itkConceptChecking.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConceptChecking.h,v $
  Language:  C++
  Date:      $Date: 2007-12-08 17:16:01 $
  Version:   $Revision: 1.30 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

  Portions of this code are covered under the VTK copyright.
  See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkConceptChecking_h
#define __itkConceptChecking_h

#include "itkPixelTraits.h"
#include "itkNumericTraits.h"
#include <iostream>

#ifndef ITK_CONCEPT_NO_CHECKING
#  if defined(_MSC_VER) && !defined(__ICL)
#    define ITK_CONCEPT_IMPLEMENTATION_VTABLE
#  elif defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)
#    define ITK_CONCEPT_IMPLEMENTATION_VTABLE
#  elif defined(__MWERKS__) && (__MWERKS__ <= 0x3002)
#    define ITK_CONCEPT_IMPLEMENTATION_VTABLE
#  elif defined(__SUNPRO_CC)
#    define ITK_CONCEPT_IMPLEMENTATION_VTABLE
#  else
#    define ITK_CONCEPT_IMPLEMENTATION_STANDARD
#  endif
#endif

#if defined(ITK_CONCEPT_IMPLEMENTATION_STANDARD)

// Leave ()'s off the sizeof to force the caller to pass them in the
// concept argument of the itkConceptMacro.  This is necessary because
// the argument may contain commas.
#  define itkConceptConstraintsMacro() \
    template <void (Constraints::*)()> struct Enforcer {}; \
    typedef Enforcer<&Constraints::constraints> EnforcerInstantiation
#  define itkConceptMacro(name, concept) enum { name = sizeof concept }

#elif defined(ITK_CONCEPT_IMPLEMENTATION_VTABLE)

#  define itkConceptConstraintsMacro() \
    virtual void Enforcer() { &Constraints::constraints; }
#  define itkConceptMacro(name, concept) enum { name = sizeof concept }


#elif defined(ITK_CONCEPT_IMPLEMENTATION_CALL)

#  define itkConceptConstraintsMacro()
#  define itkConceptMacro(name, concept) enum { name = 0 }

#else

#  define itkConceptConstraintsMacro()
#  define itkConceptMacro(name, concept) enum { name = 0 }

#endif

namespace itk
{

namespace Concept
{

namespace Detail
{

template <typename T> struct UniqueType {};
template <int> struct UniqueType_int {};
template <unsigned int> struct UniqueType_unsigned_int {};
template <bool> struct UniqueType_bool {};


template <typename T> inline void IgnoreUnusedVariable(T) {}

template <class T>
void RequireBooleanExpression(const T& t)
{
  bool x = t;
  IgnoreUnusedVariable(x);
}

} // namespace Detail


template <typename T>
struct DefaultConstructible
{
  struct Constraints
  {
    void constraints()
      {
      T a;
      Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct CopyConstructible
{
  struct Constraints
  {
    void constraints()
      {
      T a(b);
      T* p = &a;
      const_constraints(a);
      Detail::IgnoreUnusedVariable(p);
      }
    void const_constraints(const T& a)
      {
      T c(a);
      const T* p = &a;
      Detail::IgnoreUnusedVariable(c);
      Detail::IgnoreUnusedVariable(p);
      }
    T b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2>
struct Convertible
{
  struct Constraints
  {
    void constraints()
      {
      T2 b = static_cast<T2>(a);
      Detail::IgnoreUnusedVariable(b);
      }
    T1 a;
  };
  itkConceptConstraintsMacro();
};

