How to fill a vector with non-trivial initial values?

Question

I know how to fill an std::vector with non-trivial initial values, e.g. sequence numbers:

void IndexArray( unsigned int length, std::vector&a         


        

Answer 1

You can use the generate algorithm, for a more general way of filling up containers:

#include 
#include 
#include 

struct c_unique {
   int current;
   c_unique() {current=0;}
   int operator()() {return ++current;}
} UniqueNumber;


int main () {
  vector myvector (8);
  generate (myvector.begin(), myvector.end(), UniqueNumber);

  cout << "\nmyvector contains:";
  for (vector::iterator it=myvector.begin(); it!=myvector.end(); ++it)
    cout << " " << *it;

  cout << endl;

  return 0;
}

This was shamelessly lifted and edited from cplusplusreference.