[boost] boost::ref simple question

From: Neal D. Becker (ndbecker2_at_[hidden])
Date: 2004-11-08 10:15:47

This must be a common question.

I want to use std::transform with a function object that is expensive to
copy, so I want to pass by reference.  I tried to use boost::ref for this,
but this simple test doesn't work:

struct Op {
  int operator() (int x) { return 1 + x;}
  Op() {}
private:
  Op (const Op&);
  
};

int main() {
  vector<int> x (4);
  vector<int> y (4);
  Op o;
  std::transform (x.begin(), x.end(), y.begin(), boost::ref(o));
}

Any suggestion?