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// functions for aligned memory allocation
// Copyright (C) 2009 Tim Blechmann
//
// This program 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.
//
// This program 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 this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#pragma once
#include <cstdlib>
#include <cstring>
#include <new> // for std::bad_alloc
#include <utility> // for std::forward
#include <boost/align/aligned_alloc.hpp>
#include "function_attributes.h"
namespace nova {
const int malloc_memory_alignment = 64;
inline void* MALLOC ASSUME_ALIGNED(64) malloc_aligned(std::size_t bytes) {
return boost::alignment::aligned_alloc(malloc_memory_alignment, bytes);
}
inline void free_aligned(void* ptr) { return boost::alignment::aligned_free(ptr); }
inline void* MALLOC ASSUME_ALIGNED(64) calloc_aligned(std::size_t bytes) {
void* ret = malloc_aligned(bytes);
if (ret)
std::memset(ret, 0, bytes);
return ret;
}
template <typename T> T* MALLOC ASSUME_ALIGNED(64) malloc_aligned(std::size_t n) {
return static_cast<T*>(malloc_aligned(n * sizeof(T)));
}
template <typename T> T* MALLOC ASSUME_ALIGNED(64) calloc_aligned(std::size_t n) {
return static_cast<T*>(calloc_aligned(n * sizeof(T)));
}
/** smart-pointer, freeing the managed pointer via free_aligned */
template <class T, bool managed = true> class aligned_storage_ptr {
public:
explicit aligned_storage_ptr(T* p = 0): ptr(p) {}
explicit aligned_storage_ptr(size_t count): ptr(malloc_aligned<T>(count)) {}
~aligned_storage_ptr(void) {
if (managed && ptr)
free_aligned(ptr);
}
void reset(T* p = 0) {
if (managed && ptr)
free_aligned(ptr);
ptr = p;
}
T& operator*() const { return *ptr; }
T* operator->() const { return ptr; }
T* get() const { return ptr; }
aligned_storage_ptr& operator=(T* p) {
reset(p);
return *this;
}
operator bool() const { return bool(ptr); }
void swap(aligned_storage_ptr& b) {
T* p = ptr;
ptr = b.ptr;
b.ptr = p;
}
private:
T* ptr;
};
} /* namespace nova */
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