C++ Simple cout ostream

C++ Simple cout ostream

本文关键字:ostream cout Simple C++      更新时间:2023-10-16
#include"MyString.h"
#include<iostream>
    MyString::MyString()//default constructor
    {
        length=0;
        data=NULL;
        cout<<"Default called by right none is called"<<endl;
        system("pause");
    }
    MyString::MyString(char *source)//cstyle string parameter
    {
        int counter=0;
        //we implement count without using getlen
        for(int i=0;(source[i])!='';i++)//assume their char string is terminated by null
        {
            counter++;
        }
        length=counter;
        cout<<"THE LENGTH of "<<source<<" is "<<counter<<endl;
        system("pause");
        data = new char[length];
    }
    void MyString::print(ostream a)//what to put in besides ostream
    {
        a<<data;
    }

以上是在我的实现文件中

这是我的主文件

 int main()
 {
    MyString s1("abcd");// constructor with cstyle style array
    s1.print(cout);
    system("pause");
    return 0;
 }

为什么这行不通?我收到此错误

错误 C2248:"std::basic_ios<_Elem,_Traits>::basic_ios":无法访问类"std::basic_ios<_Elem,_Traits>"中声明的私有成员

百万感谢!错误已修复!!

你不能复制std::coutstd::cinstd::cerr 或任何其他派生自std::ios_base的对象,因为该对象的复制构造函数是私有的......必须通过引用传递从ios_base派生的所有流对象,以防止调用复制构造函数。因此,您的函数签名:

void MyString::print(ostream a);

至少需要更改为

void MyString::print(ostream& a);

原因是对print的调用尝试复制输出流,这是不允许的。您已更改函数以将参数作为参考:

void MyString::print(ostream &a)