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View Compilation Error

0_0_39607696_4.cpp
0_0_39607696_4.cpp(50) : error C2679: 二进制“<<”: 没有找到接受“std::string”类型的右操作数的运算符(或没有可接受的转换)
        VC2013\INCLUDE\ostream(498): 可能是“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>> *)”
        VC2013\INCLUDE\ostream(478): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(const void *)”
        VC2013\INCLUDE\ostream(458): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(long double)”
        VC2013\INCLUDE\ostream(438): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(double)”
        VC2013\INCLUDE\ostream(418): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(float)”
        VC2013\INCLUDE\ostream(397): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned __int64)”
        VC2013\INCLUDE\ostream(377): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(__int64)”
        VC2013\INCLUDE\ostream(356): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned long)”
        VC2013\INCLUDE\ostream(336): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(long)”
        VC2013\INCLUDE\ostream(316): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned int)”
        VC2013\INCLUDE\ostream(291): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(int)”
        VC2013\INCLUDE\ostream(271): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(unsigned short)”
        VC2013\INCLUDE\ostream(237): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(short)”
        VC2013\INCLUDE\ostream(217): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::_Bool)”
        VC2013\INCLUDE\ostream(210): 或       “std::basic_ostream<char,std::char_traits<char>> &std::basic_ostream<char,std::char_traits<char>>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))”
        VC2013\INCLUDE\ostream(203): 或       “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>> &))”
        VC2013\INCLUDE\ostream(197): 或       “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>> &))”
        VC2013\INCLUDE\ostream(1026): 或       “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 &)”
        VC2013\INCLUDE\ostream(988): 或       “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
        ]
        VC2013\INCLUDE\ostream(978): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,unsigned char)”
        VC2013\INCLUDE\ostream(971): 或       “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 *)”
        VC2013\INCLUDE\ostream(964): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,signed char)”
        VC2013\INCLUDE\ostream(957): 或       “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 *)”
        VC2013\INCLUDE\ostream(831): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)”
        VC2013\INCLUDE\ostream(784): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,const char *)”
        VC2013\INCLUDE\ostream(746): 或       “std::basic_ostream<char,std::char_traits<char>> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<char,std::char_traits<char>> &,char)”
        VC2013\INCLUDE\ostream(699): 或       “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 *)”
        尝试匹配参数列表“(std::ostream, std::string)”时


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