Question

#include <stdio.h>

struct X
{
    short s; 
    int i; 
    char c;
};

struct Y
{
    int i;
    char c;
    short s;
};

struct Z
{
    int   i;
    short s;
    char  c;
};

int main() {
    printf("%lu %lu %lu
", sizeof(struct X), sizeof(struct Y), sizeof(struct Z));
    return 0;
}

The above 回返

12 8 8

demonstrating that a structure s alignment depends on the order its members are declared. Are there any compiler settings to optimally reorder these declarations (for minimum struct size)? What are some general rules of practice that ensure optimal alignment as projects scale?

Answer 1

是否有任何汇编机构对这些申报进行最佳的重新排序(最低结构规模)?

第C号允许方案依赖和敏感地制定成员令。竞争者不能自由重组结构成员。

确保最佳协调的一些一般业务规则

一般来说,你可以通过降低协调要求来命令成员,从而尽量减少结构布局中的dding。

许多汇编者还提供延期服务,使你能够减少或消除因与成员接触不当而导致业绩下降的可能代价。然而,这些延期在编汇人之间并不可行,在平台上,由于出入失常,造成硬差错,而不仅仅是业绩惩罚。

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