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以下语句实际上做了什么以及它的效果是什么?
#pragma pack(push,8)
它将当前pack设置推入堆栈(以便您稍后可以通过 恢复它pop),然后将结构元素的对齐设置为 8 个字节。任何不是自然对齐到 8 字节边界的东西都会在它之前插入填充字节以保持所需的对齐。
pack
pop