Ambiguous use of the overloaded function std::string to_string(int val); by Сыроежка

The function std::string to_string(int val); does not declared for the fundamental type int. So the compiler issues errors that the use of the function is ambiguous. Header <string> contains the following declarations

inline string to_string(_Longlong _Val);
inline string to_string(_ULonglong _Val);
inline string to_string(long double _Val);

where _Longlong and _ULonglong are defined as

#define _LONGLONG    __int64
#define _ULONGLONG    unsigned __int64

So then there is a call

int x = 42;

std::string s = to_string( x );

the compiler issues errors.