#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
 
template<class T> struct __arr_contains
{
	const T& container;
	__arr_contains(const T& c) : container(c) {}
};
 
template<class T, class V> bool operator+(V&& val, __arr_contains<T> c)
{
	return std::find(c.container.begin(), c.container.end(), val)
	            != c.container.end();
}
 
struct __arr_check
{
	__arr_check() {}
	template<class T> __arr_contains<T> operator*(const T& arr)
	{ return __arr_contains<T>(arr);	}
};
 
#define in +__arr_check()*
 
int main() {
	vector<int> v{ 1,2,3,4,5 };
	if (3 in v)
	{
		cout << "yep";
	}
	else
		cout << "nope";
	return 0;
}

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