在“ std :: operator”中与“ operator<<”不匹配 [英] no match for ‘operator<<’ in ‘std::operator
本文介绍了在“ std :: operator”中与“ operator<<”不匹配的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是C ++新手。我在这里尝试了我的第一个程序。在我看来，这个程序是正确的。
＃包括< iostream>
使用命名空间std;
class mystruct
{
private：
int m_a;
float m_b;
public：
mystruct（int x，float y）
{
m_a = x;
m_b = y;
}
};
int main（）
{
mystruct m = mystruct（5,3.14）;
cout<< 我的结构<< m<<恩德尔
返回0;
}
但是我遇到了很多错误。为什么不知道为什么？
cout.cpp：在函数'int main（）'中：
cout.cpp：26：29：错误：在'std :: operator<<中没有匹配'operator<<' [[_Traits = std :: char_traits< char>]]（（（*& std :: cout），（（const char *） my structure））<< m'
cout.cpp：26：29：注意：候选者是：
/usr/include/c++/4.6/ostream:110:7：注意：std :: basic_ostream< _CharT，_Traits> ;: ：__ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（std :: basic_ostream< _CharT，_Traits> :: __ ostream_type&（*）（std :: basic_ostream< _CharT，_：Traits&） _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits> :: __ ostream_type = std :: basic_ostream< char>]
/usr/include/c++/4.6/ostream： 110：7：注意：参数1没有从'mystruct'到'std :: basic_ostream< char> :: __ ostream_type&的已知转换。 （*）（std :: basic_ostream< char> :: __ ostream_type&）{aka std :: basic_ostream< char> （*）（std :: basic_ostream< char>&）}’
/usr/include/c++/4.6/ostream:119:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<（（std :: basic_ostream< _CharT，_Traits> :: __ ios_type&（*）（std :: basic_ostream< _CharT，_Traits）&:: _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits> :: __ ostream_type = std :: basic_ostream< char> ;, std :: basic_ostream<：_CharT，_T： ：basic_ios< char>]
/usr/include/c++/4.6/ostream:119:7：注意：未知参数1从'mystruct'到'std :: basic_ostream< char> :: __ ios_type&的转换（*）（std :: basic_ostream< char> :: __ ios_type&）{aka std :: basic_ios< char> （*）（std :: basic_ios< char>&）}’
/usr/include/c++/4.6/ostream:129:7：注意：std :: basic_ostream< _CharT，_Traits> :: ____ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<（std :: ios_base&（*）（std :: ios_base&）） ：basic_ostream< _CharT，_Traits> :: __ ostream_type = std :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:129:7：注意：'mystruct'中参数1的未知转换到'std :: ios_base& （*）（std :: ios_base&）’
/usr/include/c++/4.6/ostream:167:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（long int）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type :: __ ：basic_ostream< char>]
/usr/include/c++/4.6/ostream:167:7：注意：参数1从'mystruct'到'long int'的未知转换
/ usr / include /c++/4.6/ostream:171:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（long unsigned int）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type： :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:171:7：注意：参数1从'mystruct'到'long unsigned int'
/ usr的未知转换/include/c++/4.6/ostream:175:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（bool）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type ::: ____ basic_ostream< char>]
/usr/include/c++/4.6/ostream:175:7：注意：参数1没有从'mystruct'到'bool'的已知转换
/ usr / include / c ++ /4.6/bits/ostream.tcc:93:5：注意：std :: basic_ostream< _CharT，_Traits& std :: basic_ostream< _CharT，_Traits> :: operator<<（short int）[with _CharT = char，_Traits = std :: char_traits< char>]
/usr/include/c++/4.6/bits/ ostream.tcc：93：5：注意：参数1没有从'mystruct'到'short int'的已知转换
/usr/include/c++/4.6/ostream:182:7：注意：std :: basic_ostream< ; _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（短无符号整数）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type： :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:182:7：注意：参数1从'mystruct'到'short unsigned int'
/ usr的未知转换/include/c++/4.6/bits/ostream.tcc:107:5：注意：std :: basic_ostream< _CharT，_Traits& std :: basic_ostream< _CharT，_Traits> :: operator<（int）[with _CharT = char，_Traits = std :: char_traits< char>]
/usr/include/c++/4.6/bits/ostream .tcc：107：5：注意：参数1没有从'mystruct'到'int'的已知转换
/usr/include/c++/4.6/ostream:193:7：注意：std :: basic_ostream&__ CharT ，_Traits> :: ____ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<（unsigned int）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&d = :: ：basic_ostream< char>]
/usr/include/c++/4.6/ostream:193:7：注意：参数1没有从'mystruct'到'unsigned int'的已知转换
/ usr / include /c++/4.6/ostream:202:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（long long int）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&d =： :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:202:7：注意：参数1从'mystruct'到'long long int'的未知转换
