初始化的有关问题

初始化的问题classTDesC8{unsignedintiLength:28unsignedintiType:4__DECLARE_TEST}//请问unsignedint

初始化的问题
class   TDesC8
        {
unsigned   int   iLength:28;
unsigned   int   iType:4;

__DECLARE_TEST;
        };
//
请问unsigned   int   iLength:28;
使啥意思   ,对iLength初始化码

[解决办法]
位域。
[解决办法]
unsigned int iLength:28;
unsigned int iType:4;
iLength占28个bit,iType占4个bit
[解决办法]
位域