callable.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_FUNCTIONS_COMMON_CALLABLE_HH
#define DUNE_FUNCTIONS_COMMON_CALLABLE_HH
 
#include <memory>
#include <functional>
 
#include <dune/common/function.hh>
#include <dune/common/shared_ptr.hh>
 
 
namespace Dune {
namespace Functions {
 
 
 
 
template<class F>
class CallableFunctionWrapper
{
    using Range = typename F::RangeType;
    using Domain = typename F::DomainType;
 
  public:
 
    CallableFunctionWrapper(const F& f)
    {
      f_ = Dune::stackobject_to_shared_ptr(f);
    }
 
    CallableFunctionWrapper(const std::shared_ptr<const F>& f) :
      f_(f)
    {}
 
    Range operator()(const Domain& x) const
    {
      Range y;
      f_->evaluate(x, y);
      return y;
    }
 
  private:
    std::shared_ptr<const F> f_;
};
 
 
 
template<class F>
CallableFunctionWrapper<F> callable(const F& f)
{
  return CallableFunctionWrapper<F>(f);
}
 
 
template<class F>
CallableFunctionWrapper<F> callable(const std::shared_ptr<F>& fp)
{
  return CallableFunctionWrapper<F>(fp);
}
 
 
 
} // namespace Functions
} // namespace Dune
 
#endif //DUNE_FUNCTIONS_COMMON_CALLABLE_HH