给函数赋值？这是肿不回事？

C/C++ code

void LowpanUdpAgent::sendmsg(int nbytes, AppData* data, const char* flags){    Packet *p;    int n;    assert (size_ > 0);    n = nbytes / size_;    if (nbytes == -1) {        printf("Error:  sendmsg() for Lowpan UDP should not be -1\n");        return;    }        // If they are sending data, then it must fit within a single packet.    if (data && nbytes > size_) {        printf("Error: data greater than maximum lowpan UDP packet size\n");        return;    }    double local_time = Scheduler::instance().clock();    while (n-- > 0) {        p = allocpkt();        hdr_cmn::access(p)->size() = size_;        hdr_rtp* rh = hdr_rtp::access(p);        rh->flags() = 0;        rh->seqno() = ++seqno_;        hdr_cmn::access(p)->timestamp() =             (u_int32_t)(SAMPLERATE*local_time);        // add "beginning of talkspurt" labels (tcl/ex/test-rcvr.tcl)        if (flags && (0 ==strcmp(flags, "NEW_BURST")))            rh->flags() |= RTP_M;        p->setdata(data);        target_->recv(p);    }    n = nbytes % size_;    if (n > 0) {        p = allocpkt();        hdr_cmn::access(p)->size() = n;     //这里        hdr_rtp* rh = hdr_rtp::access(p);        rh->flags() = 0; //这里        rh->seqno() = ++seqno_;        hdr_cmn::access(p)->timestamp() =             (u_int32_t)(SAMPLERATE*local_time);        // add "beginning of talkspurt" labels (tcl/ex/test-rcvr.tcl)        if (flags && (0 == strcmp(flags, "NEW_BURST")))            rh->flags() |= RTP_M;        p->setdata(data);        target_->recv(p);    }    idle();}

hdr_cmn::access(p)->size() = n; //这里
hdr_rtp* rh = hdr_rtp::access(p);
rh->flags() = 0; //这里

怎么能给函数赋值？

[解决办法]
是给函数的返回值赋值。
[解决办法]
如果返回的是个变量的引用，是完全可以这样做的！

只要函数的调用返回值是个左值就能够赋值的

[解决办法]
*strrchr( szPath, '\\' ) = '\0';

相信很多人都这么干过吧