c++ - Segmentation fault when declaring a vector -

i'm writing programme 2 classes:

 class sequence {      protected:     vector<int> seq_;      public:     sequence(){             for(int i=0; i<16;i++)                     seq_.push_back(0);     };     sequence(int a, int b,int c){             for(int i=0; i<16; i++)                     seq_.push_back(a*i+b*i*i+c*i*i*i);     };     sequence(const sequence & myseq){             for(int i=0; i<16;i++)                     seq_[i]=myseq.get_i(i);     };      int get_i(int i)const{             return seq_[i];     };      void print() const {              for(int i=0; i<16; i++)                     cout<<seq_[i]<<endl;     };      int operator*(sequence & myseq) const {             int sum=0;             for(int i=0; i<16;i++)                     sum+=seq_[i]*myseq.seq_[i];             return sum;     };      void operator=(sequence & myseq) {             for(int i=0; i<16; i++)                     seq_[i]=myseq.seq_[i];     };  }; 

this first class devoted containing sequence , overloading basics operators. following, on other side, contains binary sequence corresponding number (or random binary sequence if default constructor gets call).

 class binary : public sequence {      private:      public:     binary(){             for(int i=0; i<16; i++)                     seq_.push_back(round(drand48()));     };      binary(int num){             double prec=num; double last=0;             for(int i=16; i>=0; i--){                             prec=prec-last;                             if(int(prec/pow(2,i))==0){                                     seq_.push_back(0);                                     last=0;                             }else{                                     seq_.push_back(1);                                     last=pow(2,i);                             }             }     };      binary  not_ () {             binary mybin;             for(int i=0; i<16; i++){                     if( seq_[i]==1){                             mybin.seq_[i]=0;                     }else{                               mybin.seq_[i]=1;                     };             };             return mybin;     };      int cost (sequence myseq){             int k=myseq*(*this)-(binary::not_())*myseq;             return k;     };      }; 

the problem segmentation fault defining vector:

 vector<binary> mybins (pow(2,16)); 

i ran gdb , stuck @ copy constructor:

 sequence(const sequence & ) 

i wondering if give me find error , explain me. i'm guessing has poor knowledge of how standard library works! thank time.

sequence(const sequence & myseq){ 

this constructor. constructing new object.

        for(int i=0; i<16;i++)                 seq_[i]=myseq.get_i(i); 

the seq_ member empty vector. attempting set nonexistent values in vector undefined behavior, , reason crash. other constructors use push_back(), correctly, insert new values vector. should done here well.