在C ++中无法访问std :: basic_ostream [英] std::basic_ostream is inaccessible in C++

问题描述

我收到以下错误，我不确定是什么问题

I get the following error and I'm not sure what the issue is

1 IntelliSense： std :: basic_ostream&__ Elem ，
_Traits> :: basic_ostream（const std :: basic_ostream< _Elem，_Traits>：__ Myt& _Right）[with _Elem = char，_Traits = std :: char_traits]（在行中声明
C：\Program Files（x86）\Microsoft Visual Studio
11.0\VC\include\ostream中的82无法访问

1 IntelliSense: "std::basic_ostream<_Elem, _Traits>::basic_ostream(const std::basic_ostream<_Elem, _Traits>::_Myt &_Right) [with _Elem=char, _Traits=std::char_traits]" (declared at line 82 of "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\ostream") is inaccessible

Book.cpp

ostream operator<< (ostream& out, const Book & b){
    out << "Title: " << b.my_Title << endl;
    out << "Author: " << b.my_Author << endl;
    out << "Number of time checkout out: " << b.my_NumberOfTimesCheckedOut;
    return(out);
}

我遇到了 return（out）问题;

Book.h

#ifndef BOOK_H
#define BOOK_H
#include <string>
using namespace std;
namespace CS20A
{
    class Book {
    public:
        Book();
        Book( string author, string title );
        string getTitle() const;
        string getAuthor() const;
        int getNumberOfTimesCheckedOut() const;
        void increaseNumberOfTimesCheckedOut( int amount=1 );
        friend ostream operator<< ( ostream& out, const Book & b );
    private:
        string my_Author;
        string my_Title;
        int my_NumberOfTimesCheckedOut;
    };
};
#endif

我什至不知道错误告诉我什么

I don't even understand what the error is telling me

推荐答案

我怀疑您使用的是古老的编译器，该编译器禁止复制 std :: ostream ，不可复制，方法是将其复制构造函数设为私有；因此，令人困惑的无法访问错误。

I suspect that you're using an ancient compiler that implements a prohibition on copying std::ostream, which is not copyable, by making its copy-constructor private; hence the confusing "inaccessible" error.

std :: ostream 是不可复制的。您必须返回引用：

std::ostream is not copyable. You must return a reference:

ostream &operator<< (ostream& out, const Book & b){

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