[Dune] [#597] Add basic interfaces with and without virtual methods for functions/mappings

[Dune]

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User who did this - Carsten Gräser (Carsten) 

Attached to Project - Dune
Summary - Add basic interfaces with and without virtual methods for functions/mappings
Task Type - Feature Request
Category - Common
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - While there are several places (BoundarySegment, interpolate() in dune-localfunctions, various discretization modules) where mappings are used there is now common interface/base class for this purpose. Currently there are almost all combinations of eval()/evaluate()/operator(), virtual/non-virtual and return value/call by reference used.

I suggest to introduce a simple base classes with and without virtual functions to provide a common interface. The place for this should be dune-common and it could look like

template <class X, class Y>
class FunctionBase
{
  public:
    Y evaluate(const X& x);
};

teplate <class X,class Y>
class VirtualFunctionBase :public FunctionBase<X,Y>
{
  public:
    virtual Y evaluate(const X& x);
};

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=597

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