/ usr /include/c++/4.6/ostream:206:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（long long unsigned int）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_：Traits> std :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:206:7：注意：参数1从'mystruct'到'long long unsigned int'
的未知转换/usr/include/c++/4.6/ostream:211:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（double）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits_type = :: __ ostream basic_ostream< char>]
/usr/include/c++/4.6/ostream:211:7：注意：参数1从'mystruct'到'double'的未知转换
/ usr / include / c ++ /4.6/ostream:215:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（float）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type :: __ basic_ostream< char>]
/usr/include/c++/4.6/ostream:215:7：注意：参数1从'mystruct'到'float'的未知转换
/ usr / include / c ++ /4.6/ostream:223:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（long double）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type = :: ____ ：basic_ostream< char>]
/usr/include/c++/4.6/ostream:223:7：注意：未知参数1从'mystruct'到'long double'的转换
/ usr / include /c++/4.6/ostream:227:7：注意：std :: basic_ostream< _CharT，_Traits> :: __ ostream_type& std :: basic_ostream< _CharT，_Traits> :: operator<<（const void *）[with _CharT = char，_Traits = std :: char_traits< char> ;, std :: basic_ostream< _CharT，_Traits&type =：__ :: basic_ostream< char>]
/usr/include/c++/4.6/ostream:227:7：注意：参数1从'mystruct'到'const void *'的未知转换
/ usr /include/c++/4.6/bits/ostream.tcc:121:5：注意：std :: basic_ostream< _CharT，_Traits& std :: basic_ostream< _CharT，_Traits> :: operator<（std :: basic_ostream< _CharT，_Traits> :: __ streambuf_type *）[with _CharT = char，_Traits = std :: char_traits< char< char ; _CharT，_Traits> :: __ streambuf_type = std :: basic_streambuf< char>]
/usr/include/c++/4.6/bits/ostream.tcc:121:5：注意：对于' mystruct'为'std :: basic_ostream< char> :: __ streambuf_type * {aka std :: basic_streambuf< char> *}''
/usr/include/c++/4.6/bits/basic_string.h:2693:5：注意：template< class _CharT，class _Traits，class _Alloc> std :: basic_ostream< _CharT，_Traits>& std :: operator<（（std :: basic_ostream< _CharT，_Traits>& ;, const std :: basic_string< _CharT，_Traits，_Alloc>&）
/usr/include/c++/4.6/ostream： 451：5：注意：template< class _CharT，class _Traits> std :: basic_ostream< _CharT，_Traits>& std :: operator<（（std :: basic_ostream< _CharT，_Traits>& ;, _CharT）
/usr/include/c++/4.6/ostream:456:5：注意：template< class _CharT，class _Traits> ; std :: basic_ostream< _CharT，_Traits>& std :: operator<（std :: basic_ostream< _CharT，_Traits& ;, char）
/usr/include/c++/4.6/ostream:462:5：注意：template< class _Traits> std :: basic_ostream< char，_Traits>& std :: operator<（std :: basic_ostream< char，_Traits& ;, char））
/usr/include/c++/4.6/ostream:468:5：注意：template< class _Traits> std :: basic_ostream< char，_Traits>& std :: operator<（std :: basic_ostream< char，_Traits& amp ;,带签名的char））
/usr/include/c++/4.6/ostream:473:5：注意：template< class _Traits> std :: basic_ostream< char，_Traits>& std :: operator<（std :: basic_ostream< char，_Traits& ;, unsigned char）
/usr/include/c++/4.6/ostream:493:5：注意：template< class _CharT，class _特质> std :: basic_ostream< _CharT，_Traits>& std :: operator<（（std :: basic_ostream< _CharT，_Traits>& ;, const _CharT *）
/usr/include/c++/4.6/bits/ostream.tcc:323:5：注意：模板< ; class _CharT，class _Traits> std :: basic_ostream< _CharT，_Traits>& std :: operator<<（std :: basic_ostream< _CharT，_Traits>& ;, const char *）
/usr/include/c++/4.6/ostream:510:5：注意：template< class _Traits> std :: basic_ostream< char，_Traits>& std :: operator<（std :: basic_ostream< char，_Traits& ;, const char *）
/usr/include/c++/4.6/ostream:523:5：注意：template< class _Traits> std :: basic_ostream< char，_Traits>& std :: operator <（std :: basic_ostream< char，_Traits& ;, constsigned char *）
/usr/include/c++/4.6/ostream:528:5：注意：template< class _Traits> ; std :: basic_ostream< char，_Traits>& std :: operator<<（std :: basic_ostream< char，_Traits>& ;, const unsigned char *）
对于 mystruct << >类
类似这样的东西：运算符<< （ostream& os，const mystruct& m）
{
os< m.m_a<<<< m.m_b<<恩德尔
return os;
}
请参见此处
I am a C++ newbie.I tried out my first program here.To my eyes this program is correct.
