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# csutil/typetraits.h

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    00001 /*
    00002   Copyright (C) 2006 by Marten Svanfeldt
    00003
    00004   This library is free software; you can redistribute it and/or
    00005   modify it under the terms of the GNU Library General Public
    00006   License as published by the Free Software Foundation; either
    00007   version 2 of the License, or (at your option) any later version.
    00008
    00009   This library is distributed in the hope that it will be useful,
    00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012   Library General Public License for more details.
    00013
    00014   You should have received a copy of the GNU Library General Public
    00015   License along with this library; if not, write to the Free
    00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CSUTIL_TYPETRAITS_H__
    00020 #define __CSUTIL_TYPETRAITS_H__
    00021
    00027 namespace CS
    00028 {
    00029   namespace TypeTraits
    00030   {
    00031     namespace Implementation
    00032     {
    00033       // Types for checking yes/no
    00034
    00036       typedef char YesType;
    00037
    00039       struct NoType
    00040       {
    00041         char padding[8];
    00042       };
    00043
    00045       template <class T>
    00046       struct Wrap { Wrap () {} };
    00047
    00048       template <class T> T&(* IsReferenceHelper1(Wrap<T>) )(Wrap<T>);
    00049       char IsReferenceHelper1(...);
    00050
    00051       template <class T> NoType IsReferenceHelper2(T&(*)(Wrap<T>));
    00052       YesType IsReferenceHelper2(...);
    00053
    00054       template <class T>
    00055       struct IsReferenceImpl
    00056       {
    00057         static const bool value = sizeof(IsReferenceHelper2 (
    00058           IsReferenceHelper1 (Wrap<T>()))) == 1;
    00059       };
    00060
    00061
    00062       template <bool b1, bool b2, bool b3 = true, bool b4 = true, bool b5 = true,
    00063                 bool b6 = true, bool b7 = true>
    00064       struct TraitAnd;
    00065
    00066       template <bool b1, bool b2, bool b3, bool b4, bool b5, bool b6, bool b7>
    00067       struct TraitAnd
    00068       {
    00069         static const bool value = false;
    00070       };
    00071
    00072       template <>
    00073       struct TraitAnd<true, true, true, true, true, true, true>
    00074       {
    00075         static const bool value = true;
    00076       };
    00077
    00078       template <class T>
    00079       YesType IsSameTester(T*, T*);
    00080
    00081       NoType IsSameTester(...);
    00082
    00083       template <class T, class U>
    00084       struct IsSameImpl
    00085       {
    00086         static T* t;
    00087         static U* u;
    00088
    00089         static const bool value = TraitAnd<
    00090           sizeof(YesType) == sizeof(IsSameTester(t, u)),
    00091           IsReferenceImpl<T>::value == IsReferenceImpl<U>::value,
    00092           sizeof(T) == sizeof(U)>::value;
    00093       };
    00094     } // namespace Implementation
    00095
    00096
    00100     template <class Type>
    00101     struct IsReference
    00102     {
    00103       static const bool value = CS::TypeTraits::Implementation::IsReferenceImpl<Type>::value;
    00104     };
    00105
    00109     template <class Type1, class Type2>
    00110     struct IsSame
    00111     {
    00112       static const bool value = CS::TypeTraits::Implementation::IsSameImpl<Type1, Type2>::value;
    00113     };
    00114   } // namespace TypeTraits
    00115
    00116 } // namespace CS
    00117
    00118 #endif