无法编译c ++代码,因为ifstream不可访问

Question

    //**************************************************************************************************************
// FILE: a04.cpp
//**************************************************************************************************************
#include <fstream>
#include <iostream>
#include "Sorter.hpp"
using namespace std;
// Write the function header for Merge ()
void Merge(int a[] , int b[],int c[], int n)
{
    int i = 0, j = 0, k = 0;
    while (i < n || j < n) {
        // Write the if-elseif-elseif-... statement in the body of the while loop
        if (i < n  && j < n && a<=b) {
                c = a;
                i++;
        }
        else if (i < n && j < n && a > b) {
            c =b;
            j++;
        }
        else if (i < n) {
            c = a;
            i++;
        }
        else {
            c =b;
            j++;
        }
        k++;
    } // end while
} // end function merge

void ReadList(ifstream fin, int a[], int n);

void ReadFile(int a[], int b[], int& n)
{
    ifstream fin ("ints-in.txt");
    ReadList(fin,a,n); // come back again different than the psuedo code
    ReadList(fin,b,n);
    fin.close();
} 


// Write the function header for ReadList()
void ReadList(ifstream fin, int a[], int n)
{
    n = 0;
    int number;
    // Implement the sentinel loop
    while (fin >> number && number != -1) {
        a[n] = number;
        n++; // come back again
    }
}


void WriteFile(int a[], int n)
{
    ofstream fout("ints-out.txt");
    // Write a vary loop where variable ivaries from 0 to n - 1. In the loop send a[i] and ' ' to fout.
    for (int i =0; i <= n-1; i++) {
        fout << a << ' '; // come back again.
    }
    fout << -1;
    fout.close();
}


int main()
{
// Define int arrays a,b, and c and int variable n.
int a[100], b[100], c[200];
int n;

// Call ReadFile () passing a,b, and n
ReadFile(a,b,n);

// Define and create a Sorter object named sorter
Sorter sorter;
// Call SelectionSort() on sorter to sort a into ascending order.
// Hint: to access the ASCENDING constant data member of the Sorter class you write Sorter::ASCENDING.
sorter.SelectionSort(a,100,Sorter::ASCENDING); //come back again here.

// Call BubbleSort () on sorter to sort b into ascending order
sorter.BubbleSort(b,100,Sorter::ASCENDING);
// Call Merge() passing a,b,c, and n
Merge(a,b,c,n);
// Call WriteFile () passing c and 2n
WriteFile(c,2*n);

return 0;
} 

我不知道为什么它无法编译.

错误1错误C2248:'std :: basic_ifstream <_Elem,_Traits> :: basic_ifstream':无法访问类'std :: basic_ifstream <_Elem,_Traits>'c:\ users\hisham\documents\visual studio 2012中声明的私有成员\ projects\homework4\a04.cpp 39 1 Homework4错误2错误C2248:'std :: basic_ifstream <_Elem,_Traits> :: basic_ifstream':无法访问类'std :: basic_ifstream <_Elem,_Traits>'c中声明的私有成员:\ users\hisham\documents\visual studio 2012\projects\homework4\a04.cpp 40 1 Homework4 3 IntelliSense:"std :: basic_ifstream <_Elem,_Traits> :: basic_ifstream(const std :: basic_ifstream <_Elem,_Traits>: :_Myt&_Right)[with _Elem = char,_Traits = std :: char_traits]"(在"C:\ Program Files(x86)\ Microsoft Visual Studio 11.0\VC\include\fstream"的第827行声明)无法访问c:\Users\Hisham\Documents\Visual Studio 2012\Projects\Homework4\a04.cpp 39 11 Homework4 4 IntelliSense:"std :: basic_ifstream <_Elem,_Traits> :: basic_ifstream(const std :: basic_ifstream <_Elem,_Traits> :: _Myt&_Right)[有 _Elem =字符,_Traits =的std :: char_traits]"(在827行申报的 "C:\ Program Files文件(x86)的\微软的Visual Studio 11.0\VC\\包括fstream的")是无法访问C:\用户\希沙姆\文件\ Visual Studio 2012\Projects\Homework4\a04.cpp 40 11作业4

谢谢.

Answer 1

该错误并未说ifstream是无法访问的.它(以其自己的复杂方式)说复制构造函数是不可访问的,因为它被声明为私有.问题是你正在通过ifstream值传递,它试图调用不可访问的复制构造函数.

void ReadList(ifstream fin, int a[], int n)

通过引用传递它.

void ReadList(ifstream & fin, int a[], int n)