!EnumsAndExhaustiveSwitchStatementsInC++

Enums and Exhaustive `switch` statements in C++ 

cast.cpp

Color color = static_cast<Color>(42);

compilation_warnings

enum.cpp:12:12: warning: enumeration value 'Yellow' not handled in switch [-Wswitch]
    switch(c) {
           ^
enum.cpp:12:12: note: add missing switch cases
    switch(c) {
           ^
enum.cpp:17:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]

convert.cpp

Color convertToColor(int c) {
    auto color = static_cast<Color>(c);
    switch(color) {
        case Color::Red:
        case Color::Green:
        case Color::Blue:
            return color;
    }
    throw std::runtime_error("Invalid color");
}

example.cpp

#include <iostream>
#include <string>

enum class Color {
    Red,
    Green,
    Blue,
};

std::string getColorName(Color c) {
    switch(c) {
        case Color::Red: return "red";
        case Color::Green: return "green";
        case Color::Blue: return "blue";
    }
}

int main() {
    std::cout << "Color: " << getColorName(Color::Green) << std::endl;
    return 0;
}

updated_enum.cpp

enum class Color {
    Red,
    Green,
    Blue,
    Yellow,
};