Function calls to dynamically allocated matrices

I'm having difficulty calling a function that manipulates a
dynamically allocated array and returns it to main. I don't
understand enought about how this class template works to successfully
do this, I suppose. If anyone has advice I'd appreciate it...
Dynamically allocated arrays template:
Cline, M., C++ FAQ Lite document, http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.19,
10/22/2008

template<class T> class Matrix {
  public:
    Matrix(unsigned nrows, unsigned ncols);
    class BadSize { };

    T& operator() (unsigned i, unsigned j);
    const T& operator() (unsigned i, unsigned j) const;

    class BoundsViolation { };

    unsigned nrows() const;
    unsigned ncols() const;

  private:
    std::vector<std::vector<T> > data_;
  };

  template<class T>
  inline unsigned Matrix<T>::nrows() const
  { return data_.size(); }

  template<class T>
  inline unsigned Matrix<T>::ncols() const
  { return data_[0].size(); }

  template<class T>
  inline T& Matrix<T>::operator() (unsigned row, unsigned col)
  {
    if (row >= nrows() || col >= ncols()) throw BoundsViolation();
    return data_[row][col];
  }

  template<class T>
  inline const T& Matrix<T>::operator() (unsigned row, unsigned col)
const
  {
    if (row >= nrows() || col >= ncols()) throw BoundsViolation();
    return data_[row][col];
  }

  template<class T>
  Matrix<T>::Matrix(unsigned nrows, unsigned ncols)
    : data_ (nrows)
  {
    if (nrows == 0 || ncols == 0)
      throw BadSize();
    for (unsigned i = 0; i < nrows; ++i)
      data_[i].resize(ncols);
  }

Within main, there is no difficulty manipulating array A. I'm having
problems setting up a function prototype and call that allow A to be
manipulated within the function and returned to main as A.

Function prototype:
int* FORM(int A(int x, int y));

{ Note: this declares the parameter A as a function type. -mod/sk }

Create array A:
Matrix<int>A(x, y);

Function call within main:
A = FORM( A(x, y) ); ERROR: error C2664: 'FORM' : cannot convert
parameter 1 from 'int' to 'int (__cdecl *)(int,int)'

Function:
int* FORM(int A(int x, int y));
// Do something with A
return A;

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