编辑“︁C++ 与 C 联合体”︁（章节）

== 实际应用场景 ==
=== 硬件寄存器访问 ===
嵌入式系统中常用联合体访问硬件寄存器：
<syntaxhighlight lang="cpp">
union GPIO_Register {
    uint32_t raw;
    struct {
        uint32_t mode : 2;
        uint32_t pull : 2;
        uint32_t reserved : 28;
    } bits;
};
</syntaxhighlight>

=== 协议解析 ===
网络协议中解析多格式数据：
<syntaxhighlight lang="cpp">
union Packet {
    uint8_t bytes[4];
    struct {
        uint16_t header;
        uint8_t command;
        uint8_t checksum;
    } fields;
};
</syntaxhighlight>