Function MOODYCAMEL_CONSTEXPR_IF

concurrentqueue.h:2179–2181

				}
				
				MOODYCAMEL_CONSTEXPR_IF (MOODYCAMEL_NOEXCEPT_CTOR(T, decltype(*itemFirst), new (static_cast<T*>(nullptr)) T(details::deref_noexcept(itemFirst)))) {
					blockIndex.load(std::memory_order_relaxed)->front.store((pr_blockIndexFront - 1) & (pr_blockIndexSize - 1), std::memory_order_release);
				}
			}
			
			// Enqueue, one block at a time