UnaryComposeFunctionAdapter.h

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// $Maintainer: Timo Sachsenberg $
// $Authors: Anton Pervukhin <Anton.Pervukhin@CeBiTec.Uni-Bielefeld.DE> $
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#ifndef OPENMS_CONCEPT_UNARYCOMPOSEFUNCTIONADAPTER_H
#define OPENMS_CONCEPT_UNARYCOMPOSEFUNCTIONADAPTER_H

#include <functional>

namespace OpenMS
{

  template <class OP1, class OP2>
  class UnaryComposeFunctionAdapter :
    public std::unary_function<typename OP2::argument_type, typename OP1::result_type>
  {
private:
    OP1 op1_;    // process: op1(op2(x))
    OP2 op2_;
public:
    UnaryComposeFunctionAdapter(const OP1 & o1, const OP2 & o2) :
      op1_(o1), op2_(o2)
    {
    }

    typename OP1::result_type
    operator()(const typename OP2::argument_type & x) const
    {
      return op1_(op2_(x));
    }

  };

  template <class OP1, class OP2>
  inline UnaryComposeFunctionAdapter<OP1, OP2>
  unaryCompose(const OP1 & o1, const OP2 & o2)
  {
    return UnaryComposeFunctionAdapter<OP1, OP2>(o1, o2);
  }

} // namespace OpenMS

#endif // OPENMS_CONCEPT_UNARYCOMPOSEFUNCTIONADAPTER_H