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使用以下联合typedef,访问MyPacket.Byte.LB与MyPacket.Field.LB相比,速度存在差异吗?联合/结构数据类型和位字段引用速度
typedef union // create a union to assemble bytes into ints
{
int Packet; // contains an int
struct
{
char HB;
char LB;
}Byte;
struct
{
unsigned field1:4;
unsigned field2:2;
unsigned field3:1;
unsigned field4:1;
unsigned LB:8;
}Field;
} packetunion;
packetunion MyPacket;
或检查编译的代码..他们应该是相同的 – 2012-02-20 20:40:55