C++14だとけっこうすっきりする

test.cpp

#include <utility>

#include <boost/fusion/include/transform.hpp>
#include <boost/fusion/include/make_vector.hpp>
#include <boost/fusion/include/invoke.hpp>

class S
{
private:
	int a;
	long b;

public:
    S(const int aa, const long bb)
    : a(aa), b(bb) {}

	int A() const
	{
		return a;
	}

	long B() const
	{
		return b;
	}

	template<typename FUNC, typename... ARGS>
	auto F(FUNC&& f, ARGS&&... args) const
	{
		auto a = boost::fusion::transform(boost::fusion::make_vector(std::forward<ARGS>(args)...),
		[this](auto f)
		{
			return (this->*f)();
		});

		return boost::fusion::invoke(f, a);
	}
};

int Foo(const S& s)
{
	return s.F([](int a)
	{
		return a*5;
	}, &S::A);
}

long Bar(const S& s)
{
	return s.F([](int a, long b)
	{
		return b + a;
	}, &S::A, &S::B);
}

int foo(const S& s)
{
	return s.A()*5;
}

long bar(const S& s)
{
	return s.B() + s.A();
}