std:: atomic_fetch_max, std:: atomic_fetch_max_explicit

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atomic_fetch_max atomic_fetch_max_explicit
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Defined in header <atomic>
template < class T >

T atomic_fetch_max ( std:: atomic < T > * obj,

typename std:: atomic < T > :: value_type arg ) noexcept ;
(1) (since C++26)
template < class T >

T atomic_fetch_max ( volatile std:: atomic < T > * obj,

typename std:: atomic < T > :: value_type arg ) noexcept ;
(2) (since C++26)
template < class T >

T atomic_fetch_max_explicit ( std:: atomic < T > * obj,
typename std:: atomic < T > :: value_type arg,

std:: memory_order order ) noexcept ;
(3) (since C++26)
template < class T >

T atomic_fetch_max_explicit ( volatile std:: atomic < T > * obj,
typename std:: atomic < T > :: value_type arg,

std:: memory_order order ) noexcept ;
(4) (since C++26)

Atomically replaces the value pointed by obj with the result of std::max between the old value of obj and arg . Returns the value obj held previously. The operation is performed as if the following was executed:

1,2) obj - > fetch_max ( arg )
3,4) obj - > fetch_max ( arg, order )

If std::atomic<T> has no fetch_max member (this member is only provided for integral and pointer types except bool ), the program is ill-formed.

Parameters

obj - pointer to the atomic object to modify
arg - the value to std::max with the value stored in the atomic object
order - the memory synchronization ordering

Return value

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

Notes

Feature-test macro Value Std Feature
__cpp_lib_atomic_min_max 202403L (C++26) Atomic minimum/maximum

Example

This section is incomplete
Reason: no example

See also

(C++26)
atomically performs std::max between the argument and the value of the atomic object and obtains the value held previously
(public member function of std::atomic<T> )
(C++26) (C++26)
replaces the atomic object with the result of std::min with a non-atomic argument and obtains the previous value of the atomic
(function template)
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