# std::atomic_store, std::atomic_store_explicit

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< cpp‎ | atomic

Defined in header `<atomic>` |  |
| (1) | (since C++11)
template< class T > void atomic_store( std::atomic <T>* obj, typename std::atomic <T>::value_type desr ) noexcept; |  |
template< class T > void atomic_store( volatile std::atomic <T>* obj, typename std::atomic <T>::value_type desr ) noexcept; |  |
| (2) | (since C++11)
template< class T > void atomic_store_explicit( std::atomic <T>* obj, typename std::atomic <T>::value_type desr, std::memory_order order) noexcept; |  |
template< class T > void atomic_store_explicit( volatile std::atomic <T>* obj, typename std::atomic <T>::value_type desr, std::memory_order order) noexcept; |  |

1) Atomically replaces the value pointed to by `obj` with the value of `desr` as if by obj->store(desr)
2) Atomically replaces the value pointed to by `obj` with the value of `desr` as if by obj->store(desr, order)

### Parameters

obj | - | pointer to the atomic object to modify
desr | - | the value to store in the atomic object
order | - | the memory synchronization ordering for this operation: only std::memory_order_relaxed, std::memory_order_release and std::memory_order_seq_cst are permitted.

### Return value

none.

### 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 required because `T` is deduced from multiple arguments | `T` is deduced from the `atomic` argument only

### See also

store | atomically replaces the value of the atomic object with a non-atomic argument (public member function of `std::atomic<T>`)
atomic_loadatomic_load_explicit (C++11)(C++11) | atomically obtains the value stored in an atomic object (function template)
memory_order (C++11) | defines memory ordering constraints for the given atomic operation (enum)
std::atomic_store(std::shared_ptr) std::atomic_store_explicit(std::shared_ptr) | specializes atomic operations for std::shared_ptr (function template)

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