BulletCollision/Gimpact/gim_array.h

#ifndef GIM_ARRAY_H_INCLUDED
#define GIM_ARRAY_H_INCLUDED
/*! \file gim_array.h
\author Francisco Leon Najera
*/
/*
-----------------------------------------------------------------------------
This source file is part of GIMPACT Library.

For the latest info, see http://gimpact.sourceforge.net/

Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
email: projectileman (at) yahoo.com

 This library is free software; you can redistribute it and/or
 modify it under the terms of EITHER:
   (1) 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. The text of the GNU Lesser
       General Public License is included with this library in the
       file GIMPACT-LICENSE-LGPL.TXT.
   (2) The BSD-style license that is included with this library in
       the file GIMPACT-LICENSE-BSD.TXT.
   (3) The zlib/libpng license that is included with this library in
       the file GIMPACT-LICENSE-ZLIB.TXT.

 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 files
 GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.

-----------------------------------------------------------------------------
*/

#include "gim_memory.h"


#define GIM_ARRAY_GROW_INCREMENT 2
#define GIM_ARRAY_GROW_FACTOR 2

//!	Very simple array container with fast access and simd memory
template<typename T>
class gim_array
{
public:
//! properties
//!@{
    T *m_data;
    GUINT m_size;
    GUINT m_allocated_size;
//!@}
//! protected operations
//!@{

    inline void destroyData()
	{
	    m_allocated_size = 0;
		if(m_data==NULL) return;
		gim_free(m_data);
		m_data = NULL;
	}

	inline bool resizeData(GUINT newsize)
	{
		if(newsize==0)
		{
			destroyData();
			return true;
		}

		if(m_size>0)
		{
            m_data = (T*)gim_realloc(m_data,m_size*sizeof(T),newsize*sizeof(T));
		}
		else
		{
		    m_data = (T*)gim_alloc(newsize*sizeof(T));
		}
		m_allocated_size = newsize;
		return true;
	}

	inline bool growingCheck()
	{
		if(m_allocated_size<=m_size)
		{
		    GUINT requestsize = m_size;
		    m_size = m_allocated_size;
			if(resizeData((requestsize+GIM_ARRAY_GROW_INCREMENT)*GIM_ARRAY_GROW_FACTOR)==false) return false;
		}
		return true;
	}

//!@}
//! public operations
//!@{
    inline  bool reserve(GUINT size)
    {
        if(m_allocated_size>=size) return false;
        return resizeData(size);
    }

    inline void clear_range(GUINT start_range)
    {
        while(m_size>start_range)
        {
            m_data[--m_size].~T();
        }
    }

    inline void clear()
    {
        if(m_size==0)return;
        clear_range(0);
    }

    inline void clear_memory()
    {
        clear();
        destroyData();
    }

    gim_array()
    {
        m_data = 0;
        m_size = 0;
        m_allocated_size = 0;
    }

    gim_array(GUINT reservesize)
    {
        m_data = 0;
        m_size = 0;

        m_allocated_size = 0;
        reserve(reservesize);
    }

    ~gim_array()
    {
        clear_memory();
    }

    inline GUINT size() const
    {
        return m_size;
    }

    inline GUINT max_size() const
    {
        return m_allocated_size;
    }

    inline T & operator[](size_t i)
	{
		return m_data[i];
	}
	inline  const T & operator[](size_t i) const
	{
		return m_data[i];
	}

    inline T * pointer(){ return m_data;}
    inline const T * pointer() const
    { return m_data;}


    inline T * get_pointer_at(GUINT i)
	{
		return m_data + i;
	}

	inline const T * get_pointer_at(GUINT i) const
	{
		return m_data + i;
	}

	inline T & at(GUINT i)
	{
		return m_data[i];
	}

	inline const T & at(GUINT i) const
	{
		return m_data[i];
	}

	inline T & front()
	{
		return *m_data;
	}

	inline const T & front() const
	{
		return *m_data;
	}

	inline T & back()
	{
		return m_data[m_size-1];
	}

	inline const T & back() const
	{
		return m_data[m_size-1];
	}


	inline void swap(GUINT i, GUINT j)
	{
	    gim_swap_elements(m_data,i,j);
	}

	inline void push_back(const T & obj)
	{
	    this->growingCheck();
	    m_data[m_size] = obj;
	    m_size++;
	}

	//!Simply increase the m_size, doesn't call the new element constructor
	inline void push_back_mem()
	{
	    this->growingCheck();
	    m_size++;
	}

	inline void push_back_memcpy(const T & obj)
	{
	    this->growingCheck();
	    irr_simd_memcpy(&m_data[m_size],&obj,sizeof(T));
	    m_size++;
	}

	inline void pop_back()
	{
	    m_size--;
        m_data[m_size].~T();
	}

	//!Simply decrease the m_size, doesn't call the deleted element destructor
	inline void pop_back_mem()
	{
	    m_size--;
	}

    //! fast erase
	inline void erase(GUINT index)
	{
	    if(index<m_size-1)
	    {
	        swap(index,m_size-1);
	    }
	    pop_back();
	}

	inline void erase_sorted_mem(GUINT index)
	{
	    m_size--;
	    for(GUINT i = index;i<m_size;i++)
	    {
	        gim_simd_memcpy(m_data+i,m_data+i+1,sizeof(T));
	    }
	}

	inline void erase_sorted(GUINT index)
	{
	    m_data[index].~T();
	    erase_sorted_mem(index);
	}

	inline void insert_mem(GUINT index)
	{
	    this->growingCheck();
	    for(GUINT i = m_size;i>index;i--)
	    {
	        gim_simd_memcpy(m_data+i,m_data+i-1,sizeof(T));
	    }
	    m_size++;
	}

	inline void insert(const T & obj,GUINT index)
	{
	    insert_mem(index);
	    m_data[index] = obj;
	}

	inline void resize(GUINT size, bool call_constructor = true, const T& fillData=T())
	{
	    if(size>m_size)
	    {
            reserve(size);
            if(call_constructor)
            {
                while(m_size<size)
                {
                    m_data[m_size] = fillData;
                    m_size++;
                }
            }
            else
            {
            	m_size = size;
            }
	    }
	    else if(size<m_size)
	    {
	        if(call_constructor) clear_range(size);
	        m_size = size;
	    }
	}

	inline void refit()
	{
	    resizeData(m_size);
	}

};


#endif // GIM_CONTAINERS_H_INCLUDED