pmem::detail::self_relative_ptr_base_impl< OffsetType > Class Template Reference

self_relative_ptr base template class More...

#include <libpmemobj++/detail/self_relative_ptr_base_impl.hpp>

Inheritance diagram for pmem::detail::self_relative_ptr_base_impl< OffsetType >:

Public Member Functions
constexpr	self_relative_ptr_base_impl () noexcept
	Default constructor, equal the nullptr.
constexpr	self_relative_ptr_base_impl (std::nullptr_t) noexcept
	Nullptr constructor.
	self_relative_ptr_base_impl (void *ptr) noexcept
	Volatile pointer constructor. More...
	self_relative_ptr_base_impl (self_relative_ptr_base_impl const &r) noexcept
	Copy constructor. More...
self_relative_ptr_base_impl &	operator= (self_relative_ptr_base_impl const &r)
	Assignment operator. More...
self_relative_ptr_base_impl &	operator= (std::nullptr_t &&)
	Nullptr move assignment operator. More...
void	swap (self_relative_ptr_base_impl &other)
	Swaps two self_relative_ptr_base objects of the same type. More...
byte_ptr_type	to_byte_pointer () const noexcept
	Conversion to byte pointer.
void *	to_void_pointer () const noexcept
	Conversion to void*.
	operator void * () const noexcept
	Explicit conversion operator to void*.
	operator byte_ptr_type () const noexcept
	Explicit conversion operator to byte pointer.
bool	is_null () const noexcept
	Fast null checking without conversion to void*.

Static Public Member Functions
static difference_type	distance_between (const self_relative_ptr_base_impl &first, const self_relative_ptr_base_impl &second)
	Byte distance between two relative pointers.

Protected Member Functions
	self_relative_ptr_base_impl (difference_type offset) noexcept
	Offset constructor. More...
void *	offset_to_pointer (difference_type other_offset) const noexcept
	Conversion to void* use other offset.
difference_type	pointer_to_offset (const self_relative_ptr_base_impl &ptr) const noexcept
	Conversion self_relative_ptr_base to offset from itself.
difference_type	pointer_to_offset (void *ptr) const noexcept
	Conversion pointer to offset.

Detailed Description

template<typename OffsetType>
class pmem::detail::self_relative_ptr_base_impl< OffsetType >

self_relative_ptr base template class

Implements some of the functionality of the self_relative_ptr class. It defines all applicable conversions from and to a self_relative_ptr_base.

It can be used e.g. as a parameter, where self_relative_ptr of any template type is required. It is similar to self_relative_ptr<void> (it can point to whatever type), but it can be used when you want to have pointer to some unspecified self_relative_ptr (with self_relative_ptr<void> it can't be done, because: self_relative_ptr<T>* does not convert to self_relative_ptr<void>*).

The current version uses an approach where we store offset=real_offset-1 and zero offset (or real_offset equal one) is a null pointer. This is needed to support zero initialization.

• real_offset = pointer - this;
• pointer = real_offset + this;
• or pointer = offset + this + 1;

Constructor & Destructor Documentation

self_relative_ptr_base_impl() [1/3]

template<typename OffsetType >

pmem::detail::self_relative_ptr_base_impl< OffsetType >::self_relative_ptr_base_impl ( void *  ptr )

inlinenoexcept

Volatile pointer constructor.

Parameters

ptr	volatile pointer, pointing to persistent memory.

self_relative_ptr_base_impl() [2/3]

template<typename OffsetType >

pmem::detail::self_relative_ptr_base_impl< OffsetType >::self_relative_ptr_base_impl ( self_relative_ptr_base_impl< OffsetType > const &  r )

inlinenoexcept

Copy constructor.

Parameters

r	pointer to the same type.

self_relative_ptr_base_impl() [3/3]

template<typename OffsetType >

pmem::detail::self_relative_ptr_base_impl< OffsetType >::self_relative_ptr_base_impl ( difference_type  offset )

inlineprotectednoexcept

Offset constructor.

Parameters

offset

offset from self.

Member Function Documentation

operator=() [1/2]

template<typename OffsetType >

self_relative_ptr_base_impl& pmem::detail::self_relative_ptr_base_impl< OffsetType >::operator= ( self_relative_ptr_base_impl< OffsetType > const &  r )

inline

Assignment operator.

Self-relative pointer assignment within a transaction automatically registers this operation so that a rollback is possible.

Exceptions

pmem::transaction_error

when adding the object to the transaction failed.

operator=() [2/2]

template<typename OffsetType >

self_relative_ptr_base_impl& pmem::detail::self_relative_ptr_base_impl< OffsetType >::operator= ( std::nullptr_t &&  )

inline

Nullptr move assignment operator.

Exceptions

pmem::transaction_error

when adding the object to the transaction failed.

swap()

template<typename OffsetType >

void pmem::detail::self_relative_ptr_base_impl< OffsetType >::swap ( self_relative_ptr_base_impl< OffsetType > &  other )

inline

Swaps two self_relative_ptr_base objects of the same type.

Parameters

[in,out]

other

the other self_relative_ptr to swap.

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The documentation for this class was generated from the following file:

• libpmemobj++/detail/self_relative_ptr_base_impl.hpp