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/**
* @file llalignedarray.h
* @brief A static array which obeys alignment restrictions and mimics std::vector accessors.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLALIGNEDARRAY_H
#define LL_LLALIGNEDARRAY_H
#include "llmemory.h"
#if LL_WINDOWS
#include "llvector4a.h" // for 16b fast copy
#endif
template <class T, U32 alignment>
class LLAlignedArray
{
public:
T* mArray;
U32 mElementCount;
U32 mCapacity;
LLAlignedArray();
~LLAlignedArray();
void push_back(const T& elem);
U32 size() const { return mElementCount; }
void resize(U32 size);
T* append(S32 N);
T& operator[](int idx);
const T& operator[](int idx) const;
};
template <class T, U32 alignment>
LLAlignedArray<T, alignment>::LLAlignedArray()
{
llassert(alignment >= 16);
mArray = NULL;
mElementCount = 0;
mCapacity = 0;
}
template <class T, U32 alignment>
LLAlignedArray<T, alignment>::~LLAlignedArray()
{
ll_aligned_free(mArray);
mArray = NULL;
mElementCount = 0;
mCapacity = 0;
}
template <class T, U32 alignment>
void LLAlignedArray<T, alignment>::push_back(const T& elem)
{
T* old_buf = NULL;
if (mCapacity <= mElementCount)
{
mCapacity++;
mCapacity *= 2;
T* new_buf = (T*) ll_aligned_malloc(mCapacity*sizeof(T), alignment);
if (mArray)
{
#if LL_WINDOWS
LLVector4a::memcpyNonAliased16((F32*) new_buf, (F32*) mArray, sizeof(T)*mElementCount);
#else
memcpy((F32*)new_buf, (F32*)mArray, sizeof(T)*mElementCount);
#endif
}
old_buf = mArray;
mArray = new_buf;
}
mArray[mElementCount++] = elem;
//delete old array here to prevent error on a.push_back(a[0])
ll_aligned_free(old_buf);
}
template <class T, U32 alignment>
void LLAlignedArray<T, alignment>::resize(U32 size)
{
if (mCapacity < size)
{
mCapacity = size+mCapacity*2;
T* new_buf = mCapacity > 0 ? (T*) ll_aligned_malloc(mCapacity*sizeof(T), alignment) : NULL;
if (mArray)
{
#if LL_WINDOWS
LLVector4a::memcpyNonAliased16((F32*) new_buf, (F32*) mArray, sizeof(T)*mElementCount);
#else
memcpy((F32*) new_buf, (F32*) mArray, sizeof(T)*mElementCount);
#endif
ll_aligned_free(mArray);
}
/*for (U32 i = mElementCount; i < mCapacity; ++i)
{
new(new_buf+i) T();
}*/
mArray = new_buf;
}
mElementCount = size;
}
template <class T, U32 alignment>
T& LLAlignedArray<T, alignment>::operator[](int idx)
{
llassert(idx < mElementCount);
return mArray[idx];
}
template <class T, U32 alignment>
const T& LLAlignedArray<T, alignment>::operator[](int idx) const
{
llassert(idx < mElementCount);
return mArray[idx];
}
template <class T, U32 alignment>
T* LLAlignedArray<T, alignment>::append(S32 N)
{
U32 sz = size();
resize(sz+N);
return &((*this)[sz]);
}
#endif
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