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#include <iostream>
using namespace std;
 
enum EnumFirst {
	Foo,
	Bar
};
 
enum EnumSecond {
	Foo2,
	Bar2,
	Baz2
};
 
const char *toString(EnumFirst val)
{
	switch (val) {
		case EnumFirst::Foo:
			return "Foo";
		case EnumFirst::Bar:
			return "Bar";
	}
	return "Unknown";
}
 
const char *toString(EnumSecond val)
{
	switch (val) {
		case EnumSecond::Foo2:
			return "Foo2";
		case EnumSecond::Bar2:
			return "Bar2";
		case EnumSecond::Baz2:
			return "Baz2";
	}
	return "Unknown";
 
}
 
int main() {
 
	int v = 1;
	EnumFirst a = v; // static_cast ?)
	EnumSecond b = v;
	cout << toString(a) << endl;
	cout << toString(b) << endl;
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:43:16: error: invalid conversion from ‘int’ to ‘EnumFirst’ [-fpermissive]
  EnumFirst a = v; // static_cast ?)
                ^
prog.cpp:44:17: error: invalid conversion from ‘int’ to ‘EnumSecond’ [-fpermissive]
  EnumSecond b = v;
                 ^

Standard output is empty