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I'm unsure if it's me not understanding or the documentation isn't clearly formulated. The following excerpt has been taken from the newest draft (N3126, section 29.6): bool atomic_compare_exchange_weak(volatile A* object, C * expected, C desired); bool atomic_compare_exchange_weak(A* object, C * expected, C desired); bool atomic_compare_exchange_strong(volatile A* object, C * expected, C desired); bool atomic_compare_exchange_strong(A* object, C * expected, C desired); bool atomic_compare_exchange_weak_explicit(volatile A* object, C * expected, C desired, memory_order success, memory_order failure); bool atomic_compare_exchange_weak_explicit(A* object, C * expected, C desired, memory_order success, memory_order failure); bool atomic_compare_exchange_strong_explicit(volatile A* object, C * expected, C desired, memory_order success, memory_order failure); bool atomic_compare_exchange_strong_explicit(A* object, C * expected, C desired, memory_order success, memory_order failure); bool A::compare_exchange_weak(C & expected, C desired, memory_order success, memory_order failure) volatile; bool A::compare_exchange_weak(C & expected, C desired, memory_order success, memory_order failure); bool A::compare_exchange_strong(C & expected, C desired, memory_order success, memory_order failure) volatile; bool A::compare_exchange_strong(C & expected, C desired, memory_order success, memory_order failure); bool A::compare_exchange_weak(C & expected, C desired, memory_order order = memory_order_seq_cst) volatile; bool A::compare_exchange_weak(C & expected, C desired, memory_order order = memory_order_seq_cst); bool A::compare_exchange_strong(C & expected, C desired, memory_order order = memory_order_seq_cst) volatile; bool A::compare_exchange_strong(C & expected, C desired, memory_order order = memory_order_seq_cst); Remark: The weak compare-and-exchange operations may fail spuriously, tha

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