CommDataType.h

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///////////////////////////////////////////////////////////////////////////////
//
// File CommDataType.h
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// 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 restriction, including without limitation
// the rights to use, 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 OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Describes data types (using MPI_Datatype if available)
//
///////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_LIB_UTILITIES_COMMDATATYPE_H
#define NEKTAR_LIB_UTILITIES_COMMDATATYPE_H

#include <LibUtilities/BasicConst/NektarUnivTypeDefs.hpp>
#include <vector>

#ifdef NEKTAR_USE_MPI
#include <mpi.h>

namespace Nektar
{
namespace LibUtilities
{
typedef MPI_Datatype CommDataType;
}
}

#else

namespace Nektar
{
namespace LibUtilities
{
enum CommDataType
{
    MPI_INT,
    MPI_UNSIGNED,
    MPI_LONG,
    MPI_UNSIGNED_LONG,
    MPI_LONG_LONG,
    MPI_UNSIGNED_LONG_LONG,
    MPI_FLOAT,
    MPI_DOUBLE,
    MPI_LONG_DOUBLE
};
}
}
#endif

namespace Nektar
{
template <typename Dim, typename DataType> class Array;

namespace LibUtilities
{
int CommDataTypeGetSize(CommDataType);

template <class T> class CommDataTypeTraits
{
    LIB_UTILITIES_EXPORT static CommDataType type;

public:
    static CommDataType &GetDataType()
    {
        return type;
    }
    static void *GetPointer(T &val)
    {
        return &val;
    }
    static const void *GetPointer(const T &val)
    {
        return &val;
    }
    static int GetCount(const T &val)
    {
        return 1;
    }

    const static bool IsVector = false;
};

/**
 * Partial specialisation for vectors
 */
template <class elemT> class CommDataTypeTraits<std::vector<elemT> >
{
public:
    static CommDataType &GetDataType()
    {
        return CommDataTypeTraits<elemT>::GetDataType();
    }
    static void *GetPointer(std::vector<elemT> &val)
    {
        return &val[0];
    }
    static const void *GetPointer(const std::vector<elemT> &val)
    {
        return &val[0];
    }
    static int GetCount(const std::vector<elemT> &val)
    {
        return val.size();
    }
    const static bool IsVector = true;
};

/**
 * Partial specialisation for vectors
 */
template <class elemT> class CommDataTypeTraits<Array<OneD, elemT> >
{
public:
    static CommDataType &GetDataType()
    {
        return CommDataTypeTraits<elemT>::GetDataType();
    }
    static void *GetPointer(Array<OneD, elemT> &val)
    {
        return val.get();
    }
    static const void *GetPointer(const Array<OneD, elemT> &val)
    {
        return val.get();
    }
    static int GetCount(const Array<OneD, elemT> &val)
    {
        return val.num_elements();
    }
    const static bool IsVector = true;
};
}
}

#endif