generic_pool.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2014 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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******************************************************************************/
 
#ifndef ETL_GENERIC_POOL_INCLUDED
#define ETL_GENERIC_POOL_INCLUDED
 
#include "platform.h"
#include "ipool.h"
#include "type_traits.h"
#include "static_assert.h"
#include "alignment.h"
 
#define ETL_POOL_CPP03_CODE 0
 
//*****************************************************************************
//*****************************************************************************
 
namespace etl
{
  //*************************************************************************
  //*************************************************************************
  template <size_t VTypeSize, size_t VAlignment, size_t VSize>
  class generic_pool : public etl::ipool
  {
  public:
 
    static ETL_CONSTANT size_t SIZE      = VSize;
    static ETL_CONSTANT size_t ALIGNMENT = VAlignment;
    static ETL_CONSTANT size_t TYPE_SIZE = VTypeSize;
 
    //*************************************************************************
    //*************************************************************************
    generic_pool()
      : etl::ipool(reinterpret_cast<char*>(&buffer[0]), Element_Size, VSize)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    U* allocate()
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::allocate<U>();
    }
 
#if ETL_CPP11_NOT_SUPPORTED || ETL_POOL_CPP03_CODE || ETL_USING_STLPORT
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    U* create()
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>();
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1>
    U* create(const T1& value1)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2>
    U* create(const T1& value1, const T2& value2)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2, typename T3>
    U* create(const T1& value1, const T2& value2, const T3& value3)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2, value3);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2, typename T3, typename T4>
    U* create(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2, value3, value4);
    }
#else
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename... Args>
    U* create(Args&&... args)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(etl::forward<Args>(args)...);
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    void destroy(const U* const p_object)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      ipool::destroy(p_object);
    }
 
  private:
 
    // The pool element.
    union Element
    {
      char* next;              
      char      value[VTypeSize]; 
      typename  etl::type_with_alignment<VAlignment>::type dummy; 
    };

    typename etl::aligned_storage<sizeof(Element), etl::alignment_of<Element>::value>::type buffer[VSize];
 
    static ETL_CONSTANT uint32_t Element_Size = sizeof(Element);
 
    // Should not be copied.
    generic_pool(const generic_pool&) ETL_DELETE;
    generic_pool& operator =(const generic_pool&) ETL_DELETE;
  };
 
  template <size_t VTypeSize, size_t VAlignment, size_t VSize>
  ETL_CONSTANT size_t generic_pool<VTypeSize, VAlignment, VSize>::SIZE;
  
  template <size_t VTypeSize, size_t VAlignment, size_t VSize>
  ETL_CONSTANT size_t generic_pool<VTypeSize, VAlignment, VSize>::ALIGNMENT;
  
  template <size_t VTypeSize, size_t VAlignment, size_t VSize>
  ETL_CONSTANT size_t generic_pool<VTypeSize, VAlignment, VSize>::TYPE_SIZE;
 
  //*************************************************************************
  //*************************************************************************
  template <size_t VTypeSize, size_t VAlignment>
  class generic_pool_ext : public etl::ipool 
  {
  private:
    // The pool element.
    union element_internal 
    {
      char* next;                                                 
      char value[VTypeSize];                                      
      typename etl::type_with_alignment<VAlignment>::type dummy;  
    };
 
    static const size_t ELEMENT_INTERNAL_SIZE = sizeof(element_internal);
 
  public:
    static ETL_CONSTANT size_t ALIGNMENT = VAlignment;
    static ETL_CONSTANT size_t TYPE_SIZE = VTypeSize;
 
    typedef typename etl::aligned_storage<sizeof(element_internal), etl::alignment_of<element_internal>::value>::type element;
 
    //*************************************************************************
    //*************************************************************************
    generic_pool_ext(element* buffer, size_t size) 
      : etl::ipool(reinterpret_cast<char*>(&buffer[0]), ELEMENT_INTERNAL_SIZE, size) 
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    U* allocate()
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::allocate<U>();
    }
 
#if ETL_CPP11_NOT_SUPPORTED || ETL_POOL_CPP03_CODE || ETL_USING_STLPORT
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    U* create()
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>();
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1>
    U* create(const T1& value1)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2>
    U* create(const T1& value1, const T2& value2)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2, typename T3>
    U* create(const T1& value1, const T2& value2, const T3& value3)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2, value3);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename T1, typename T2, typename T3, typename T4>
    U* create(const T1& value1, const T2& value2, const T3& value3, const T4& value4)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(value1, value2, value3, value4);
    }
#else
    //*************************************************************************
    //*************************************************************************
    template <typename U, typename... Args>
    U* create(Args&&... args)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      return ipool::create<U>(etl::forward<Args>(args)...);
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    template <typename U>
    void destroy(const U* const p_object)
    {
      ETL_STATIC_ASSERT(etl::alignment_of<U>::value <= VAlignment, "Type has incompatible alignment");
      ETL_STATIC_ASSERT(sizeof(U) <= VTypeSize, "Type too large for pool");
      ipool::destroy(p_object);
    }
 
  private:
    // Should not be copied.
    generic_pool_ext(const generic_pool_ext&) ETL_DELETE;
    generic_pool_ext& operator=(const generic_pool_ext&) ETL_DELETE;
  };
 
  template <size_t VTypeSize, size_t VAlignment>
  ETL_CONSTANT size_t generic_pool_ext<VTypeSize, VAlignment>::ALIGNMENT;
 
  template <size_t VTypeSize, size_t VAlignment>
  ETL_CONSTANT size_t generic_pool_ext<VTypeSize, VAlignment>::TYPE_SIZE;
}
 
#endif