Method ~ExplicitProducer

deps/concurrentqueue/concurrentqueue.h:1768–1831

		}
		
		~ExplicitProducer()
		{
			// Destruct any elements not yet dequeued.
			// Since we're in the destructor, we can assume all elements
			// are either completely dequeued or completely not (no halfways).
			if (this->tailBlock != nullptr) {		// Note this means there must be a block index too
				// First find the block that's partially dequeued, if any
				Block* halfDequeuedBlock = nullptr;
				if ((this->headIndex.load(std::memory_order_relaxed) & static_cast<index_t>(BLOCK_SIZE - 1)) != 0) {
					// The head's not on a block boundary, meaning a block somewhere is partially dequeued
					// (or the head block is the tail block and was fully dequeued, but the head/tail are still not on a boundary)
					size_t i = (pr_blockIndexFront - pr_blockIndexSlotsUsed) & (pr_blockIndexSize - 1);
					while (details::circular_less_than<index_t>(pr_blockIndexEntries[i].base + BLOCK_SIZE, this->headIndex.load(std::memory_order_relaxed))) {
						i = (i + 1) & (pr_blockIndexSize - 1);
					}
					assert(details::circular_less_than<index_t>(pr_blockIndexEntries[i].base, this->headIndex.load(std::memory_order_relaxed)));
					halfDequeuedBlock = pr_blockIndexEntries[i].block;
				}
				
				// Start at the head block (note the first line in the loop gives us the head from the tail on the first iteration)
				auto block = this->tailBlock;
				do {
					block = block->next;
					if (block->ConcurrentQueue::Block::template is_empty<explicit_context>()) {
						continue;
					}
					
					size_t i = 0;	// Offset into block
					if (block == halfDequeuedBlock) {
						i = static_cast<size_t>(this->headIndex.load(std::memory_order_relaxed) & static_cast<index_t>(BLOCK_SIZE - 1));
					}
					
					// Walk through all the items in the block; if this is the tail block, we need to stop when we reach the tail index
					auto lastValidIndex = (this->tailIndex.load(std::memory_order_relaxed) & static_cast<index_t>(BLOCK_SIZE - 1)) == 0 ? BLOCK_SIZE : static_cast<size_t>(this->tailIndex.load(std::memory_order_relaxed) & static_cast<index_t>(BLOCK_SIZE - 1));
					while (i != BLOCK_SIZE && (block != this->tailBlock || i != lastValidIndex)) {
						(*block)[i++]->~T();
					}
				} while (block != this->tailBlock);
			}
			
			// Destroy all blocks that we own
			if (this->tailBlock != nullptr) {
				auto block = this->tailBlock;
				do {
					auto nextBlock = block->next;
					if (block->dynamicallyAllocated) {
						destroy(block);
					}
					else {
						this->parent->add_block_to_free_list(block);
					}
					block = nextBlock;
				} while (block != this->tailBlock);
			}
			
			// Destroy the block indices
			auto header = static_cast<BlockIndexHeader*>(pr_blockIndexRaw);
			while (header != nullptr) {