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#include <iostream>
#include <initializer_list>
 
using namespace std;
 
class Widget{
public:
    Widget(initializer_list<double> list){ cout << "co"; } // #1  
    Widget(initializer_list<string> list){ cout << "xd"; } // #2
  }; 
   int main(){
    Widget w ({});
 
    return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:12:17: error: call of overloaded 'Widget(<brace-enclosed initializer list>)' is ambiguous
     Widget w ({});
                 ^
prog.cpp:9:5: note: candidate: Widget::Widget(std::initializer_list<std::basic_string<char> >)
     Widget(initializer_list<string> list){ cout << "xd"; } // #2
     ^
prog.cpp:8:5: note: candidate: Widget::Widget(std::initializer_list<double>)
     Widget(initializer_list<double> list){ cout << "co"; } // #1  
     ^
prog.cpp:6:7: note: candidate: constexpr Widget::Widget(const Widget&)
 class Widget{
       ^
prog.cpp:6:7: note: candidate: constexpr Widget::Widget(Widget&&)

Standard output is empty