ceph/src/boost/libs/circular_buffer/include/boost/circular_buffer/debug.hpp

   1 // Debug support for the circular buffer library.
   2
   3 // Copyright (c) 2003-2008 Jan Gaspar
   4
   5 // Use, modification, and distribution is subject to the Boost Software
   6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #if !defined(BOOST_CIRCULAR_BUFFER_DEBUG_HPP)
  10 #define BOOST_CIRCULAR_BUFFER_DEBUG_HPP
  11
  12 #if defined(_MSC_VER)
  13     #pragma once
  14 #endif
  15
  16 #if BOOST_CB_ENABLE_DEBUG
  17 #include <cstring>
  18
  19 #if defined(BOOST_NO_STDC_NAMESPACE)
  20 namespace std {
  21     using ::memset;
  22 }
  23 #endif
  24
  25 #endif // BOOST_CB_ENABLE_DEBUG
  26 namespace boost {
  27
  28 namespace cb_details {
  29
  30 #if BOOST_CB_ENABLE_DEBUG
  31
  32 // The value the uninitialized memory is filled with.
  33 const int UNINITIALIZED = 0xcc;
  34
  35 template <class T>
  36 inline void do_fill_uninitialized_memory(T* data, std::size_t size_in_bytes) BOOST_NOEXCEPT {
  37     std::memset(static_cast<void*>(data), UNINITIALIZED, size_in_bytes);
  38 }
  39
  40 template <class T>
  41 inline void do_fill_uninitialized_memory(T& /*data*/, std::size_t /*size_in_bytes*/) BOOST_NOEXCEPT {
  42     // Do nothing
  43 }
  44
  45
  46 class debug_iterator_registry;
  47
  48 /*!
  49     \class debug_iterator_base
  50     \brief Registers/unregisters iterators into the registry of valid iterators.
  51
  52     This class is intended to be a base class of an iterator.
  53 */
  54 class debug_iterator_base {
  55
  56 private:
  57 // Members
  58
  59     //! Iterator registry.
  60     mutable const debug_iterator_registry* m_registry;
  61
  62     //! Next iterator in the iterator chain.
  63     mutable const debug_iterator_base* m_next;
  64
  65 public:
  66 // Construction/destruction
  67
  68     //! Default constructor.
  69     debug_iterator_base();
  70
  71     //! Constructor taking the iterator registry as a parameter.
  72     debug_iterator_base(const debug_iterator_registry* registry);
  73
  74     //! Copy constructor.
  75     debug_iterator_base(const debug_iterator_base& rhs);
  76
  77     //! Destructor.
  78     ~debug_iterator_base();
  79
  80 // Methods
  81
  82     //! Assign operator.
  83     debug_iterator_base& operator = (const debug_iterator_base& rhs);
  84
  85     //! Is the iterator valid?
  86     bool is_valid(const debug_iterator_registry* registry) const;
  87
  88     //! Invalidate the iterator.
  89     /*!
  90         \note The method is const in order to invalidate const iterators, too.
  91     */
  92     void invalidate() const;
  93
  94     //! Return the next iterator in the iterator chain.
  95     const debug_iterator_base* next() const;
  96
  97     //! Set the next iterator in the iterator chain.
  98     /*!
  99         \note The method is const in order to set a next iterator to a const iterator, too.
 100     */
 101     void set_next(const debug_iterator_base* it) const;
 102
 103 private:
 104 // Helpers
 105
 106     //! Register self as a valid iterator.
 107     void register_self();
 108
 109     //! Unregister self from valid iterators.
 110     void unregister_self();
 111 };
 112
 113 /*!
 114     \class debug_iterator_registry
 115     \brief Registry of valid iterators.
 116
 117     This class is intended to be a base class of a container.
 118 */
 119 class debug_iterator_registry {
 120
 121     //! Pointer to the chain of valid iterators.
 122     mutable const debug_iterator_base* m_iterators;
 123
 124 public:
 125 // Methods
 126
 127     //! Default constructor.
 128     debug_iterator_registry() : m_iterators(0) {}
 129
 130     //! Register an iterator into the list of valid iterators.
 131     /*!
 132         \note The method is const in order to register iterators into const containers, too.
