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/* */
/* Copyright 1998-2005 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
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/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
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/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#ifndef VIGRA_FUNCTORTRAITS_HXX
#define VIGRA_FUNCTORTRAITS_HXX
#include <functional>
#include "metaprogramming.hxx"
namespace vigra {
struct InitializerTag {};
struct UnaryFunctorTag {};
struct BinaryFunctorTag {};
struct TernaryFunctorTag {};
struct UnaryAnalyserTag {};
struct BinaryAnalyserTag {};
struct TernaryAnalyserTag {};
struct UnaryReduceFunctorTag
: public InitializerTag, public UnaryAnalyserTag
{};
struct BinaryReduceFunctorTag
: public InitializerTag, public BinaryAnalyserTag
{};
typedef UnaryFunctorTag UnaryExpandFunctorTag;
typedef BinaryFunctorTag BinaryExpandFunctorTag;
template <class T>
class FunctorTraitsBase
{
public:
typedef T type;
typedef typename IsDerivedFrom<T, InitializerTag>::result isInitializer;
typedef typename IsDerivedFrom<T, UnaryFunctorTag>::result isUnaryFunctor;
typedef typename IsDerivedFrom<T, BinaryFunctorTag>::result isBinaryFunctor;
typedef typename IsDerivedFrom<T, TernaryFunctorTag>::result isTernaryFunctor;
typedef typename IsDerivedFrom<T, UnaryAnalyserTag>::result isUnaryAnalyser;
typedef typename IsDerivedFrom<T, BinaryAnalyserTag>::result isBinaryAnalyser;
typedef typename IsDerivedFrom<T, TernaryAnalyserTag>::result isTernaryAnalyser;
};
/** \addtogroup Functors
*/
//@{
/** \brief Export associated information for a functor.
The FunctorTraits class contains the following fields:
\code
template <class T>
struct FunctorTraits
{
typedef T type;
typedef ... isInitializer;
typedef ... isUnaryFunctor;
typedef ... isBinaryFunctor;
typedef ... isTernaryFunctor;
typedef ... isUnaryAnalyser;
typedef ... isBinaryAnalyser;
typedef ... isTernaryAnalyser;
};
\endcode
where the dots are either <tt>VigraTrueType</tt> or <tt>VigraFalseType</tt>
depending on whether the functor supports the respective functionality or not.
Note that these traits are automatically defined correctly when your functor is derived
from the appropriate functor tag classes:
\code
struct InitializerTag {};
struct UnaryFunctorTag {};
struct BinaryFunctorTag {};
struct TernaryFunctorTag {};
struct UnaryAnalyserTag {};
struct BinaryAnalyserTag {};
struct TernaryAnalyserTag {};
struct UnaryReduceFunctorTag : public InitializerTag, public UnaryAnalyserTag {};
struct BinaryReduceFunctorTag : public InitializerTag, public BinaryAnalyserTag {};
\endcode
If a functor <tt>f</tt> is a model of these categories, it supports the following
calls (<tt>v</tt> is a variable such that the result type of the functor
calls can be converted into <tt>v</tt>'s type, and <tt>a1, a2, a3</tt> are
variables convertible into the functor's argument types):
<DL>
<DT><b>Initializer</b>
<DD> <tt>v = f()</tt> (used with initImageWithFunctor())
<DT><b>UnaryFunctor</b>
<DD> <tt>v = f(a1)</tt> (used with transformImage())
<DT><b>BinaryFunctor</b>
<DD> <tt>v = f(a1, a2)</tt> (used with combineTwoImages())
<DT><b>TernaryFunctor</b>
<DD> <tt>v = f(a1, a2, a3)</tt> (used with combineThreeImages())
<DT><b>UnaryAnalyser</b>
<DD> <tt>f(a1)</tt> (return type <tt>void</tt>, used with inspectImage())
<DT><b>BinaryAnalyser</b>
<DD> <tt>f(a1, a2)</tt> (return type <tt>void</tt>, used with inspectTwoImages())
<DT><b>TernaryAnalyser</b>
<DD> <tt>f(a1, a2, a3)</tt> (return type <tt>void</tt>)
</DL>
It should be noted that the functor's argument and result types are not contained
in the traits class: Since the function calls are often member template functions in
VIGRA, many functors do not have fixed argument types. Neither are the result
types fixed in this case because they are computed (via a template meta-program)
from the argument types.