#include <iostream>
using namespace std;
class mystruct
{
private:
int m_a;
float m_b;
public:
mystruct(int x, float y)
{
m_a = x;
m_b = y;
}
};
int main()
{
mystruct m = mystruct(5,3.14);
cout << "my structure " << m << endl;
return 0;
}
However I am getting sooo many errors.Can't figure out why?
cout.cpp: In function ‘int main()’:
cout.cpp:26:29: error: no match for ‘operator<<’ in ‘std::operator<< [with _Traits = std::char_traits<char>]((* & std::cout), ((const char*)"my structure ")) << m’
cout.cpp:26:29: note: candidates are:
/usr/include/c++/4.6/ostream:110:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:110:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&) {aka std::basic_ostream<char>& (*)(std::basic_ostream<char>&)}’
/usr/include/c++/4.6/ostream:119:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>, std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]
/usr/include/c++/4.6/ostream:119:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}’
/usr/include/c++/4.6/ostream:129:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:129:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘std::ios_base& (*)(std::ios_base&)’
/usr/include/c++/4.6/ostream:167:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:167:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘long int’
/usr/include/c++/4.6/ostream:171:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:171:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘long unsigned int’
/usr/include/c++/4.6/ostream:175:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:175:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘bool’
/usr/include/c++/4.6/bits/ostream.tcc:93:5: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.6/bits/ostream.tcc:93:5: note: no known conversion for argument 1 from ‘mystruct’ to ‘short int’
/usr/include/c++/4.6/ostream:182:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:182:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘short unsigned int’
/usr/include/c++/4.6/bits/ostream.tcc:107:5: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.6/bits/ostream.tcc:107:5: note: no known conversion for argument 1 from ‘mystruct’ to ‘int’
/usr/include/c++/4.6/ostream:193:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:193:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘unsigned int’
/usr/include/c++/4.6/ostream:202:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:202:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘long long int’
/usr/include/c++/4.6/ostream:206:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:206:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘long long unsigned int’
/usr/include/c++/4.6/ostream:211:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:211:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘double’
/usr/include/c++/4.6/ostream:215:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:215:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘float’
/usr/include/c++/4.6/ostream:223:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:223:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘long double’
/usr/include/c++/4.6/ostream:227:7: note: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
/usr/include/c++/4.6/ostream:227:7: note: no known conversion for argument 1 from ‘mystruct’ to ‘const void*’
/usr/include/c++/4.6/bits/ostream.tcc:121:5: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_ostream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]
/usr/include/c++/4.6/bits/ostream.tcc:121:5: note: no known conversion for argument 1 from ‘mystruct’ to ‘std::basic_ostream<char>::__streambuf_type* {aka std::basic_streambuf<char>*}’
/usr/include/c++/4.6/bits/basic_string.h:2693:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
/usr/include/c++/4.6/ostream:451:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
/usr/include/c++/4.6/ostream:456:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
/usr/include/c++/4.6/ostream:462:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
/usr/include/c++/4.6/ostream:468:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
/usr/include/c++/4.6/ostream:473:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
/usr/include/c++/4.6/ostream:493:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
/usr/include/c++/4.6/bits/ostream.tcc:323:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
/usr/include/c++/4.6/ostream:510:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
/usr/include/c++/4.6/ostream:523:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
/usr/include/c++/4.6/ostream:528:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
解决方案
You need to overload operator << for mystruct class
Something like :-
friend ostream& operator << (ostream& os, const mystruct& m)
{
os << m.m_a <<" " << m.m_b << endl;
return os ;
}
See here
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