 133     */
 134     void register_iterator(const debug_iterator_base* it) const {
 135         it->set_next(m_iterators);
 136         m_iterators = it;
 137     }
 138
 139     //! Unregister an iterator from the list of valid iterators.
 140     /*!
 141         \note The method is const in order to unregister iterators from const containers, too.
 142     */
 143     void unregister_iterator(const debug_iterator_base* it) const {
 144         const debug_iterator_base* previous = 0;
 145         for (const debug_iterator_base* p = m_iterators; p != it; previous = p, p = p->next()) {}
 146         remove(it, previous);
 147     }
 148
 149     //! Invalidate every iterator pointing to the same element as the iterator passed as a parameter.
 150     template <class Iterator>
 151     void invalidate_iterators(const Iterator& it) {
 152         const debug_iterator_base* previous = 0;
 153         for (const debug_iterator_base* p = m_iterators; p != 0; p = p->next()) {
 154             if (((Iterator*)p)->m_it == it.m_it) {
 155                 p->invalidate();
 156                 remove(p, previous);
 157                 continue;
 158             }
 159             previous = p;
 160         }
 161     }
 162
 163     //! Invalidate all iterators except an iterator poining to the same element as the iterator passed as a parameter.
 164     template <class Iterator>
 165     void invalidate_iterators_except(const Iterator& it) {
 166         const debug_iterator_base* previous = 0;
 167         for (const debug_iterator_base* p = m_iterators; p != 0; p = p->next()) {
 168             if (((Iterator*)p)->m_it != it.m_it) {
 169                 p->invalidate();
 170                 remove(p, previous);
 171                 continue;
 172             }
 173             previous = p;
 174         }
 175     }
 176
 177     //! Invalidate all iterators.
 178     void invalidate_all_iterators() {
 179         for (const debug_iterator_base* p = m_iterators; p != 0; p = p->next())
 180             p->invalidate();
 181         m_iterators = 0;
 182     }
 183
 184 private:
 185 // Helpers
 186
 187     //! Remove the current iterator from the iterator chain.
 188     void remove(const debug_iterator_base* current,
 189                 const debug_iterator_base* previous) const {
 190         if (previous == 0)
 191             m_iterators = m_iterators->next();
 192         else
 193             previous->set_next(current->next());
 194     }
 195 };
 196
 197 // Implementation of the debug_iterator_base methods.
 198
 199 inline debug_iterator_base::debug_iterator_base() : m_registry(0), m_next(0) {}
 200
 201 inline debug_iterator_base::debug_iterator_base(const debug_iterator_registry* registry)
 202 : m_registry(registry), m_next(0) {
 203     register_self();
 204 }
 205
 206 inline debug_iterator_base::debug_iterator_base(const debug_iterator_base& rhs)
 207 : m_registry(rhs.m_registry), m_next(0) {
 208     register_self();
 209 }
 210
 211 inline debug_iterator_base::~debug_iterator_base() { unregister_self(); }
 212
 213 inline debug_iterator_base& debug_iterator_base::operator = (const debug_iterator_base& rhs) {
 214     if (m_registry == rhs.m_registry)
 215         return *this;
 216     unregister_self();
 217     m_registry = rhs.m_registry;
 218     register_self();
 219     return *this;
 220 }
 221
 222 inline bool debug_iterator_base::is_valid(const debug_iterator_registry* registry) const {
 223     return m_registry == registry;
 224 }
 225
 226 inline void debug_iterator_base::invalidate() const { m_registry = 0; }
 227
 228 inline const debug_iterator_base* debug_iterator_base::next() const { return m_next; }
 229
 230 inline void debug_iterator_base::set_next(const debug_iterator_base* it) const { m_next = it; }
 231
 232 inline void debug_iterator_base::register_self() {
 233     if (m_registry != 0)
 234         m_registry->register_iterator(this);
 235 }
 236
 237 inline void debug_iterator_base::unregister_self() {
 238     if (m_registry != 0)
 239         m_registry->unregister_iterator(this);
 240 }
 241
 242 #endif // #if BOOST_CB_ENABLE_DEBUG
 243
 244 } // namespace cb_details
 245
 246 } // namespace boost
 247
 248 #endif // #if !defined(BOOST_CIRCULAR_BUFFER_DEBUG_HPP)