std::atomic_load, std::atomic_load_explicit

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

Atomic operations library

Types

atomic (C++11)

atomic_ref (C++20)

Functions

atomic_storeatomic_store_explicit (C++11)(C++11)

atomic_loadatomic_load_explicit (C++11)(C++11)

atomic_exchangeatomic_exchange_explicit (C++11)(C++11)

atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit (C++11)(C++11)(C++11)(C++11)

atomic_fetch_addatomic_fetch_add_explicit (C++11)(C++11)

atomic_fetch_subatomic_fetch_sub_explicit (C++11)(C++11)

atomic_fetch_andatomic_fetch_and_explicit (C++11)(C++11)

atomic_fetch_oratomic_fetch_or_explicit (C++11)(C++11)

atomic_fetch_xoratomic_fetch_xor_explicit (C++11)(C++11)

atomic_is_lock_free (C++11)

Atomic flags

atomic_flag (C++11)

atomic_flag_test_and_setatomic_flag_test_and_set_explicit (C++11)(C++11)

atomic_flag_clearatomic_flag_clear_explicit (C++11)(C++11)

Initialization

atomic_init (C++11)

ATOMIC_VAR_INIT (C++11)

ATOMIC_FLAG_INIT (C++11)

Memory ordering

memory_order (C++11)

kill_dependency (C++11)

atomic_thread_fence (C++11)

atomic_signal_fence (C++11)

Defined in header <atomic>
	(1)	(since C++11)
template< class T > T atomic_load( const std::atomic<T>* obj ) noexcept;
template< class T > T atomic_load( const volatile std::atomic<T>* obj ) noexcept;
			(2)	(since C++11)
template< class T > T atomic_load_explicit( const std::atomic<T>* obj, std::memory_order order ) noexcept;
template< class T > T atomic_load_explicit( const volatile std::atomic<T>* obj, std::memory_order order ) noexcept;

1) Atomically obtains the value pointed to by obj as if by obj->load()

2) Atomically obtains the value pointed to by obj as if by obj->load(order)

Parameters

obj	-	pointer to the atomic object to modify
order	-	the memory synchronization ordering for this operation: only std::memory_order_relaxed, std::memory_order_consume, std::memory_order_acquire and std::memory_order_seq_cst are permitted.

Return value

The value that is held by the atomic object pointed to by obj

See also

load	atomically obtains the value of the atomic object (public member function of std::atomic)
atomic_storeatomic_store_explicit (C++11)(C++11)	atomically replaces the value of the atomic object with a non-atomic argument (function template)
memory_order (C++11)	defines memory ordering constraints for the given atomic operation (enum)
std::atomic_load(std::shared_ptr) std::atomic_load_explicit(std::shared_ptr)	specializes atomic operations for std::shared_ptr (function template)