nokeyworld.cpp

#include <functional>
#include <iostream>

using namespace std;

template<typename TFunc, typename FFunc>void If(bool condition, TFunc tFunc,
FFunc fFunc)
{
	std::function<void()> jumpTable[2] = {fFunc,tFunc};
	jumpTable[static_cast<int>(condition)]();
};

template<typename TFunc>void If(bool condition, TFunc tFunc)
{
	If(condition, tFunc, [](){});
};

template<typename ConditionFunc, typename Func>
void While(ConditionFunc conditionFunc, Func func)
{
	auto compFunc = [&]() -> bool {return conditionFunc();};
	If(compFunc(),
	[&](){
		func();
		While(conditionFunc, func);
	});
}

template<typename InitFunc, typename ConditionFunc
	, typename ItFunc, typename Func>
void For(InitFunc initFunc, ConditionFunc conditionFunc
	, ItFunc itFunc, Func func)
{
	initFunc();
	While(conditionFunc, [&]()
	{
		func();
		itFunc();
	});
}

int main()
{
	If([](){return 1 < 10;},[]()
	{
		cout << "1 is smaller than 10" << endl;
	}, []()
	{
		cout << "1 is not smaller than 10" << endl;
	});

	cout << endl;

	int i = 0;
	While([&](){return i<10;},[&]()
	{
		cout << i << endl;
		i++;
	});

	cout << endl;
	For([&](){i=0;},[&](){return i<10;},[&](){i++;},[&]()
	{
		cout << i << endl;
	});
}