print_value.cpp

#include <iostream>
#include <algorithm>
#include <functional>
#include <type_traits>

using namespace std;

auto If = [](bool condition, auto tFunc, auto fFunc)
{
	function<void()> funcTable[2] = {fFunc,tFunc};
	funcTable[(int)condition]();
};

template<typename Func>
class Iterate : Func
{

public:
	Iterate(Func func) : Func(move(func)){}
protected:
	using Func::operator();
public:
	void operator()(int current, int end)
	{
		If(current+1 != end,
		[&](){
			operator()(current);
			operator()(current-1,end);
		},
		[](){});
	}
};

auto ForRange = [](int current, int end, auto func)
{
	using Func = decltype(func);
	Iterate<decay_t<Func>>it(forward<Func>(func));
	it.operator()(current,end);
};

void p(int a,int b)
{
	If(a<b,[&](){
		swap(a,b);
	},[](){}
	);

	ForRange(a,b,[](auto v){cout << v << endl;});
}

int main()
{
	p(5,1);
}