ostringstream和复制构造函数的问题 | ostringstream和复制构造函数的问题

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问题描述

编译类T失败，原因是Visual C ++和GCC产生iostreams模板错误。以下是代码：

Compiling class T fails with Visual C++ and GCC producing iostreams template errors. Here is the code:

#include <sstream>

class T
{
  static T copy;

  std::ostringstream log;

  T()            {}
  T(const T& t)  {log  = t.log;}
  ~T()           {copy = *this;}
};

T T::copy;

将 log 数据成员类型更改为字符串可以使其编译并运行正常。这是合法行为吗？

Changing log data member type to string makes it compile and run OK. Is this a legitimate behavior?

推荐答案

已经对C ++中的任何流类进行了复制构造函数和复制分配私人。这意味着，您无法复制 std :: ostringstream 对象：

Copy constructor and copy-assignment of any stream class in C++ has been made private. That means, you cannot make copy of std::ostringstream object:

std::ostringstream ss;

std::ostringstream ss1(ss); //not allowed - copy-constructor is private
ss1=ss; //not allowed - copy-assignment is private

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