Sometimes you need lambda::bind()

Note to self, next time you mix smart pointers and lambda, remember what to do if things don't resolve automatically. Ex.


#include <iostream>
#include <vector>
#include <boost/shared_ptr.hpp>
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>

using namespace std;
using namespace boost;
using namespace lambda;

struct B {
  explicit B(int a) : a_(a) {}
  int get_a() const { return a_; }
private:
  int a_;
};

ostream& operator << (ostream &s, const B &b)
{
  s << b.get_a();
  return s;
}

int main()
{
  shared_ptr<B> b1(new B(10));
  shared_ptr<B> b2(new B(5));
  vector<shared_ptr<B> > v;
  v.push_back(b1);
  v.push_back(b2);
  for_each(v.begin(),v.end(), cout << *_1 << ' '); 
  cout << endl;
  cout << count_if( v.begin(), v.end(), bind(&B::get_a, *_1) > 7);
  return(0);
}

Tags: programming

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Sometimes you need lambda::bind()

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