genericopenlibs/cppstdlib/stl/test/unit/stack_allocator.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 16:46:38 +0300
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permissions -rw-r--r--
Revision: 201011 Kit: 201015
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#ifndef STLPORT_UNIT_TEST_STACK_ALLOCATOR_H
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#define STLPORT_UNIT_TEST_STACK_ALLOCATOR_H
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#include <algorithm>
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#if !defined (STLPORT) || defined (_STLP_USE_EXCEPTIONS)
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//For bad_alloc:
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#  include <new>
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#endif
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#if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)
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#  define __STD std::
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#else
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#  define __STD
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#endif
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struct State {
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  char *m_beg, *m_end, *m_cur;
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  bool m_isOk, m_swaped;
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  int m_nbAlloc;
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  //The following members are shared among all StackAllocator instance created from
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  //a reference StackAllocator instance:
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  char **m_sharedCur;
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  bool *m_sharedOk;
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  int *m_sharedNbAlloc;
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#if defined (__DMC__)
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  State(){}
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#endif
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  State(char *beg, char *end)
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    : m_beg(beg), m_end(end), m_cur(m_beg), m_isOk(true), m_swaped(false), m_nbAlloc(0),
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      m_sharedCur(&m_cur), m_sharedOk(&m_isOk), m_sharedNbAlloc(&m_nbAlloc) {}
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  State(const State& other)
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  : m_beg(other.m_beg), m_end(other.m_end), m_cur(0),
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    m_isOk(true), m_swaped(other.m_swaped), m_nbAlloc(0),
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    m_sharedCur(other.m_sharedCur), m_sharedOk(other.m_sharedOk),
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    m_sharedNbAlloc(other.m_sharedNbAlloc) {}
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};
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/* This allocator is not thread safe:
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 */
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template <class _Tp>
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struct StackAllocator
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#if (defined (__BORLANDC__) || defined (__DMC__)) && \
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    defined (STLPORT) && !defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
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  //Special Borland workaround that have problem with function
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  //overloading when one of the overloaded version is a template
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  //one. This is the case for the std::swap function.
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  : public __STD __stlport_class<StackAllocator<_Tp> >
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#endif
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{
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  typedef _Tp        value_type;
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  typedef value_type *       pointer;
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  typedef const _Tp* const_pointer;
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  typedef _Tp&       reference;
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  typedef const _Tp& const_reference;
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  typedef size_t     size_type;
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  typedef ptrdiff_t  difference_type;
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#if defined (__DMC__)
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  StackAllocator(){}
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#endif
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  StackAllocator(char *beg, char *end)
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    : m_state(beg, end) {}
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  const State& getState() const { return m_state; }
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#if !defined (STLPORT) || defined (_STLP_MEMBER_TEMPLATES)
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  template <class _OtherTp>
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  StackAllocator(StackAllocator<_OtherTp> const& other)
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    : m_state(other.getState()) {}
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#else
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  StackAllocator(const State& state)
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    : m_state(state) {}
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#endif
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#if !defined (STLPORT) || defined (_STLP_MEMBER_TEMPLATE_CLASSES)
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  template <class _Other>
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  struct rebind {
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    typedef StackAllocator<_Other> other;
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  };
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#endif
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  _Tp* allocate(size_type n, void* = 0) {
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    if (n == 0)
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      return 0;
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    ++(*m_state.m_sharedNbAlloc);
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    if (*m_state.m_sharedCur + (n * sizeof(_Tp)) < m_state.m_end) {
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      char *ret = *m_state.m_sharedCur;
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      *m_state.m_sharedCur += n * sizeof(_Tp);
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      return reinterpret_cast<_Tp*>(ret);
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    }
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#if !defined (STLPORT) || defined (_STLP_USE_EXCEPTIONS)
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    throw __STD bad_alloc();
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#  if defined (__DMC__)
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    return 0;
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#  endif
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#else
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    return 0;
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#endif
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  }
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#if (defined (__BORLANDC__) || defined (__DMC__)) && \
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    defined (STLPORT) && !defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
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  //Necessary extension to make StackAllocator a real STLport allocator
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  //implementation:
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  _Tp* allocate(size_type n, size_type &new_n) {
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    new_n = n;
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    return allocate(n);
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  }
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#endif
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  void deallocate(pointer p, size_type n) {
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    if (p == 0)
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      return;
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    --(*m_state.m_sharedNbAlloc);
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   139
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    if ((char*)p == (*m_state.m_sharedCur - n * sizeof(_Tp))) {
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      *m_state.m_sharedCur -= n * sizeof(_Tp);
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    }
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   143
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    if ((char*)p < m_state.m_beg || (char*)p >= m_state.m_end) {
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      //An object has been returned to the bad allocator instance:
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      *m_state.m_sharedOk = false;
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    }
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  }
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  pointer address(reference __x) const {return &__x;}
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  const_pointer address(const_reference __x) const { return &__x; }
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  size_type max_size() const { return m_state.m_end - *m_state.m_sharedCur; }
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  void construct(pointer __p, const_reference __val) { new(__p) _Tp(__val);  }
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  void destroy(pointer __p) { __p->~_Tp(); }
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   155
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  bool ok() const { return m_state.m_isOk && (m_state.m_nbAlloc == 0); }
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  void reset () {
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    m_state.m_cur = m_state.m_beg;
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    m_state.m_isOk = true;
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    m_state.m_swaped = false;
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  }
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  bool swaped() const { return m_state.m_swaped; }
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  void swap(StackAllocator &other) {
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    __STD swap(m_state, other.m_state);
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    m_state.m_swaped = true;
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    other.m_state.m_swaped = true;
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  }
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   168
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  //2 StackAllocator instance are identical if they are built on top
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  //of the same buffer.
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  bool operator == (StackAllocator const& other) const
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  { return m_state.m_beg == other.m_state.m_beg; }
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   173
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  bool operator != (StackAllocator const& other) const
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  { return !(*this == other); }
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private:
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  State m_state;
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};
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#if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)
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namespace std {
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#endif
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#  if defined (STLPORT) && (defined (_STLP_DONT_SUPPORT_REBIND_MEMBER_TEMPLATE) || !defined (_STLP_MEMBER_TEMPLATES))
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template <class _Tp1, class _Tp2>
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inline StackAllocator<_Tp2>&
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__stl_alloc_rebind(StackAllocator<_Tp1>& __a, const _Tp2*) {  return (StackAllocator<_Tp2>&)(__a); }
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template <class _Tp1, class _Tp2>
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inline StackAllocator<_Tp2>
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__stl_alloc_create(const StackAllocator<_Tp1>& __a, const _Tp2*) { return StackAllocator<_Tp2>(__a.getState()); }
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#  endif
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#  if !defined (STLPORT) || defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
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  template <class _Tp>
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  inline void swap(StackAllocator<_Tp>& __a, StackAllocator<_Tp>& __b)
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  { __a.swap(__b); }
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#  else
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//TheFollowing overloads depends on instanciation, if new unit tests are written
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//with new StackAllocator instanciations associated swap overload should also be
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//written
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inline void swap(StackAllocator<int>& __a, StackAllocator<int>& __b)
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{ __a.swap(__b); }
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inline void swap(StackAllocator<char>& __a, StackAllocator<char>& __b)
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{ __a.swap(__b); }
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inline void swap(StackAllocator<pair<const int, int> >& __a,
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                 StackAllocator<pair<const int, int> >& __b)
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{ __a.swap(__b); }
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   209
#  endif
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   210
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#if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)
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}
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#endif
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#undef __STD
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#endif //STLPORT_UNIT_TEST_STACK_ALLOCATOR_H