c++ - gzip read file succeed first time but fails the second time I call it -


i using boost gzip read zipped file. program runs fine when call first time. when call same function second time. fails. don't know why worked once. thanks!

void readcheckfile(const char* _checkname,queue<graphnode> &_q) {      int _dep;     int _val;     graphnode currentnode;     cout<<"hererererererer\n";     fstream _checkfile(_checkname, fstream::in | fstream::binary);     cout<<"tthererererererer\n";     std::stringstream _data;     boost::iostreams::filtering_streambuf<boost::iostreams::input> in;     in.push(boost::iostreams::gzip_decompressor());     in.push(_checkfile);     boost::iostreams::copy(in, _data);      cout<<"aaaatthererererererer\n";     //fstream _checkfile;     //_checkfile.open(_checkname,fstream::in);     _data>>_dep;     while(_data.good())     {         currentnode.depth=(unsigned char)_dep;         _data>>_val;         currentnode.x=(unsigned char)_val;         for(i=0;i<16;i++)         {             _data>>_val;             currentnode.state[i]=(unsigned char)_val;         }         _q.push(currentnode);     }     _checkfile.close();     //exit(0); }

when call twice terminal returns:

hererererererer tthererererererer aaaatthererererererer  hererererererer tthererererererer libc++abi.dylib: terminate called throwing exception  ===================================================================================== =   bad termination of 1 of application processes =   exit code: 6 =   cleaning remaining processes =   can ignore below cleanup messages =====================================================================================


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