libMesh::ReferenceCountedObject< T > 模板类 参考

This class implements reference counting. 更多...

#include <reference_counted_object.h>

类 libMesh::ReferenceCountedObject< T > 继承关系图:

Public 成员函数
	~ReferenceCountedObject ()
	Destructor. 更多...

静态 Public 成员函数
static std::string	get_info ()
	Gets a string containing the reference information. 更多...
static void	print_info (std::ostream &out_stream=libMesh::out)
	Prints the reference information, by default to libMesh::out. 更多...
static unsigned int	n_objects ()
	Prints the number of outstanding (created, but not yet destroyed) objects. 更多...
static void	enable_print_counter_info ()
	Methods to enable/disable the reference counter output from print_info() 更多...
static void	disable_print_counter_info ()

Protected 类型
typedef std::map< std::string, std::pair< unsigned int, unsigned int > >	Counts
	Data structure to log the information. 更多...

Protected 成员函数
	ReferenceCountedObject ()
	Constructor. 更多...
	ReferenceCountedObject (const ReferenceCountedObject &other)
	Also, increment the counter if the copy-constructor is called. 更多...
	ReferenceCountedObject (ReferenceCountedObject &&other) noexcept
	Move constructor, must be declared noexcept. 更多...
ReferenceCountedObject &	operator= (const ReferenceCountedObject &)
	Copy assignment operator does nothing - we're copying an already-allocated object over an already-allocated object, so the counts for this class shouldn't change. 更多...
void	increment_constructor_count (const std::string &name) noexcept
	Increments the construction counter. 更多...
void	increment_destructor_count (const std::string &name) noexcept
	Increments the destruction counter. 更多...

静态 Protected 属性
static Counts	_counts
	Actually holds the data. 更多...
static Threads::atomic < unsigned int >	_n_objects
	The number of objects. 更多...
static Threads::spin_mutex	_mutex
	Mutual exclusion object to enable thread-safe reference counting. 更多...
static bool	_enable_print_counter = true
	Flag to control whether reference count information is printed when print_info is called. 更多...

详细描述

template<typename T>
class libMesh::ReferenceCountedObject< T >

This class implements reference counting.

Any class that is properly derived from this class will get reference counted, provided that the library is configured with –enable-reference-counting and you are compiling with DEBUG defined. For example, the following is sufficient to define the class Foo as a reference counted class:

class Foo : public ReferenceCountedObject<Foo>
{
 public:

   Foo  () {}

   ~Foo () {}

   void bar ();

 private:
};

If the library is configured with –disable-reference-counting or DEBUG is not defined then this class does nothing. All members are inlined and empty, so they should effectively disappear.

作者

Benjamin S. Kirk

日期

2002-2007

在文件 reference_counted_object.h 第 65 行定义.

成员类型定义说明

typedef std::map<std::string, std::pair<unsigned int, unsigned int> > libMesh::ReferenceCounter::Counts

protectedinherited

Data structure to log the information.

The log is identified by the class name.

在文件 reference_counter.h 第 119 行定义.

构造及析构函数说明

template<typename T>

libMesh::ReferenceCountedObject< T >::ReferenceCountedObject ( )

inlineprotected

Constructor.

Protected so that you cannot instantiate a ReferenceCountedObject, only derive from it.

在文件 reference_counted_object.h 第 74 行定义.

  {
#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)

    increment_constructor_count(typeid(T).name());

#endif
  }

template<typename T>

libMesh::ReferenceCountedObject< T >::ReferenceCountedObject ( const ReferenceCountedObject< T > &  other )

inlineprotected

Also, increment the counter if the copy-constructor is called.

在文件 reference_counted_object.h 第 86 行定义.

    : ReferenceCounter(other)
  {
#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)

    increment_constructor_count(typeid(T).name());

#endif
  }

template<typename T>

libMesh::ReferenceCountedObject< T >::ReferenceCountedObject ( ReferenceCountedObject< T > &&  other )

inlineprotectednoexcept

Move constructor, must be declared noexcept.

在文件 reference_counted_object.h 第 99 行定义.

    : ReferenceCounter(std::move(other))
  {
#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)

    increment_constructor_count(typeid(T).name());

#endif
  }

template<typename T>

libMesh::ReferenceCountedObject< T >::~ReferenceCountedObject ( )

inline

Destructor.

在文件 reference_counted_object.h 第 127 行定义.

  {
#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)

    increment_destructor_count(typeid(T).name());

#endif
  }

成员函数说明

void libMesh::ReferenceCounter::disable_print_counter_info ( )

staticinherited

在文件 reference_counter.C 第 100 行定义.

参考 libMesh::ReferenceCounter::_enable_print_counter.

{
  _enable_print_counter = false;
  return;
}

void libMesh::ReferenceCounter::enable_print_counter_info ( )

staticinherited

Methods to enable/disable the reference counter output from print_info()

在文件 reference_counter.C 第 94 行定义.

参考 libMesh::ReferenceCounter::_enable_print_counter.

{
  _enable_print_counter = true;
  return;
}

std::string libMesh::ReferenceCounter::get_info ( )

staticinherited

Gets a string containing the reference information.

