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Diffstat (limited to 'doc/examples/class_CwiseBinaryOp.cpp')
-rw-r--r-- | doc/examples/class_CwiseBinaryOp.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/examples/class_CwiseBinaryOp.cpp b/doc/examples/class_CwiseBinaryOp.cpp new file mode 100644 index 000000000..2a0f11a75 --- /dev/null +++ b/doc/examples/class_CwiseBinaryOp.cpp @@ -0,0 +1,27 @@ +#include <Eigen/Core> +USING_PART_OF_NAMESPACE_EIGEN +using namespace std; + +// define a custom template binary functor +struct CwiseMinOp { + template<typename Scalar> + static Scalar op(const Scalar& a, const Scalar& b) { return std::min(a,b); } +}; + +// define a custom binary operator between two matrices +template<typename Scalar, typename Derived1, typename Derived2> +const Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2> +cwiseMin(const MatrixBase<Scalar, Derived1> &mat1, const MatrixBase<Scalar, Derived2> &mat2) +{ + return Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2>(mat1.ref(), mat2.ref()); + // Note that the above is equivalent to: + // return mat1.template cwise<CwiseMinOp>(mat2); +} + +int main(int, char**) +{ + Matrix4d m1 = Matrix4d::random(), m2 = Matrix4d::random(); + cout << cwiseMin(m1,m2) << endl; // use our new global operator + cout << m1.cwise<CwiseMinOp>(m2) << endl; // directly use the generic expression member + return 0; +} |