#include <iostream>

enum class myEnum : int
{
    A, B, C,
};

class foo
{
public:
    int field;
};

int main( int argc, char** argv )
{
    foo arr[] = { 100, 200, 400 };

    int a = arr[ 0 ].field; // OK
    int b = arr[ (int) myEnum::A  ].field; // OK

    int c = arr[ static_cast<int>(myEnum::A) ].field; //  field highlighted as unable to resolve 
    int d = arr[ static_cast<int>(0) ].field;         //  field highlighted as unable to resolve

    std::cout << a << " " << b << " " << c << " " << d << std::endl;

    return 0;
}

This is C++11 code, but thing like this "int d = arr[ static_cast<int>(0) ].field;" don't work aslo in c++98.

Ubuntu 13.10 x64.
g++ version 4.8.1