#include <iostream>
#include <map>
 
namespace Errs {
    enum Errs {
        ERR_TEST1 = 0,
        ERR_TEST2,
        ERR_TEST3
    };
}
 
 
class PrtsErrs {
private:
    const std::map<Errs::Errs, std::string> errStr {
        { Errs::Errs::ERR_TEST1, "ERR_TEST1" },
        { Errs::Errs::ERR_TEST2, "ERR_TEST2" },
        { Errs::Errs::ERR_TEST3, "ERR_TEST3" }
    };
public:
    std::string GetErrStr(Errs::Errs errCode) const 
    { 
        return errStr.at(errCode);
    }
} ;
 
int main() 
{
    PrtsErrs foo ; 
    std::cout << foo.GetErrStr(Errs::Errs::ERR_TEST2) << std::endl ;
    return 0;
}

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