在文件 reference_counter.C 第 47 行定义.

参考 libMesh::ReferenceCounter::_counts.

参考自 libMesh::ReferenceCounter::print_info().

{
#if defined(LIBMESH_ENABLE_REFERENCE_COUNTING) && defined(DEBUG)

  std::ostringstream oss;

  oss << '\n'
      << " ---------------------------------------------------------------------------- \n"
      << "| Reference count information                                                |\n"
      << " ---------------------------------------------------------------------------- \n";

  for (const auto & [name, cd] : _counts)
    oss << "| " << name << " reference count information:\n"
        << "|  Creations:    " << cd.first    << '\n'
        << "|  Destructions: " << cd.second << '\n';

  oss << " ---------------------------------------------------------------------------- \n";

  return oss.str();

#else

  return "";

#endif
}

void libMesh::ReferenceCounter::increment_constructor_count ( const std::string &  name )

inlineprotectednoexceptinherited

Increments the construction counter.

Should be called in the constructor of any derived class that will be reference counted.

在文件 reference_counter.h 第 183 行定义.

参考 libMesh::err.

参考自 libMesh::ReferenceCountedObject< SparseMatrix< T > >::ReferenceCountedObject().

{
  libmesh_try
  {
    Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
    std::pair<unsigned int, unsigned int> & p = _counts[name];
    p.first++;
  }
  libmesh_catch (...)
  {
    auto stream = libMesh::err.get();
    stream->exceptions(stream->goodbit); // stream must not throw
    libMesh::err << "Encountered unrecoverable error while calling "
                 << "ReferenceCounter::increment_constructor_count() "
                 << "for a(n) " << name << " object." << std::endl;
    std::terminate();
  }
}

void libMesh::ReferenceCounter::increment_destructor_count ( const std::string &  name )

inlineprotectednoexceptinherited

Increments the destruction counter.

Should be called in the destructor of any derived class that will be reference counted.

在文件 reference_counter.h 第 207 行定义.

参考 libMesh::err.

参考自 libMesh::ReferenceCountedObject< SparseMatrix< T > >::~ReferenceCountedObject().

{
  libmesh_try
  {
    Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
    std::pair<unsigned int, unsigned int> & p = _counts[name];
    p.second++;
  }
  libmesh_catch (...)
  {
    auto stream = libMesh::err.get();
    stream->exceptions(stream->goodbit); // stream must not throw
    libMesh::err << "Encountered unrecoverable error while calling "
                 << "ReferenceCounter::increment_destructor_count() "
                 << "for a(n) " << name << " object." << std::endl;
    std::terminate();
  }
}

static unsigned int libMesh::ReferenceCounter::n_objects ( )

inlinestaticinherited

Prints the number of outstanding (created, but not yet destroyed) objects.

在文件 reference_counter.h 第 85 行定义.

参考 libMesh::ReferenceCounter::_n_objects.

参考自 libMesh::LibMeshInit::~LibMeshInit().

  { return _n_objects; }

template<typename T>

ReferenceCountedObject& libMesh::ReferenceCountedObject< T >::operator= ( const ReferenceCountedObject< T > &  )

inlineprotected

Copy assignment operator does nothing - we're copying an already-allocated object over an already-allocated object, so the counts for this class shouldn't change.

There are also no non-static members in this or the base class to copy, so there is nothing for us to actually do.

在文件 reference_counted_object.h 第 116 行定义.

  {
    return *this;
  }

void libMesh::ReferenceCounter::print_info ( std::ostream &  out_stream = libMesh::out )

staticinherited

Prints the reference information, by default to libMesh::out.

在文件 reference_counter.C 第 81 行定义.

参考 libMesh::ReferenceCounter::_enable_print_counter , 以及 libMesh::ReferenceCounter::get_info().

参考自 libMesh::LibMeshInit::~LibMeshInit().

{
  if (_enable_print_counter)
    out_stream << ReferenceCounter::get_info();
}

类成员变量说明

ReferenceCounter::Counts libMesh::ReferenceCounter::_counts

staticprotectedinherited

Actually holds the data.

在文件 reference_counter.h 第 124 行定义.

参考自 libMesh::ReferenceCounter::get_info().

bool libMesh::ReferenceCounter::_enable_print_counter = true

staticprotectedinherited

Flag to control whether reference count information is printed when print_info is called.

在文件 reference_counter.h 第 143 行定义.

参考自 libMesh::ReferenceCounter::disable_print_counter_info(), libMesh::ReferenceCounter::enable_print_counter_info() , 以及 libMesh::ReferenceCounter::print_info().

Threads::spin_mutex libMesh::ReferenceCounter::_mutex

staticprotectedinherited

Mutual exclusion object to enable thread-safe reference counting.

在文件 reference_counter.h 第 137 行定义.

Threads::atomic< unsigned int > libMesh::ReferenceCounter::_n_objects

staticprotectedinherited

The number of objects.

Print the reference count information when the number returns to 0.

在文件 reference_counter.h 第 132 行定义.

参考自 libMesh::ReferenceCounter::n_objects(), libMesh::ReferenceCounter::ReferenceCounter() , 以及 libMesh::ReferenceCounter::~ReferenceCounter().

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