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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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