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Difference between revisions of "cpp/atomic/atomic store"

From cppreference.com
< cpp‎ | atomic
m (+shared_ptr)
(Applied P2869R4 (Remove Deprecated shared_ptr Atomic Access APIs from C++26).)
 
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{{cpp/title|atomic_store|atomic_store_explicit}}
 
{{cpp/title|atomic_store|atomic_store_explicit}}
−
{{cpp/atomic/sidebar}}
+
{{cpp/thread/navbar}}
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{{ddcl list begin}}
+
{{dcl begin}}
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{{ddcl list header | atomic }}
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{{dcl header|atomic}}
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{{ddcl list item | num=1 | notes={{mark since c++11}} | 1=
+
{{dcl|num=1|since=c++11|
 
template< class T >
 
template< class T >
−
void atomic_store( std::atomic<T>* obj, T desr );
+
void atomic_store( std::atomic<T>* obj,
 +
                  typename std::atomic<T>::value_type desired ) noexcept;
 
}}
 
}}
−
{{ddcl list item | num=2 | notes={{mark since c++11}} | 1=
+
{{dcl|num=2|since=c++11|
 
template< class T >
 
template< class T >
−
void atomic_store( volatile std::atomic<T>* obj, T desr );
+
void atomic_store( volatile std::atomic<T>* obj,
 +
                  typename std::atomic<T>::value_type desired ) noexcept;
 
}}
 
}}
−
{{ddcl list item | num=3 | notes={{mark since c++11}} | 1=
+
{{dcl|num=3|since=c++11|
 
template< class T >
 
template< class T >
−
void atomic_store_explicit( std::atomic<T>* obj, T desr, std::memory_order order);
+
void atomic_store_explicit( std::atomic<T>* obj,
 +
                            typename std::atomic<T>::value_type desired,  
 +
                            std::memory_order order) noexcept;
 
}}
 
}}
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{{ddcl list item | num=4 | notes={{mark since c++11}} | 1=
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{{dcl|num=4|since=c++11|
 
template< class T >
 
template< class T >
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void atomic_store_explicit( volatile std::atomic<T>* obj, T desr, std::memory_order order);
+
void atomic_store_explicit( volatile std::atomic<T>* obj,
 +
                            typename std::atomic<T>::value_type desired,  
 +
                            std::memory_order order) noexcept;
 
}}
 
}}
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{{ddcl list end}}
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{{dcl end}}
  
−
1-2) Atomically replaces the value pointed to by {{tt|obj}} with the value of {{tt|desr}} as if by {{cpp|obj->store(desr)}}
+
@1,2@ Atomically replaces the value pointed to by {{c|obj}} with the value of {{c|desired}} as if by {{c|obj->store(desired)}}.
  
−
3-4) Atomically replaces the value pointed to by {{tt|obj}} with the value of {{tt|desr}} as if by {{cpp|obj->store(desr, order)}}
+
@3,4@ Atomically replaces the value pointed to by {{c|obj}} with the value of {{c|desired}} as if by {{c|obj->store(desired, order)}}.
 +
@@ If {{c|order}} is one of {{c|std::memory_order_consume}}, {{c|std::memory_order_acquire}} and {{c|std::memory_order_acq_rel}}, the behavior is undefined.
  
 
===Parameters===
 
===Parameters===
 +
{{par begin}}
 +
{{par|obj|pointer to the atomic object to modify}}
 +
{{par|desired|the value to store in the atomic object}}
 +
{{par|order|the memory synchronization ordering}}
 +
{{par end}}
  
−
{{param list begin}}
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===Return value===
−
{{param list item | obj | pointer to the atomic object to modify}}
+
(none)
−
{{param list item | desr | the value to store in the atomic object}}
+
−
{{param list item | order | the memory sycnhronization ordering for this operation}}
+
−
{{param list end}}
+
  
−
===Exceptions===
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===Defect reports===
−
{{noexcept}}
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{{dr list begin}}
 +
{{dr list item|std=C++11|paper=P0558R1|before=exact type match was required because<br>{{tt|T}} was deduced from multiple arguments|after={{tt|T}} is only deduced<br>from {{c|obj}}}}
 +
{{dr list end}}
  
 
===See also===
 
===See also===
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{{dcl list begin}}
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{{dsc begin}}
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{{dcl list template | cpp/atomic/atomic/dcl list store | mem=std::atomic<T>}}
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{{dsc inc|cpp/atomic/atomic/dsc store|mem=std::atomic<T>}}
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{{dcl list template | cpp/atomic/dcl list atomic_load}}
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{{dsc inc|cpp/atomic/dsc atomic_load}}
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{{dcl list template | cpp/atomic/dcl list memory_order}}
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{{dsc inc|cpp/atomic/dsc memory_order}}
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{{dcl list ptfun | cpp/memory/shared_ptr/atomic_access | title=std::atomic_store{{dcl small|(std::shared_ptr)}}
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{{dsc break}}
−
<br>std::atomic_store_explicit{{dcl small|(std::shared_ptr)}} | specializes atomic operations for std::shared_ptr }}
+
{{dsc tfun|cpp/memory/shared_ptr/atomic|notes={{mark life|deprecated=c++20|removed=c++26|br=yes}}|title=std::atomic_store{{dsc small|(std::shared_ptr)}}
−
{{dcl list end}}
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<br>std::atomic_store_explicit{{dsc small|(std::shared_ptr)}}|specializes atomic operations for {{lc|std::shared_ptr}}}}
 +
{{dsc see c|c/atomic/atomic_store|atomic_store|atomic_store_explicit}}
 +
{{dsc end}}
 +
 
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 04:49, 24 April 2024

 
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Defined in header <atomic>
template< class T >

void atomic_store( std::atomic<T>* obj,

                   typename std::atomic<T>::value_type desired ) noexcept;
 (1) (since C++11)
template< class T >

void atomic_store( volatile std::atomic<T>* obj,

                   typename std::atomic<T>::value_type desired ) noexcept;
 (2) (since C++11)
template< class T >

void atomic_store_explicit( std::atomic<T>* obj,
                            typename std::atomic<T>::value_type desired,

                            std::memory_order order) noexcept;
 (3) (since C++11)
template< class T >

void atomic_store_explicit( volatile std::atomic<T>* obj,
                            typename std::atomic<T>::value_type desired,

                            std::memory_order order) noexcept;
 (4) (since C++11)
1,2) Atomically replaces the value pointed to by obj with the value of desired as if by obj->store(desired).
3,4) Atomically replaces the value pointed to by obj with the value of desired as if by obj->store(desired, order).
If order is one of std::memory_order_consume, std::memory_order_acquire and std::memory_order_acq_rel, the behavior is undefined.

Contents

[edit] Parameters

obj - pointer to the atomic object to modify
desired - the value to store in the atomic object
order - the memory synchronization ordering

[edit] Return value

(none)

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
P0558R1 C++11 exact type match was required because
T was deduced from multiple arguments 		T is only deduced
from obj

[edit] See also

 atomically replaces the value of the atomic object with a non-atomic argument
(public member function of std::atomic<T>) [edit]
(C++11)(C++11)
 atomically obtains the value stored in an atomic object
(function template) [edit]
(C++11)
 defines memory ordering constraints for the given atomic operation
(enum) [edit]
(deprecated in C++20)(removed in C++26)
 specializes atomic operations for std::shared_ptr
(function template)
C documentation for atomic_store, atomic_store_explicit
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