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#include <iostream>
#include <string>
 
using namespace std;
 
double stod( const std::string& str, std::size_t* pos = 0 ) { std::cout << "Oops"; }
 
int main() {
	const std::string a("1.2");
	std::cout << stod(a) << std::endl;
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:10:21: error: call of overloaded 'stod(const string&)' is ambiguous
  std::cout << stod(a) << std::endl;
                     ^
prog.cpp:6:8: note: candidate: double stod(const string&, std::size_t*)
 double stod( const std::string& str, std::size_t* pos = 0 ) { std::cout << "Oops"; }
        ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:5286:3: note: candidate: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^

Standard output is empty