[eigen] MatrixBase::swap -- why const?

[eigen] MatrixBase::swap -- why const?

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To: eigen@xxxxxxxxxxxxxxxxxxx
Subject: [eigen] MatrixBase::swap -- why const?
From: Mark Borgerding <mark@xxxxxxxxxxxxxx>
Date: Thu, 04 Jun 2009 11:23:46 -0400

I'm struggling to understand
   template<typename OtherDerived/*, int OtherMode*/>
   void swap(const MatrixBase<OtherDerived>& other)

Why is "other" a const reference? It is modified by the call, no?
This seems like a violation of interface contract.

Follow-Ups:
- Re: [eigen] MatrixBase::swap -- why const?
  - From: Benoit Jacob

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