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C Language Memonry Management of Struct

C Language Memonry Management of Struct

# 结构体内存存储空间分配的原则

  • 编译器按照成员列表顺序一个接一个地给每个成员分配内存。只有当存储成员时需要满足正确的边界对齐要求时,成员之间才可能出现用于填充的额外内存空间。
  • 结构体变量的首地址要能够被其最宽基本类型元素的大小所整除。
  • 结构体的每个元素相对于结构体首地址的偏移量都是元素大小的整数倍,如有需要编译器会在元素之间加上填充字节。
  • 结构体的总大小为结构体最宽基本类型元素大小的整数倍,如有需要编译器会在最末一个元素之后加上填充字节。

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