整理

include/boost/container/detail/guards_dended.hpp

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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Benedek Thaler 2015-2016
+// (C) Copyright Ion Gaztanaga 2019-2020. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://erenon.hu/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_CONTAINER_DETAIL_GUARDS_HPP
+#define BOOST_CONTAINER_DETAIL_GUARDS_HPP
+
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+
+#include <boost/move/core.hpp> // BOOST_MOVABLE_BUT_NOT_COPYABLE
+
+// move/detail
+#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
+#include <boost/move/detail/fwd_macros.hpp>
+#endif
+
+#include <boost/container/allocator_traits.hpp>
+
+namespace boost {
+namespace container {
+namespace detail {
+
+class null_construction_guard
+{
+public:
+
+   #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_CONTAINER_DOXYGEN_INVOKED)
+
+   template <typename... Args>
+   null_construction_guard(Args&&...) {}
+
+   #else
+
+   #define NULL_CONSTRUCTION_GUARD_CODE(N) \
+   BOOST_MOVE_TMPL_LT##N BOOST_MOVE_CLASS##N BOOST_MOVE_GT##N \
+   BOOST_CONTAINER_FORCEINLINE null_construction_guard(BOOST_MOVE_UREFANON##N)\
+   {}\
+   //
+   BOOST_MOVE_ITERATE_0TO9(NULL_CONSTRUCTION_GUARD_CODE)
+   #undef NULL_CONSTRUCTION_GUARD_CODE
+   #endif
+
+   void release() {}
+   void extend() {}
+};
+
+template <typename Allocator>
+class construction_guard
+{
+  typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
+  typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
+
+  BOOST_MOVABLE_BUT_NOT_COPYABLE(construction_guard)
+
+public:
+   construction_guard()
+      : _alloc_ptr()
+      , _elem_count()
+      , _allocator()
+   {}
+
+  construction_guard(pointer alloc_ptr, Allocator& allocator)
+      :_alloc_ptr(alloc_ptr)
+      , _elem_count(0)
+      , _allocator(&allocator)
+  {}
+
+  construction_guard(BOOST_RV_REF(construction_guard) rhs)
+      :_alloc_ptr(rhs._alloc_ptr)
+      , _elem_count(rhs._elem_count)
+      , _allocator(rhs._allocator)
+  {
+    rhs._elem_count = 0;
+  }
+
+  ~construction_guard()
+  {
+    while (_elem_count) {
+      --_elem_count;
+      boost::container::allocator_traits<Allocator>::destroy(*_allocator, _alloc_ptr++);
+    }
+  }
+
+  void release()
+  {
+    _elem_count = 0;
+  }
+
+  void extend()
+  {
+    ++_elem_count;
+  }
+
+private:
+  pointer _alloc_ptr;
+  size_type _elem_count;
+  Allocator* _allocator;
+};
+
+
+/**
+ * Has two ranges
+ *
+ * On success, destroys the first range (src),
+ * on failure, destroys the second range (dst).
+ *
+ * Can be used when copying/moving a range
+ */
+template <class Allocator>
+class nand_construction_guard
+{
+   typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
+   typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
+
+   construction_guard<Allocator> _src;
+   construction_guard<Allocator> _dst;
+   bool _dst_released;
+
+   public:
+   nand_construction_guard()
+      : _src()
+      , _dst()
+      , _dst_released(false)
+   {}
+
+   nand_construction_guard( pointer src, Allocator& src_alloc
+                          , pointer dst, Allocator& dst_alloc)
+    :_src(src, src_alloc),
+     _dst(dst, dst_alloc),
+     _dst_released(false)
+   {}
+
+   void extend()
+   {
+      _src.extend();
+      _dst.extend();
+   }
+
+   void release() // on success
+   {
+      _dst.release();
+      _dst_released = true;
+   }
+
+   ~nand_construction_guard()
+   {
+      if (! _dst_released) { _src.release(); }
+   }
+};
+
+
+template <typename Allocator>
+class allocation_guard
+{
+  typedef typename boost::container::allocator_traits<Allocator>::pointer pointer;
+  typedef typename boost::container::allocator_traits<Allocator>::size_type size_type;
+
+  BOOST_MOVABLE_BUT_NOT_COPYABLE(allocation_guard)
+
+public:
+  allocation_guard(pointer alloc_ptr, size_type alloc_size, Allocator& allocator)
+    :_alloc_ptr(alloc_ptr),
+     _alloc_size(alloc_size),
+     _allocator(allocator)
+  {}
+
+  ~allocation_guard()
+  {
+    if (_alloc_ptr)
+    {
+      boost::container::allocator_traits<Allocator>::deallocate(_allocator, _alloc_ptr, _alloc_size);
+    }
+  }
+
+  void release()
+  {
+    _alloc_ptr = 0;
+  }
+
+private:
+  pointer _alloc_ptr;
+  size_type _alloc_size;
+  Allocator& _allocator;
+};
+
+}}} // namespace boost::container::detail
+
+#include <boost/container/detail/config_end.hpp>
+
+#endif // BOOST_CONTAINER_DETAIL_GUARDS_HPP