- template<typename T, typename U>   
- auto max(T x, U y) -> decltype(x > y ? x : y)   
- { return x > y ? x : y; } 
-   
- #include <iostream> 
- int main() { 
- 	char x = 15; 
- 	unsigned long long y = 4; 
- 	auto result = max(x, y); 
- 	::std::cout << result << "\n"; 
- } 
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