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#include <stdint.h>
#include <iostream>
#include <limits>
#include <type_traits>
 
enum class Color: uint32_t{ red, green, blue, orange=0xFFFFFFFF };
 
int main(){
    Color g = Color::green;
    static_assert(std::underlying_type_t<Color>(Color::green) <= std::numeric_limits<uint8_t>::max(), "Green overflows!");
    auto gg = static_cast<uint8_t>(g);
 
    Color f = Color::orange;
    static_assert(std::underlying_type_t<Color>(Color::orange) <= std::numeric_limits<uint8_t>::max(), "Orange overflows!");
    auto ff = static_cast<uint8_t>(f);
 
    printf("Casted value of red: 0x%x\n", gg);
    printf("Casted value of orange: 0x%x\n", ff);
 
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:14:64: error: static assertion failed: Orange overflows!
     static_assert(std::underlying_type_t<Color>(Color::orange) <= std::numeric_limits<uint8_t>::max(), "Orange overflows!");
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard output is empty