functions.h

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/* Libmacro - A multi-platform, extendable macro and hotkey C library
  Copyright (C) 2013 Jonathan Pelletier, New Paradigm Software

  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.

  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 __cplusplus
    #pragma message "C++ support is required for extras module"
    #include "mcr/err.h"
#endif

#ifndef MCR_EXTRAS_FUNCTIONS_H_
#define MCR_EXTRAS_FUNCTIONS_H_

#include "mcr/base/base.h"

namespace mcr
{
template<typename T>
T &reference(void *pointer)
{
    mcr_dassert(pointer);
    return *reinterpret_cast<T *>(pointer);
}

template<typename rT, typename vT>
rT *offset(vT *valuePt)
{
    rT *r = nullptr;
    size_t diff = ((char *)&r->self) - ((char *)r);
    return reinterpret_cast<rT *>(((char *)valuePt) - diff);
}

template<typename rT, typename vT>
const rT *offset(const vT *valuePt)
{
    rT *r = nullptr;
    size_t diff = ((const char *)&r->self) - ((const char *)r);
    return reinterpret_cast<const rT *>(((const char *)valuePt) - diff);
}

template<typename T>
void *newDataMember()
{
    return new T();
}

template<typename T>
void deleteDataMember(void *dataPt)
{
    if (dataPt)
        delete reinterpret_cast<T *>(dataPt);
}

template<typename T>
void resetDataMember(void *dataPt)
{
    if (dataPt)
        reference<T>(dataPt) = T();
}

template<typename T>
mcr_DataMember doufu()
{
    return (mcr_DataMember) {
        .data = new T(), .deallocate = &deleteDataMember<T>
    };
}

extern MCR_API void throwError(const char *lineString, int errorNumber);
}

#endif