Atomic_xor_of_things< T_thing, T_digit > Class Template Reference

A class to allow any trivially copyable object to be XOR'ed. More...

#include <os0thread.h>

Public Member Functions
	Atomic_xor_of_things ()
void	xor_thing (T_thing id)
T_thing	recover_if_single ()
	Returns an object that was XOR'ed odd number of times. More...

Private Attributes
std::array< std::atomic< T_digit >, digits_count >	acc

Static Private Attributes
static constexpr size_t	digits_count

Detailed Description

template<typename T_thing, typename T_digit>
class Atomic_xor_of_things< T_thing, T_digit >

A class to allow any trivially copyable object to be XOR'ed.

Trivially copyable according to https://en.cppreference.com/w/cpp/named_req/TriviallyCopyable means we can copy the underlying representation to array of chars, and back and consider it a valid copy. It is thread-safe when changing, but no modifications must be assured during reading the stored value.

Constructor & Destructor Documentation

Atomic_xor_of_things()

template<typename T_thing , typename T_digit >

Atomic_xor_of_things< T_thing, T_digit >::Atomic_xor_of_things ( )

inline

Member Function Documentation

recover_if_single()

template<typename T_thing , typename T_digit >

T_thing Atomic_xor_of_things< T_thing, T_digit >::recover_if_single ( )

inline

Returns an object that was XOR'ed odd number of times.

This function assumes there is exactly one such object, and caller must assure this. This method is not thread-safe and caller must ensure no other thread is trying to modify the value.

xor_thing()

template<typename T_thing , typename T_digit >

void Atomic_xor_of_things< T_thing, T_digit >::xor_thing ( T_thing  id )

inline

Member Data Documentation

acc

template<typename T_thing , typename T_digit >

std::array<std::atomic<T_digit>, digits_count> Atomic_xor_of_things< T_thing, T_digit >::acc

private

digits_count

template<typename T_thing , typename T_digit >

constexpr size_t Atomic_xor_of_things< T_thing, T_digit >::digits_count

staticconstexprprivate

Initial value:

=
      ut::div_ceil(sizeof(T_thing), sizeof(T_digit))

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

• storage/innobase/include/os0thread.h