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#include <map>
#include <string>
#include <iostream>
 
using namespace std;
 
enum class ID_Color {
	RED, BLUE, WHITE
};
 
inline string Foo(ID_Color color){
    static const map<ID_Color, string> colorsMap = { 
        {ID_Color::RED, "czerwony"}, {ID_Color::BLUE, "niebieski"}, {ID_Color::WHITE, "biały"}
    };
    return colorsMap.at(color);
}
 
int main(){
	cout << Foo(ID_Color::RED) << endl;
	return 0;
}

prog.cpp: In function 'std::string Foo(ID_Color)':
prog.cpp:12:18: error: 'unordered_map' does not name a type
     static const unordered_map<ID_Color, string> colorsMap = { 
                  ^
prog.cpp:15:12: error: 'colorsMap' was not declared in this scope
     return colorsMap.at(color);
            ^

Standard output is empty