std::atomic_fetch_xor

Defined in header `<atomic>`
	(1)	(since C++11)
template< class Integral > Integral atomic_fetch_xor( std::atomic<Integral>* obj, Integral arg );
template< class Integral > Integral atomic_fetch_xor( volatile std::atomic<Integral>* obj, Integral arg );
			(2)	(since C++11)
template< class Integral > Integral atomic_fetch_xor_explicit( std::atomic<Integral>* obj, Integral arg, std::memory_order order );
template< class Integral > Integral atomic_fetch_xor_explicit( volatile std::atomic<Integral>* obj, Integral arg, std::memory_order order );

Atomically replaces the value pointed by arg with the result of bitwise XOR between the old value of obj and arg. Returns the value obj held previously.

The operation is performed as if the following is executed:

1) obj->fetch_xor(arg)

2) obj->fetch_xor(arg, order)

Parameters

obj	-	pointer to the atomic object to modify
arg	-	the value to bitwise XOR to the value stored in the atomic object
order	-	the memory sycnhronization ordering for this operation: all values are permitted.

Return value

The value immediately preceding the effects of this function in the modification order of *obj.

Exceptions

noexcept specification:

noexcept

Possible implementation

template< class T >
typename std::enable_if<std::is_integral<T>::value && !std::is_same<T, bool>::value, T>::type
atomic_fetch_xor( std::atomic<T>* obj, T arg );
{
    return obj->fetch_xor(arg);
}

Example

fetch_xor (C++11)	atomically performs bitwise XOR between the argument and the value of the atomic object and obtains the value held previously (public member function of `std::atomic`)
atomic_fetch_oratomic_fetch_or_explicit (C++11)(C++11)	replaces the atomic object with the result of logical OR with a non-atomic argument and obtains the previous value of the atomic (function template)
atomic_fetch_andatomic_fetch_and_explicit (C++11)(C++11)	replaces the atomic object with the result of logical AND with a non-atomic argument and obtains the previous value of the atomic (function template)
C documentation for `atomic_fetch_xor, atomic_fetch_xor_explicit`

Links:

http://en.cppreference.com/w/cpp/atomic/atomic_fetch_xor

doc_CPP

2016-10-11 10:00:28

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