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friend of class in anonymous namespace removed

Simon Praetorius requested to merge simon.praetorius/dune-functions:issue/anonymous_friend into master

Summary

An anynomous namespace is replaced with the named namespace Impl.

Motivation

There is a problem, when declaring a class as friend that is defined in an anonymous namespace. Depending on which of the classes is a template, either to one or the other compiler gives an error about inaccessible members. So, I have simply replaced the anonymous namespace with namespace Impl.

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