#include <iostream>
#include <string>
 
struct Foo
{
    Foo& operator= (bool value) {std::cout << "bool\n"; return *this;}
    Foo& operator= (const std::string& value) {std::cout << "string\n"; return *this;}
};
 
int main() {
   Foo foo;
   foo = true; // works...assigned as bool
   foo = "i_am_a_string"; // SURPRISE...assigned as bool, not string
   std::string s = "i_am_a_string"; 
   foo = s; // works...assigned as string
   foo = static_cast<std::string>("i_am_a_string"); // works...but awkward
}

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