我尝试在ns2-35中的文件myevalvid_sink.cc中添加一些代码，而我尝试制作此错误时出现此错误，有关代码中语法错误的任何想法。 谢谢
myvideo/myevalvid_sink.h:48: error: ISO C++ forbids declaration of ‘playbackbuffer’ with no type
myvideo/myevalvid_sink.h:48: error: expected ‘;’ before ‘*’ token
myvideo/myevalvid_sink.h: In constructor ‘myEvalvid_Sink::myEvalvid_Sink()’:
myvideo/myevalvid_sink.h:24: error: ‘plb’ was not declared in this scope
myvideo/myevalvid_sink.cc: In constructor ‘playbackbuffer::playbackbuffer(Packet*, int, double, myEvalvid_Sink*)’:
make: *** [myvideo/myevalvid_sink.o] Error 1
我遇到以下错误：
containerView?.setNeedsLayout()