Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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h = (union alloc_header*)(((char*)h)+(16LL<<j));。关于这个话题，谷歌浏览器【最新下载地址】提供了深入分析
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