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3 #ifndef DUNE_PRECONDITIONER_HH
4 #define DUNE_PRECONDITIONER_HH
25 template<
class X,
class Y>
50 virtual void pre (X& x, Y& b) = 0;
62 virtual void apply (X& v,
const Y& d) = 0;
72 virtual void post (X& x) = 0;