Re: [eigen] Overloading componentwise binary operators for vectors

[Gael Guennebaud <gael.guennebaud@xxxxxxxxx>]

On Fri, Oct 2, 2015 at 10:25 PM, Cedric Doucet <cedric.doucet@xxxxxxxx> wrote:

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template<typename ScalarType>

Vector<ScalarType> operator+(Vector<ScalarType> const & lhs, Vector<ScalarType> const & rhs)

{ return lhs.wrapped_ + right.wrapped_; }

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does not work. I guess it is because an _expression_ template is returned by operator + in Eigen..

This should work if your Vector class has a template constructor from an Eigen::DenseBase<Derived>. Of course, this way you will loose the benefits of Eigen's _expression_ templates.

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erreur: ambiguous overload for ‘operator+’ (operand types are ‘Vector<double>’ and ‘Vector<double>’)
CPPUNIT_ASSERT_EQUAL(sum, left+right);
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Please show what are the multiple versions of operator+ found by the compiler.

Anyways, instead of writing a wrapper, maybe extending MatrixBase<> to add compatibility methods or inherit Matrix<> could work for you? See:

http://eigen.tuxfamily.org/dox-devel/TopicCustomizingEigen.html

gael