guard against null ptr access
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66825 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@ -819,9 +819,19 @@ private:
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reference_type operator*() const \
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{ return *(pointer_type)m_node->GetDataPtr(); } \
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ptrop \
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itor& operator++() { m_node = m_node->GetNext(); return *this; }\
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itor& operator++() \
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{ \
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if (m_node) \
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m_node = m_node->GetNext(); \
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return *this; \
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} \
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const itor operator++(int) \
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{ itor tmp = *this; m_node = m_node->GetNext(); return tmp; }\
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{ \
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itor tmp = *this; \
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if (m_node) \
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m_node = m_node->GetNext(); \
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return tmp; \
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} \
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itor& operator--() \
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{ \
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m_node = m_node ? m_node->GetPrevious() : m_init; \
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@ -862,9 +872,19 @@ private:
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reference_type operator*() const \
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{ return *(pointer_type)m_node->GetDataPtr(); } \
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ptrop \
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itor& operator++() { m_node = m_node->GetNext(); return *this; }\
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itor& operator++() \
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{ \
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if (m_node) \
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m_node = m_node->GetNext(); \
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return *this; \
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} \
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const itor operator++(int) \
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{ itor tmp = *this; m_node = m_node->GetNext(); return tmp; }\
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{ \
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itor tmp = *this; \
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if (m_node) \
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m_node = m_node->GetNext(); \
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return tmp; \
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} \
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itor& operator--() \
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{ \
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m_node = m_node ? m_node->GetPrevious() : m_init; \
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