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#include <string>
struct Bob
	{
		template<class T>
		void operator () () const
		{
			T t;
		}
 
		template<class T>
		operator T () const
		{
			T t;
			return t;
		}
	};
 
    int main()
    {
	Bob b;
	std::string s = static_cast<std::string>(b);
    }

prog.cpp: In function ‘int main()’:
prog.cpp:21:44: error: call of overloaded ‘basic_string(Bob&)’ is ambiguous
  std::string s = static_cast<std::string>(b);
                                            ^
prog.cpp:21:44: note: candidates are:
In file included from /usr/include/c++/4.8/string:52:0,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:522:7: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc());
       ^
/usr/include/c++/4.8/bits/basic_string.h:507:7: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(basic_string&& __str) noexcept
       ^
/usr/include/c++/4.8/bits/basic_string.h:490:7: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
       ^
/usr/include/c++/4.8/bits/basic_string.h:455:7: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const basic_string& __str);
       ^
/usr/include/c++/4.8/bits/basic_string.h:448:7: note: std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const _Alloc& __a);
       ^

Standard output is empty