prim_allocator.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
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 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */
#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_IMPL_ALLOCATOR_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_IMPL_ALLOCATOR_H

#include "../prim_common.h"
#include "../../meta/is_integral.h"
#include "../../meta/is_trivial.h"

namespace lass
{
namespace prim
{
namespace impl
{

LASS_DLL void* allocateMemory(size_t size);
LASS_DLL void deallocateMemory(void* mem, size_t size);

template <typename T, bool hasTrivialConstructorAndDestructor>
class AllocatorHelper
{
public:
    static T* allocate(size_t n)
    {
        return static_cast<T*>(allocateMemory(n * sizeof(T)));
    }
    static void deallocate(T* p, size_t n)
    {
        deallocateMemory(p, n * sizeof(T));
    }
};

template <typename T>
class AllocatorHelper<T, false>
{
public:
    static T* allocate(size_t n)
    {
        // Kids, don't try this at home, we're trained professionals here! ;)
        //
        T* p = static_cast<T*>(allocateMemory(n * sizeof(T)));
        for (size_t i = 0; i < n; ++i)
        {
            try
            {
                new(&p[i]) T();
            }
            catch (...)
            {
                deallocate(p, n, i);
                throw;
            }
        }
        return p;
    }
    static void deallocate(T* p, size_t n)
    {
        deallocate(p, n, n);
    }
private:
    static void deallocate(T* p, size_t n, size_t i)
    {
        while (i > 0)
        {
            p[--i].~T();
        }
        deallocateMemory(p, n * sizeof(T));
    }
};

template <typename T>
T* allocateArray(size_t n)
{
    return AllocatorHelper<T, meta::IsTrivial<T>::value>::allocate(n);
}

template <typename T>
void deallocateArray(T* p, size_t n)
{
    AllocatorHelper<T, meta::IsTrivial<T>::value>::deallocate(p, n);
}


}
}
}

#endif

// EOF