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#include "../Eigen/Sparse"
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using namespace Eigen;
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void call_ref(Ref<SparseMatrix<float> > a) { }
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int main()
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{
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SparseMatrix<float> a(10,10);
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SparseMatrixBase<SparseMatrix<float> > &ac(a);
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#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
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call_ref(ac);
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#else
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call_ref(ac.derived());
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#endif
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}
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