TypeTraits.h

/*
 * Copyright (C) 2005 Marc Boris Duerner
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef Pt_TypeTraits_h
#define Pt_TypeTraits_h

#include <Pt/Api.h>
#include <cstddef>

namespace Pt {

template <typename T>
struct TypeTraitsBase 
{
    typedef T Value;
    typedef const T ConstValue;
    typedef T& Reference;
    typedef const T& ConstReference;
    typedef T* Pointer;
    typedef const T* ConstPointer;
};

template <typename T>
struct TypeTraits : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 0;
    static const unsigned int isPointer = 0;
    static const unsigned int isReference = 0;
};

template <typename T>
struct TypeTraits<const T> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 1;
    static const unsigned int isPointer = 0;
    static const unsigned int isReference = 0;
};


template <typename T>
struct TypeTraits<T&> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 0;
    static const unsigned int isPointer = 0;
    static const unsigned int isReference = 1;
};


template <typename T>
struct TypeTraits<const T&> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 1;
    static const unsigned int isPointer = 0;
    static const unsigned int isReference = 1;
};


template <typename T>
struct TypeTraits<T*> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 0;
    static const unsigned int isPointer = 1;
    static const unsigned int isReference = 0;
};


template <typename T>
struct TypeTraits<const T*> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 1;
    static const unsigned int isPointer = 1;
    static const unsigned int isReference = 0;
};


template <typename T, std::size_t N>
struct TypeTraits<T[N]> : public TypeTraitsBase<T>
{
    static const unsigned int isConst = 0;
    static const unsigned int isPointer = 1;
    static const unsigned int isReference = 0;
};


template <>
struct TypeTraits<void>
{
    typedef void Value;
    typedef void ConstType;
    typedef void Reference;
    typedef void ConstReference;
    typedef void* Pointer;
    typedef void* ConstPointer;

    static const unsigned int isConst = 0;
    static const unsigned int isPointer = 0;
    static const unsigned int isReference = 0;
};


template <typename T>
struct IntTraits
{};
    
template <>
struct IntTraits<signed char>
{
    typedef unsigned char Unsigned;
    typedef signed char Signed;

    static const unsigned int isSigned = 1;
};

template <>
struct IntTraits<unsigned char>
{
    typedef unsigned char Unsigned;
    typedef signed char Signed;

    static const unsigned int isSigned = 0;
};

template <>
struct IntTraits<short>
{
    typedef unsigned short Unsigned;
    typedef signed short Signed;

    static const unsigned int isSigned = 1;
};

template <>
struct IntTraits<unsigned short>
{
    typedef unsigned short Unsigned;
    typedef signed short Signed;

    static const unsigned int isSigned = 0;
};

template <>
struct IntTraits<int>
{
    typedef unsigned int Unsigned;
    typedef signed int Signed;

    static const unsigned int isSigned = 1;
};
 
template <>
struct IntTraits<unsigned int>
{
    typedef unsigned int Unsigned;
    typedef signed int Signed;

    static const unsigned int isSigned = 0;
};

template <>
struct IntTraits<long>
{
    typedef unsigned long Unsigned;
    typedef signed long Signed;

    static const unsigned int isSigned = 1;
};

template <>
struct IntTraits<unsigned long>
{
    typedef unsigned long Unsigned;
    typedef signed long Signed;

    static const unsigned int isSigned = 0;
};

template <>
struct IntTraits<long long>
{
    typedef unsigned long long Unsigned;
    typedef signed long long Signed;

    static const unsigned int isSigned = 1;
};

template <>
struct IntTraits<unsigned long long>
{
    typedef unsigned long long Unsigned;
    typedef signed long long Signed;

    static const unsigned int isSigned = 0;
};

} // namespace Pt

#endif // Pt_TypeTraits_h