpp file, then you could use `using namespace std;` but that would be very bad to do in a header file (since it would pollute the global namespace). Without the `std::` tag or the `using` statement, the compiler won't recognize `vector`.
Problem
I have a class header file called Grid.h that contains the following 2 private data object: ``` vector<int> column; vector<vector<int>> row; ``` And a public method whose prototype in Grid.h is such: ``` int getElement (unsigned int& col, unsigned int& row); ``` The definition of above mentioned function is defined as such in Grid.cpp: ``` int getElement (unsigned int& col, unsigned int& row) { return row[row][col] ; } ``` When I run the program, I get this error: ``` error C2109: subscript requires array or pointer type ``` Whats going wrong?