functor.cpp

// functor.cpp -- using a functor
#include <iostream>
#include <list>
#include <iterator>
#include <algorithm>

template<class T>
class TooBig{
private:
  T cutoff;
public:
  TooBig(const T & t):cutoff(t){}
  bool operator()(const T & v){return v>cutoff;}
};

void outint(int n){std::cout<<n<<" ";}

int main(){
  using std::list;
  using std::cout;
  using std::endl;

  TooBig<int> f100(100);
  int vals[10]={50, 100, 90, 180, 60, 210, 415, 88, 188, 201};
  list<int> yadayada(vals, vals+10);
  list<int> etcetera(vals, vals+10);

  cout<<"Original lists:\n";
  for_each(yadayada.begin(),yadayada.end(), outint);
  cout<<endl;
  for_each(etcetera.begin(),etcetera.end(),outint);
  cout<<endl;

  yadayada.remove_if(f100);
  etcetera.remove_if(TooBig<int>(200));

  cout<<"Trimmed lists:\n";
  for_each(yadayada.begin(),yadayada.end(),outint);
  cout<<endl;
  for_each(etcetera.begin(),etcetera.end(),outint);
  cout<<endl;

  return 0;
}