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1 | #include <Eigen/Core>
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2 | #include <iostream>
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3 | using namespace Eigen;
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4 | using namespace std;
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5 |
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6 | template<typename Derived>
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7 | Eigen::VectorBlock<Derived, 2>
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8 | firstTwo(MatrixBase<Derived>& v)
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9 | {
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10 | return Eigen::VectorBlock<Derived, 2>(v.derived(), 0);
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11 | }
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12 |
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13 | template<typename Derived>
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14 | const Eigen::VectorBlock<const Derived, 2>
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15 | firstTwo(const MatrixBase<Derived>& v)
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16 | {
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17 | return Eigen::VectorBlock<const Derived, 2>(v.derived(), 0);
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18 | }
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19 |
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20 | int main(int, char**)
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21 | {
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22 | Matrix<int,1,6> v; v << 1,2,3,4,5,6;
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23 | cout << firstTwo(4*v) << endl; // calls the const version
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24 | firstTwo(v) *= 2; // calls the non-const version
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25 | cout << "Now the vector v is:" << endl << v << endl;
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26 | return 0;
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27 | }
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