boost::bind模倣プログラム

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <functional>
#include <numeric>
//#include <boost/bind.hpp>

namespace
{
	class placeholder {};
	placeholder _1;
}

template <typename R,typename T, typename Arg>
class simple_bind_t
{
public:
	typedef R (T::*fn)(Arg);
	simple_bind_t(fn f,const T& t):fn_(f),t_(t)
	{}
	R operator()(Arg a)
	{
		return (t_.*fn_)(a);
	}
private:
	fn fn_;
	T t_;
};

template <typename R, typename T, typename Arg>
simple_bind_t<R,T,Arg> simple_bind(
								   R (T::*fn)(Arg),
								   const T& t,
								   const placeholder&)
{
	std::cout << typeid(R).name() << std::endl
		<< typeid(T).name() << std::endl
		<< typeid(Arg).name() << std::endl;
	return simple_bind_t<R,T,Arg>(fn,t);
}

class Test
{
public:
	void do_stuff(const std::vector<int>& v)
	{
		std::copy(v.begin(),v.end(),
			std::ostream_iterator<int>(std::cout," "));
	}
};
template <typename R,typename T,typename Arg>
int my_mem_fun(R (T::*f)(Arg))
{
	std::cout << typeid(R).name() << std::endl
		<< typeid(T).name() << std::endl
		<< typeid(Arg).name() << std::endl;
	return 1;
}
class Cla1
{
public:
	std::vector<int> fun1(float val)
	{
		return std::vector<int>();
	}
};

int main()
{
	Test t;
	std::vector<int> vec;
	vec.push_back(42);
	vec.push_back(55);
	vec.push_back(88);
	simple_bind(&Test::do_stuff,t,_1)(vec);

	my_mem_fun(&Cla1::fun1);
}