#pragma pack

#pragma pack是一个C/C++编译器指令，主要用于改变编译器的内存对齐方式。它可以被用来指定结构体、联合或类成员的字节对齐方式。基本用法是#pragma pack(n)，其中n可以取1、2、4、8或16，分别表示以1、2、4、8或16个字节对齐。如果不使用#pragma pack指令，则采用默认的字节对齐方式，通常是8字节对齐。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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