author | hgs |
Tue, 20 Jul 2010 16:35:53 +0530 | |
changeset 44 | 97b0fb8a2cc2 |
parent 18 | 47c74d1534e1 |
permissions | -rw-r--r-- |
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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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107 |
|
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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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117 |
|
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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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121 |
|
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--(*m_state.m_sharedNbAlloc); |
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123 |
|
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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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127 |
|
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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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133 |
|
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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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139 |
|
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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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152 |
|
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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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157 |
|
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bool operator != (StackAllocator const& other) const |
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{ return !(*this == other); } |
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160 |
|
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private: |
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State m_state; |
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}; |
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164 |
|
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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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168 |
|
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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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177 |
|
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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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# endif |
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194 |
|
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#if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES) |
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} |
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#endif |
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|
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#undef __STD |
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|
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#endif //STLPORT_UNIT_TEST_STACK_ALLOCATOR_H |