error: ‘std::ios_base::ios_base(const std::ios_base&)’ is private ios_base(const ios_base&); synthesized method ‘std::basic_ostream<char>::basic_ostream(const std::basic_ostream<char>&)’ first required here

来源：清泛原创     2016-10-24 17:42:08    人气：     我有话说( 0 人参与)

这个错误的原因大概是std::ios_base类的拷贝构造函数是私有的，从return s语句返回时缺少一个合成的构造拷贝构造函数完成流的复制。错误代...

#include <iostream>
#include <string>

struct Person {
   std::string name;
   Person(std::string n):name(n){}
};
// should return a reference to std::ostream
std::ostream operator<<(std::ostream& s,const Person &p) {
  s << p.name;
  return s;
}

int main() {
   Person p(std::string("Tom"));
   std::cout<<p<<std::endl;
}

ostream

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