RE: [Boost-Users] boos::bind class member function

From: Ioffe, Robert (robert.ioffe_at_[hidden])
Date: 2003-08-12 11:17:49

Dirk,

The following should not compile:

for_each(v.begin(), v.end(), boost::bind(&myclass::print, _1));

since myclass::print actually takes two arguments and the first one is
not the std::string, but the object of class myclass.

So you should do something like this:

myclass foo;
for_each(v.begin(), v.end(), boost::bind(&myclass::print, foo, _1));

Have fun,
Robert Ioffe

-----Original Message-----
From: dirk_griffioen [mailto:diddekio_at_[hidden]] 
Sent: Tuesday, August 12, 2003 3:43 AM
To: Boost-Users_at_[hidden]
Subject: [Boost-Users] boos::bind class member function

Hi,

I would like to use a for_each with a class member function. 

The for_each in myclass::do_print below does not compile. And I 
simply cant figure it out.

I'm using vc7.1.

////////////////////////////////
void print2(std::string s) 
{
  cout << s << '\n';
}

class myclass
{
public:
  void print(std::string s);
  void do_print();
};

void myclass::print(std::string s) 
{
  cout << s << '\n';
}

void myclass::do_print()
{
  vector<std::string> v;
  v.push_back("a");
  v.push_back("b");
  v.push_back("c");
  v.push_back("d");
  
  for_each(v.begin(), v.end(), 
           boost::bind(boost::type<void>(), 
           &myclass::print, _1));
}
/////////////////////////////////////////

nor will

for_each(v.begin(), v.end(), boost::bind(&myclass::print, _1));
for_each(v.begin(), v.end(), boost::bind(print, _1));

whereas

for_each(v.begin(), v.end(), boost::bind(print2, _1));

is ok

It seems natural to do, but I cant get it.

Dirk

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