!Enum, C++ (vc++) - rextester

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​x
 
//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64
​
#include <iostream>
​
int main()
{
    enum {
        A = 1
    } MyEnum;
    
    std::cout << (0xFF) << std::endl;
    
    std::cout << (0xFF & !A) << std::endl;
    
    std::cout << (0xFF & ~A) << std::endl;
}

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Compilation time: 1,84 sec, absolute running time: 0,33 sec, absolute service time: 2,18 sec