intrusive_stack.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2016 John Wellbelove
 
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#ifndef ETL_INTRUSIVE_STACK_INCLUDED
#define ETL_INTRUSIVE_STACK_INCLUDED
 
#include "platform.h"
#include "error_handler.h"
#include "intrusive_links.h"
#include "type_traits.h"
 
#include <stddef.h>
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class intrusive_stack_exception : public etl::exception
  {
  public:
 
    intrusive_stack_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class intrusive_stack_empty : public intrusive_stack_exception
  {
  public:
 
    intrusive_stack_empty(string_type file_name_, numeric_type line_number_)
      : intrusive_stack_exception(ETL_ERROR_TEXT("intrusive_stack:empty", ETL_INTRUSIVE_STACK_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class intrusive_stack_value_is_already_linked : public intrusive_stack_exception
  {
  public:
 
    intrusive_stack_value_is_already_linked(string_type file_name_, numeric_type line_number_)
      : intrusive_stack_exception(ETL_ERROR_TEXT("intrusive_stack:value is already linked", ETL_INTRUSIVE_STACK_FILE_ID"B"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TLink>
  class intrusive_stack_base
  {
  public:
 
    // Node typedef.
    typedef TLink link_type;
 
    //*************************************************************************
    //*************************************************************************
    void push(link_type& value)
    {
      ETL_ASSERT_OR_RETURN(!value.is_linked(), ETL_ERROR(intrusive_stack_value_is_already_linked));
 
      value.etl_next = p_top;
      p_top          = &value;
 
      ++current_size;
    }
 
    //*************************************************************************
    //*************************************************************************
    void pop()
    {
      ETL_ASSERT_CHECK_PUSH_POP_OR_RETURN(!empty(), ETL_ERROR(intrusive_stack_empty));
 
      link_type* p_next = p_top->etl_next;
      p_top->clear();
      p_top = p_next;
      --current_size;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TContainer>
    void pop_into(TContainer& destination)
    {
      link_type* p_link = p_top;
      pop();
      destination.push(*p_link);
    }
 
    //*************************************************************************
    //*************************************************************************
    void reverse()
    {
      link_type* previous = &terminator;
      link_type* current  = p_top;
      link_type* next;
 
      while (current != &terminator)
      {
        next              = current->etl_next;
        current->etl_next = previous;
        previous          = current;
        current           = next;
      }
 
      p_top = previous;
    }
 
    //*************************************************************************
    //*************************************************************************
    void clear()
    {
      while (!empty())
      {
        pop();
      }
 
      current_size = 0;
    }
 
    //*************************************************************************
    //*************************************************************************
    bool empty() const
    {
      return current_size == 0;
    }
 
    //*************************************************************************
    //*************************************************************************
    size_t size() const
    {
      return current_size;
    }
 
  protected:
 
    //*************************************************************************
    //*************************************************************************
    intrusive_stack_base()
      : p_top(&terminator)
      , current_size(0)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ~intrusive_stack_base() {}
 
    link_type* p_top;      
    link_type  terminator; 
 
    size_t current_size; 
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename TValue, typename TLink>
  class intrusive_stack : public etl::intrusive_stack_base<TLink>
  {
  public:
 
    // Node typedef.
    typedef typename etl::intrusive_stack_base<TLink>::link_type link_type;
 
    // STL style typedefs.
    typedef TValue            value_type;
    typedef value_type*       pointer;
    typedef const value_type* const_pointer;
    typedef value_type&       reference;
    typedef const value_type& const_reference;
    typedef size_t            size_type;
 
    //*************************************************************************
    //*************************************************************************
    intrusive_stack()
      : intrusive_stack_base<TLink>()
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    reference top()
    {
      ETL_ASSERT_CHECK_EXTRA(!this->empty(), ETL_ERROR(intrusive_stack_empty));
      return *static_cast<TValue*>(this->p_top);
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference top() const
    {
      ETL_ASSERT_CHECK_EXTRA(!this->empty(), ETL_ERROR(intrusive_stack_empty));
      return *static_cast<const TValue*>(this->p_top);
    }
 
  private:
 
    // Disable copy construction and assignment.
    intrusive_stack(const intrusive_stack&);
    intrusive_stack& operator=(const intrusive_stack& rhs);
  };
} // namespace etl
 
#endif