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Tutorial_Map_using.cpp
typedef Matrix<float,1,Dynamic> MatrixType;
typedef Map<MatrixType> MapType;
typedef Map<const MatrixType> MapTypeConst;   // a read-only map
const int n_dims = 5;
  
MatrixType m1(n_dims), m2(n_dims);
m1.setRandom();
m2.setRandom();
float *p = &m2(0);  // get the address storing the data for m2
MapType m2map(p,m2.size());   // m2map shares data with m2
MapTypeConst m2mapconst(p,m2.size());  // a read-only accessor for m2

cout << "m1: " << m1 << endl;
cout << "m2: " << m2 << endl;
cout << "Squared euclidean distance: " << (m1-m2).squaredNorm() << endl;
cout << "Squared euclidean distance, using map: " <<
  (m1-m2map).squaredNorm() << endl;
m2map(3) = 7;   // this will change m2, since they share the same array
cout << "Updated m2: " << m2 << endl;
cout << "m2 coefficient 2, constant accessor: " << m2mapconst(2) << endl;
/* m2mapconst(2) = 5; */   // this yields a compile-time error

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