template <typename T>
struct Assignable
{
  struct Constraints
  {
    void constraints()
      {
      a = a;
      const_constraints(a);
      }
    void const_constraints(const T& b)
      {
      a = b;
      }
    T a;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1>
struct LessThanComparable
{
  struct Constraints
  {
    void constraints()
      {
      Detail::RequireBooleanExpression(a < b);
      Detail::RequireBooleanExpression(a <= b);
      }
    T1 a;
    T2 b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1>
struct GreaterThanComparable
{
  struct Constraints
  {
    void constraints()
      {
      Detail::RequireBooleanExpression(a > b);
      Detail::RequireBooleanExpression(a >= b);
      }
    T1 a;
    T2 b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1>
struct EqualityComparable
{
  struct Constraints
  {
    void constraints()
      {
      Detail::RequireBooleanExpression(a == b);
      Detail::RequireBooleanExpression(a != b);
      }
    T1 a;
    T2 b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1>
struct Comparable
{
  struct Constraints
  {
    void constraints()
      {
      Detail::RequireBooleanExpression(a < b);
      Detail::RequireBooleanExpression(a > b);
      Detail::RequireBooleanExpression(a <= b);
      Detail::RequireBooleanExpression(a >= b);
      Detail::RequireBooleanExpression(a == b);
      Detail::RequireBooleanExpression(a != b);
      }
    T1 a;
    T2 b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1, typename T3=T1>
struct AdditiveOperators
{
  struct Constraints
  {
    void constraints()
      {
      a = static_cast<T3>(b + c);
      a = static_cast<T3>(b - c);
      a += static_cast<T3>(c);
      a -= static_cast<T3>(c);
      const_constraints(b, c);
      }
    void const_constraints(const T1& d, const T2& e)
      {
      a = static_cast<T3>(d + e);
      a = static_cast<T3>(d - e);
      a += static_cast<T3>(e);
      a -= static_cast<T3>(e);
      }
    T3 a;
    T1 b;
    T2 c;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1, typename T3=T1>
struct MultiplyOperator
{
  struct Constraints
  {
    void constraints()
      {
      a = static_cast<T3>(b * c);
      const_constraints(b, c);
      }
    void const_constraints(const T1& d, const T2& e)
      {
      a = static_cast<T3>(d * e);
      }
    T3 a;
    T1 b;
    T2 c;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1>
struct MultiplyAndAssignOperator
{
  struct Constraints
  {
    void constraints()
      {
      a *= static_cast<T2>(b);
      const_constraints(b);
      }
    void const_constraints(const T1& d)
      {
      a *= static_cast<T2>(d);
      }
    T2 a;
    T1 b;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1, typename T3=T1>
struct DivisionOperators
{
  struct Constraints
  {
    void constraints()
      {
      a = static_cast<T3>(b / c);
      a /= c;
      const_constraints(b, c);
      }
    void const_constraints(const T1& d, const T2& e)
      {
      a = static_cast<T3>(d / e);
      a /= e;
      }
    T3 a;
    T1 b;
    T2 c;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1, typename T3=T1>
struct LogicalOperators
{
  struct Constraints
  {
    void constraints()
      {
      a = static_cast<T3>(b & c);
      a = static_cast<T3>(b | c);
      a = static_cast<T3>(b ^ c);
      a &= static_cast<T3>(c);
      a |= static_cast<T3>(c);
      a ^= static_cast<T3>(c);
      const_constraints(b, c);
      }
    void const_constraints(const T1& d, const T2& e)
      {
      a = static_cast<T3>(d & e);
      a = static_cast<T3>(d | e);
      a = static_cast<T3>(d ^ e);
      a &= static_cast<T3>(e);
      a |= static_cast<T3>(e);
      a ^= static_cast<T3>(e);
      }
    T3 a;
    T1 b;
    T2 c;
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2=T1, typename T3=T1>
struct BracketOperator
{
  struct Constraints
  {
    void constraints()
      {
      a = static_cast<T3>(b [ c ]);
      const_constraints(b, c);
      }
    void const_constraints(const T1& d, const T2& e)
      {
      a = static_cast<T3>(b [ c ]);
      }
    T3 a;
    T1 b;
    T2 c;
  };

  itkConceptConstraintsMacro();
};


template <typename T>
struct NotOperator
{
  struct Constraints
  {
    void constraints()
      {
      a = !a;
      }
    T a;
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct IncrementDecrementOperators
{
  struct Constraints
  {
    void constraints()
      {
        a++;
        a--;
        ++a;
        --a;
      }
    T a;
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct OStreamWritable
{
  struct Constraints
  {
    void constraints()
      {
        std::cout << a;
      }
    T a;
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct Signed
{
  typedef Signed Self;
  itkStaticConstMacro(IsSigned, bool, NumericTraits<T>::is_signed);
  struct Constraints
  {
    typedef Detail::UniqueType_bool<true> TrueT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(IsSigned)> SignedT;
    void constraints()
      {
        SignedT a = TrueT();
        Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};
  
template <typename T1, typename T2>
struct SameType
{
  struct Constraints
  {
    void constraints()
      {
        Detail::UniqueType<T1> a = Detail::UniqueType<T2>();
        Detail::IgnoreUnusedVariable(a);
      }
  };
  itkConceptConstraintsMacro();
};

template <unsigned int D1, unsigned int D2>
struct SameDimension
{
  struct Constraints
  {
    typedef Detail::UniqueType_unsigned_int<D1> DT1;
    typedef Detail::UniqueType_unsigned_int<D2> DT2;
    void constraints()
      {
        DT1 a = DT2();
        Detail::IgnoreUnusedVariable(a);
      }
  };
  itkConceptConstraintsMacro();
};