<b>\#include</b> \<vigra/functortraits.hxx\>
Namespace: vigra
*/
template <class T>
class FunctorTraits
: public FunctorTraitsBase<T>
{};
#define VIGRA_DEFINE_STL_FUNCTOR(name, unary, binary) \
template <class T> \
class FunctorTraits<name<T> > \
{ \
public: \
typedef T type; \
\
typedef VigraFalseType isInitializer; \
\
typedef unary isUnaryFunctor; \
typedef binary isBinaryFunctor; \
typedef VigraFalseType isTernaryFunctor; \
\
typedef VigraFalseType isUnaryAnalyser; \
typedef VigraFalseType isBinaryAnalyser; \
typedef VigraFalseType isTernaryAnalyser; \
};
// ???TODO: these should also be specialized for the ptr_fun and mem_fun_ptr wrappers
VIGRA_DEFINE_STL_FUNCTOR(std::plus, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::minus, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::multiplies, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::divides, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::modulus, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::equal_to, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::not_equal_to, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::greater, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::less, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::greater_equal, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::less_equal, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::logical_and, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::logical_or, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::binary_negate, VigraFalseType, VigraTrueType)
VIGRA_DEFINE_STL_FUNCTOR(std::negate, VigraTrueType, VigraFalseType)
VIGRA_DEFINE_STL_FUNCTOR(std::logical_not, VigraTrueType, VigraFalseType)
VIGRA_DEFINE_STL_FUNCTOR(std::unary_negate, VigraTrueType, VigraFalseType)
VIGRA_DEFINE_STL_FUNCTOR(std::binder1st, VigraTrueType, VigraFalseType)
VIGRA_DEFINE_STL_FUNCTOR(std::binder2nd, VigraTrueType, VigraFalseType)
#undef VIGRA_DEFINE_STL_FUNCTOR
template <class R>
class FunctorTraits<R (*)()>
{
public:
typedef R (*type)();
typedef VigraTrueType isInitializer;
typedef VigraFalseType isUnaryFunctor;
typedef VigraFalseType isBinaryFunctor;
typedef VigraFalseType isTernaryFunctor;
typedef VigraFalseType isUnaryAnalyser;
typedef VigraFalseType isBinaryAnalyser;
typedef VigraFalseType isTernaryAnalyser;
};
template <class R, class T>
class FunctorTraits<R (*)(T)>
{
public:
typedef R (*type)(T);
typedef VigraFalseType isInitializer;
typedef VigraTrueType isUnaryFunctor;
typedef VigraFalseType isBinaryFunctor;
typedef VigraFalseType isTernaryFunctor;
typedef VigraFalseType isUnaryAnalyser;
typedef VigraFalseType isBinaryAnalyser;
typedef VigraFalseType isTernaryAnalyser;
};
template <class R, class T1, class T2>
class FunctorTraits<R (*)(T1, T2)>
{
public:
typedef R (*type)(T1, T2);
typedef VigraFalseType isInitializer;
typedef VigraFalseType isUnaryFunctor;
typedef VigraTrueType isBinaryFunctor;
typedef VigraFalseType isTernaryFunctor;
typedef VigraFalseType isUnaryAnalyser;
typedef VigraFalseType isBinaryAnalyser;
typedef VigraFalseType isTernaryAnalyser;
};
template <class R, class T1, class T2, class T3>
class FunctorTraits<R (*)(T1, T2, T3)>
{
public:
typedef R (*type)(T1, T2, T3);
typedef VigraFalseType isInitializer;
typedef VigraFalseType isUnaryFunctor;
typedef VigraFalseType isBinaryFunctor;
typedef VigraTrueType isTernaryFunctor;
typedef VigraFalseType isUnaryAnalyser;
typedef VigraFalseType isBinaryAnalyser;
typedef VigraFalseType isTernaryAnalyser;
};
//@}
} // namespace vigra
#endif // VIGRA_FUNCTORTRAITS_HXX
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