BinaryComposeFunctionAdapter.h

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// $Maintainer: Stephan Aiche $
// $Authors: Anton Pervukhin <Anton.Pervukhin@CeBiTec.Uni-Bielefeld.DE> $
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#ifndef OPENMS_CONCEPT_BINARYCOMPOSEFUNCTIONADAPTER_H
#define OPENMS_CONCEPT_BINARYCOMPOSEFUNCTIONADAPTER_H

#include <functional>

namespace OpenMS
{

  template <class OP1, class OP2, class OP3>
  class BinaryComposeFunctionAdapter :
    public std::binary_function<typename OP2::argument_type,
                                typename OP3::argument_type,
                                typename OP1::result_type>
  {
private:
    OP1 op1_;    // process: op1(op2(x),op3(y))
    OP2 op2_;
    OP3 op3_;
public:
    BinaryComposeFunctionAdapter(const OP1 & o1, const OP2 & o2, const OP3 & o3) :
      op1_(o1), op2_(o2), op3_(o3)
    {
    }

    typename OP1::result_type
    operator()(const typename OP2::argument_type & x,
               const typename OP3::argument_type & y) const
    {
      return op1_(op2_(x), op3_(y));
    }

  };

  template <class OP1, class OP2, class OP3>
  inline BinaryComposeFunctionAdapter<OP1, OP2, OP3>
  binaryCompose(const OP1 & o1, const OP2 & o2, const OP3 & o3)
  {
    return BinaryComposeFunctionAdapter<OP1, OP2, OP3>(o1, o2, o3);
  }

} // namespace OpenMS

#endif // OPENMS_CONCEPT_BINARYCOMPOSEFUNCTIONADAPTER_H