template <typename T>
struct HasNumericTraits
{
  struct Constraints
  {
    void constraints()
      { 
        typedef typename NumericTraits<T>::ValueType ValueType;
        typedef typename NumericTraits<T>::PrintType PrintType;
        typedef typename NumericTraits<T>::AbsType AbsType;
        typedef typename NumericTraits<T>::AccumulateType AccumulateType;
        typedef typename NumericTraits<T>::RealType RealType;
        typedef typename NumericTraits<T>::ScalarRealType ScalarRealType;
        typedef typename NumericTraits<T>::FloatType FloatType;
        T a;
        bool b;
        a = NumericTraits<T>::Zero;
        a = NumericTraits<T>::One;
        a = NumericTraits<T>::NonpositiveMin();
        a = NumericTraits<T>::ZeroValue();
        b = NumericTraits<T>::IsPositive(a);
        b = NumericTraits<T>::IsNonpositive(a);
        b = NumericTraits<T>::IsNegative(a);
        b = NumericTraits<T>::IsNonnegative(a);
        Detail::IgnoreUnusedVariable(a);
        Detail::IgnoreUnusedVariable(b);
      }
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct HasPixelTraits
{
  struct Constraints
  {
    void constraints()
      { 
      typedef typename PixelTraits<T>::ValueType ValueType;
      unsigned int a = PixelTraits<T>::Dimension;
      Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};

template <typename T>
struct HasValueType
{
  struct Constraints
  {
    void constraints()
      { 
      typedef typename T::ValueType ValueType;
      }
  };

  itkConceptConstraintsMacro();
};


template <typename T>
struct HasZero
{
  struct Constraints
  {
    void constraints()
      { 
      T a;
      a = NumericTraits<T>::Zero;
      Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};

template <typename T1, typename T2>
struct HasJoinTraits
{
  struct Constraints
  {
    void constraints()
      { 
        typedef typename JoinTraits<T1, T2>::ValueType ValueType;
      }
  };

  itkConceptConstraintsMacro();
};

template <unsigned int D1, unsigned int D2>
struct SameDimensionOrMinusOne
{
  struct Constraints
  {
    typedef Detail::UniqueType_unsigned_int< D1 > Type1;
    typedef Detail::UniqueType_unsigned_int< D1-1 > Type2;

    void f( Type1 ) {}
    void f( Type2, int = 0 ) {}

    void constraints()
      {
      Detail::UniqueType_unsigned_int< D2 > tt;
      this->f( tt );
      }
  };
  itkConceptConstraintsMacro();
};

template <typename T>
struct IsInteger
{
  typedef IsInteger Self;
  itkStaticConstMacro(Integral, bool, NumericTraits<T>::is_integer);
  struct Constraints
  {
    typedef Detail::UniqueType_bool<true> TrueT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(Integral)> IntegralT;
    void constraints()
      {
        IntegralT a = TrueT();
        Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};
  
template <typename T>
struct IsNonInteger
{
  typedef IsNonInteger Self;
  itkStaticConstMacro(NonIntegral, bool, NumericTraits<T>::is_integer);
  struct Constraints
  {
    typedef Detail::UniqueType_bool<false> FalseT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(NonIntegral)> NonIntegralT;
    void constraints()
      {
        NonIntegralT a = FalseT();
        Detail::IgnoreUnusedVariable(a);
      }
  };

  itkConceptConstraintsMacro();
};
  
template <typename T>
struct IsFloatingPoint
{
  typedef IsFloatingPoint Self;
  itkStaticConstMacro(Integral, bool, NumericTraits<T>::is_integer);
  itkStaticConstMacro(IsExact, bool, NumericTraits<T>::is_exact);
  struct Constraints
  {
    typedef Detail::UniqueType_bool<false> FalseT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(Integral)> IntegralT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(IsExact)> ExactT;
    void constraints()
      {
        IntegralT a = FalseT();
        ExactT b = FalseT();
        Detail::IgnoreUnusedVariable(a);
        Detail::IgnoreUnusedVariable(b);
      }
  };

  itkConceptConstraintsMacro();
};
  
template <typename T>
struct IsFixedPoint
{
  typedef IsFixedPoint Self;
  itkStaticConstMacro(Integral, bool, NumericTraits<T>::is_integer);
  itkStaticConstMacro(IsExact, bool, NumericTraits<T>::is_exact);
  struct Constraints
  {
    typedef Detail::UniqueType_bool<true> TrueT;
    typedef Detail::UniqueType_bool<false> FalseT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(Integral)> IntegralT;
    typedef Detail::UniqueType_bool<itkGetStaticConstMacro(IsExact)> ExactT;
    void constraints()
      {
        IntegralT a = FalseT();
        ExactT b = TrueT();
        Detail::IgnoreUnusedVariable(a);
        Detail::IgnoreUnusedVariable(b);
      }
  };

  itkConceptConstraintsMacro();
};
  
} // end namespace Concept

} // end namespace itk

#endif

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