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#include <string> is required

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Compilation time: 1,4 sec, absolute service time: 1,43 sec 
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Error(s):
source_file.cpp(8): error C2679: binary '<<': no operator found which takes a right-hand operand of type 'const std::string' (or there is no acceptable conversion)
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(497): note: could be 'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::basic_streambuf<char,std::char_traits<char>> *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(477): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(const void *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(457): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(long double)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(437): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(double)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(417): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(float)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(396): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned __int64)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(376): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(__int64)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(355): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned long)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(335): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(long)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(315): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned int)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(290): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(int)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(270): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned short)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(236): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(short)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(216): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(bool)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(209): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(202): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::basic_ios<char,std::char_traits<char>> &(__cdecl *)(std::basic_ios<char,std::char_traits<char>> &))'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(196): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::basic_ostream<char,std::char_traits<char>> &(__cdecl *)(std::basic_ostream<char,std::char_traits<char>> &))'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(694): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const char *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(741): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(779): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const char *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(826): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(952): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const signed char *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(959): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,signed char)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(966): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const unsigned char *)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(973): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,unsigned char)'
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(983): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>,std::string>(std::basic_ostream<char,std::char_traits<char>> &&,const _Ty &)'
        with
        [
            _Ty=std::string
        ]
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\ostream(1021): note: or       'std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const std::error_code &)'
source_file.cpp(8): note: while trying to match the argument list '(std::ostream, const std::string)'
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64


        

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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