CUnaryFunctor.h

#pragma once

#if defined(CUnaryFunctor_RECURSES)
#error Recursive header files inclusion detected in CUnaryFunctor.h
#else // defined(CUnaryFunctor_RECURSES)

#define CUnaryFunctor_RECURSES

#if !defined CUnaryFunctor_h

#define CUnaryFunctor_h

// Inclusions
#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/base/ConceptUtils.h"

namespace DGtal
{
  namespace concepts
  {
  // class CUnaryFunctor
  template <typename X, typename A, typename R>
  struct CUnaryFunctor : boost::Assignable<X>
  {

    // ----------------------- Concept checks ------------------------------
  public:

    BOOST_CONCEPT_USAGE( CUnaryFunctor )
    {
      // x( a ) returns r.
      ConceptUtils::sameType( r, x.operator() ( a ) );
    }
    // ------------------------- Private Datas --------------------------------
  private:
    X x;
    A a;
    R r;
    // ------------------------- Internals ------------------------------------
  private:

  }; // end of concept CUnaryFunctor

  //specialization for references
  template <typename X, typename A, typename R>
  struct CUnaryFunctor<X, A&, R&> : boost::Assignable<X>
  {

    // ----------------------- Concept checks ------------------------------
  public:

    BOOST_CONCEPT_USAGE( CUnaryFunctor )
    {
      ConceptUtils::sameType( getRef(r), x.operator() ( getRef(a) ) );
    }
    // ------------------------- Private Datas --------------------------------
  private:
    X x;
    A a;
    R r;
    // ------------------------- Internals ------------------------------------
  private:
    template<typename T>
    T& getRef(T& t) 
    {
      return t; 
    }

  }; // end of concept CUnaryFunctor
  }
} // namespace DGtal

//                                                                           //

#endif // !defined CUnaryFunctor_h

#undef CUnaryFunctor_RECURSES
#endif // else defined(CUnaryFunctor_RECURSES)