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/*
* This file is part of libcxxsupport.
*
* libcxxsupport is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* libcxxsupport 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libcxxsupport; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* libcxxsupport is being developed at the Max-Planck-Institut fuer Astrophysik
* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
* (DLR).
*/
/*! \file alloc_utils.h
* Classes providing raw memory allocation and deallocation support.
*
* Copyright (C) 2011-2015 Max-Planck-Society
* \author Martin Reinecke
*/
#ifndef PLANCK_ALLOC_UTILS_H
#define PLANCK_ALLOC_UTILS_H
#include <cstdlib>
#include <cstddef>
#include "datatypes.h"
template <typename T> class normalAlloc__
{
public:
static T *alloc(tsize sz) { return (sz>0) ? new T[sz] : 0; }
static void dealloc (T *ptr) { delete[] ptr; }
};
template <typename T, int align> class alignAlloc__
{
private:
//#if (__cplusplus>=201103L)
// enum { max_nat_align = alignof(std::max_align_t) };
//#else
enum { max_nat_align = sizeof(void *) };
//#endif
public:
static T *alloc(tsize sz)
{
using namespace std;
if (sz==0) return 0;
planck_assert((align&(align-1))==0,"alignment must be power of 2");
void *res;
if (align<=max_nat_align)
{
res=malloc(sz*sizeof(T));
planck_assert(res!=0,"error in malloc()");
}
else
{
tsize overhead=align-1+sizeof(void*);
void *ptr=malloc(sz*sizeof(T)+overhead);
planck_assert(ptr!=0,"error in malloc()");
tsize sptr=reinterpret_cast<tsize>(ptr);
sptr = (sptr+overhead) & ~(align-1);
void **ptr2 = reinterpret_cast<void **>(sptr);
ptr2[-1]=ptr;
res=ptr2;
}
return static_cast<T *>(res);
}
static void dealloc(T *ptr)
{
using namespace std;
if (align<=max_nat_align)
free(ptr);
else
{
if (ptr==0) return;
void **ptr2 = reinterpret_cast<void **>(ptr);
free (ptr2[-1]);
}
}
};
#endif
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