[Dune] [#1011] operator* in densevector used as dot product in dune-istl is not suitable for complex vectors

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FS#1011 - operator* in densevector used as dot product in dune-istl is not suitable for complex vectors
User who did this - Jö Fahlke (joe)

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More specifically, the distinction between fundamental type, complex, and
vector types can be done like this for the free function dot():

  template<class T>
  struct AlwaysVoid { typedef void type; }

  template<class T, class = void>
  struct IsVector : false_type {};

  template<class T>
  struct IsVector<T, typename AlwaysVoid<typename T::FieldType>::type>
  : true_type {};

  // fundamental type
  template<class A, class B>
  typename enable_if<!IsVector<A>::value,
                     PromotionTraits<A,B>::Result>::type
  dot(A a, B b) { /*...*/; }

  // complex (and combinations with fundamental types)
  template<class A, class B>
  std::complex<PromotionTraits<A,B>::Result>
  dot(std::complex<A> a, B b) { /*...*/; }

  template<class A, class B>
  std::complex<PromotionTraits<A,B>::Result>
  dot(A a, std::complex<B> b) { /*...*/; }

  template<class A, class B>
  std::complex<PromotionTraits<A,B>::Result>
  dot(std::complex<A> a, std::complex<B> b) { /*...*/; }

  // vectors
  template<class A, class B>
  PromotionTraits<typename A::FieldType, typename B::FieldType>::Result
  dot(A a, B b) { return a.dot(b); }


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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1011#comment3746

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