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#include <boost/thread/thread.hpp>
#include <string>
#include <iostream>
using namespace std;

class Child
{
string c;
public:
Child(string x):c(x){ }
void operator()(){
cout << c << " sub thread called." << endl;
}
};

class Parent
{
string p;
public:
Parent(string x):p(x){}
void operator()(){
cout << p << "thread called." << endl;
Child c1("I am child 1");
boost::thread c1t(c1);
}
};

int main(){
Parent p1("I am parent 1: ");
boost::thread p1t(p1);
}